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Denise Boncioli (University of L'Aquila and INFN-LNGS)Talk
In its Phase I, the Pierre Auger Observatory has led to several observations, driving the field of ultra-high-energy cosmic ray (UHECR) research over the last 20 years. Major achievements obtained so far include the unprecedented precise energy spectrum and its features, the observables linked to the UHECR mass composition and the distribution of arrival directions of the most energetic...
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Jakub Vícha (FZU - Institute of Physics of the Czech Academy of Sciences)Poster
Assuming an extreme scenario, in which the arriving cosmic rays are composed of only iron nuclei at energies above 10$^{19.6}$ eV, and preserving the elongation rate predicted by models of hadronic interactions, we derive the shift of the scale of the depth of shower maximum (Xmax) predicted by these models using the public data from the Pierre Auger Observatory. We then propose a new...
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Luigi Lavitola (INFN Napoli)Poster
The SWGO collaboration is proposing a wide field of view observatory to explore the Southern hemisphere gamma ray sky in the 100 GeV-1 PeV energy range. The selected site is the Atacama Astronomical Park in Chile. SWGO will be the first wide field of view experiment in the observing the southern sky, complementing the observations of HAWC and LHAASO that operate the Northern hemisphere.
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The... -
Ana Laura Müller (FZU - Institute of Physics of the Czech Academy of Sciences)Poster
The origin of ultra-high-energy cosmic rays (UHECRs) remains a major open question in astrophysics. Observational data suggest that starburst galaxies and active galactic nuclei (AGNs) are the most promising sources. However, accelerating particles to energies above 1 EeV in these environments is complex due to the demanding requirements on energy, density, and metallicity imposed by...
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Takashi Sako (ICRR, University of Tokyo)Poster
Though the maximum energy of the charged cosmic ray observations exceeds 100EeV, the energy frontier of the gamma-ray observations is PeV. In the past years, Tibet ASgamma, HAWC and LHAASO opened a new window of astronomy in the sub-PeV to PeV range, which is important to unveil yet unknown PeV cosmic accelerators in our galaxy. As they are all located in the northern hemisphere, observations...
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Lorenzo Apollonio (Unimi & INFN-Milano)Poster
The origin of Ultra-High-Energy Cosmic Rays (UHECRs) is one of the biggest mysteries in modern astrophysics.
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Since UHECRs are deflected by Galactic and Extra-Galactic magnetic fields, their arrival directions do not point to their sources. Previous analyses conducted on the arrival directions of high energy events ($E>32\,\text{EeV}$) recorded by the Surface Detector of the Pierre Auger... -
Chisato Koyama (ICRR, The University of Tokyo)Poster
The TA×4 experiment, which has been ongoing since a portion of the detectors were newly installed in 2019, aims to reveal the origin of UHECRs by expanding the detection area of the TA experiment by a factor of four and increasing the number of observed events. In the analysis with the surface detector (SD) of the TA×4 experiment, the reconstruction method has already been established for...
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Alexander Elsenhans (KIT)Poster
ANDESPix is a digital silicon photomultiplier (SiPM) ASIC designed to
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readout scintillating fibers with low light intensity, as part of a muon detector, following the same muon detection principle used for muon detectors at the Pierre Auger Observatory.
Thereby, photons should be detected with very high time resolution (<100 ps) in order to identify impinging muons and their time of arrival... -
Keito Watanabe (Karlsruhe Institute of Technology)Talk
The field of ultra-high-energy cosmic ray (UHECR) astronomy has been facing an ongoing challenge due to the unknown impact of magnetic deflections on the observed events. However, with the recent successes in employing deep neural networks (DNN) to reconstruct data from multiple types of surface detectors, the wider availability of mass-sensitive datasets is expected to arrive within the next...
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Antonio Ambrosone (Gran Sasso Science Institute and INFN Laboratori Nazionali del Gran Sasso)Talk
Star-forming environments such as star-forming and Starburst Galaxies (SFGs and SBGs) experience intense phases of stellar formation activity. The Fermi-LAT collaboration has found a correlation between the gamma-ray and infrared luminosities for a sample of local SFGs and SBGs. Yet, the nature of CR transport inside these sources is still under debate. In this talk, I will discuss novel and...
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Alena Bakalova (FZU - Institute of Physics of the Czech Academy of Sciences)Poster
The arrival directions of cosmic rays are significantly influenced by the Galactic and and extragalactic magnetic fields, especially for a heavy mass-composition of the primary particles. Following recent studies, we assume a heavy mass-composition of primary particles at the highest energies, pure iron nuclei above $10^{19.6}$ eV, and explore the arrival directions of such particles using the...
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Juan Manuel Gonzalez (CONICET)Talk
The Pierre Auger Observatory has measured the spectrum of ultra-high-energy cosmic rays (UHECRs) with unprecedented precision, as well as the distribution of the depths of the maximum of the shower development in the atmosphere, which provide a reliable estimator of the mass composition. The measurements above 0.7 EeV can be interpreted within a standard model assuming two populations of...
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David Schmidt (Karlsruhe Institute of Technology (KIT))Talk
With the knowledge and statistical power derived from two decades of measurements, the Pierre Auger Observatory has significantly advanced our understanding of ultra-high-energy cosmic rays whilst unearthing an increasingly complex astrophysical scenario and tensions with hadronic interaction models. The field now demands primary mass as an observable with an exposure that only the surface...
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Nadine Bourriche (Max Planck Institute for Physics)Poster
We use the reconstructed properties of the Amaterasu particle, the second-highest energy cosmic ray ever detected, to map out three-dimensional constraints on the location of its unknown source. We highlight possible astrophysical sources that are compatible with these regions and requirements. Among these, M82, a powerful starburst galaxy, stands out as a strong candidate due to its position...
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Paul Filip (IAP)Poster
The Pierre Auger Observatory is a hybrid detector designed to study cosmic rays of
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the highest energies. With the area of the detector array covering 3000 km2 and with
more than 20 years of runtime, it counts among the cosmic ray experiments with the
highest accumulated exposure worldwide. The Surface Detector (SD) consists of over
1600 autonomously operating... -
Takayuki Tomida (Academic Assembly School of Science and Technology Institute of Engineering, Shinshu University, Nagano, Nagano, Japan)Poster
Accurate calibration of the Telescope Array Fluorescence Detector (TA-FD) and the atmosphere is crucial for precise analysis of Ultra High Energy Cosmic Rays (UHECRs) using the atmospheric fluorescence method. This presentation focuses on two key aspects of calibration: the pointing direction of the TA-FD and the atmospheric transparency as measured by the Vertical Aerosol Optical Depth...
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Beatriz Garcia (ITeDA)Poster
The Pierre Auger Observatory has developed its activities in the field of education and dissemination of astrophysics and high-energy astroparticle physics since 1998, the year when the fundamental stone was installed. A permanent improvement of the tools used has been achieved. The innovations follows two ways: externally, in terms of the facilities for visitors, which are renewed...
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Alessandro Cermenati (Gran Sasso Science Institute (GSSI), INFN-Laboratori Nazionali del Gran Sasso (LNGS))Talk
Ultra High-Energy Cosmic Rays (UHECRs) are expected to interact extensively with the
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cosmic microwave background (CMB) and the extragalactic background light (EBL),
generating secondary particles such as gamma rays and neutrinos. These secondary
particles create a guaranteed diffuse background of photons in the GeV-TeV energy
range and neutrinos in the PeV-EeV range. Notably, while UHECRs... -
Ryo Higuchi (RIKEN), Telescope Array CollaborationPoster
There's a reported correlation between the arrival directions of ultra-high-energy cosmic rays (UHECRs) and nearby starburst galaxies (SBGs). Auger collaboration (2018, 2022) reported a ~4 sigma significance correlation with SBGs, and the Telescope Array (TA) experiment also shows consistent results (TA collaboration 2018). The effects of the magnetic field on UHECR flux would be mandatory to...
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Marvin GottowikTalk
CORSIKA 8 represents a significant update in the simulation of particle showers, building on the well-established foundation of CORSIKA 7. It has been entirely rewritten as a modular and modern C++ framework, addressing the limitations of its predecessor to provide a flexible platform designed to satisfy current and novel use cases. This allows for application beyond pure air-shower scenarios...
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Keitaro Fujita (Institute for Cosmic Ray Research, The University of Tokyo)Talk
We report on the cosmic ray mass composition measured by the Telescope Array Low-energy Extension (TALE) hybrid detector. The TALE detector began operations in 2017 with 10 high-elevation fluorescence telescopes and a surface detector (SD) array of 80 scintillation counters, including 40 with 400 m spacing and 40 with 600 m spacing. In 2023, we constructed a new array made up of 50 SDs with a...
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38. Data-driven method to quantify and correct the corner-clipping effect in segmented muon countersJoaquin de Jesus (ITeDA, KIT)Poster
Segmented muon detectors, such as the Underground Muon Detector (UMD) of the Pierre Auger Observatory, can suffer from overcounting due to inclined muons generating signals in two adjacent segments. This effect, known as corner-clipping, introduces a bias in the muon estimator that increases with the zenith angle. To correct for this, the common approach is to parameterize the bias as a...
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Alexey Yushkov (FZU - Institute of Physics of the Czech Academy of Sciences)Talk
The Pierre Auger Observatory (Auger) and the Telescope Array (TA), located, respectively, in the Southern and Northern hemispheres, are the largest ultra-high-energy cosmic ray (UHECR) observatories. The data sets of unprecedented statistics collected by the two observatories offer a unique opportunity to search for the differences between the UHECR properties in the mostly complementary sky...
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Kaoru Takahashi (ICRR, The University of Tokyo)Talk
The origins of Ultra High Energy Cosmic Rays (UHECRs) remain unclear. A significant difficulty in identifying their sources is the complex deflection of charged particles by galactic and intergalactic magnetic fields. Our goal is to detect high-energy neutrinos produced through interactions between UHECRs and matter near astrophysical objects, to help elucidate their origins. In this study, we...
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Vincent Pelgrims (IIHE, ULB (Brussels))Poster
On their journey from their sources to Earth, electrically-charged cosmic rays are deflected by magnetic fields.
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While small-scale magnetized structures have no impact on the propagation of ultra-high energy cosmic rays, they can have an impact on our reconstruction of the large-scale magnetic field obtained from synchrotron and Faraday rotation data. In this context, the Local Bubble, a... -
Pedro Morais (UFPB)Poster
We investigate the effects of Lorentz invariance violation on photon interactions, focusing on two key processes: the propagation in the intergalactic medium via the Breit-Wheeler process and the photon interactions in Earth's atmosphere through the Bethe-Heitler process. In the context of astroparticle propagation, we show how Lorentz violation alters the cross-section, threshold energy, and...
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Marina Scornavacche (ITeDA)Poster
Calibrating underground detectors necessitates careful consideration of the passage of penetrating particles through matter. In muon detectors based on plastic scintillators, like the Underground Muon Detector (UMD) at the Pierre Auger Observatory, the energy deposition within the plastic is significantly influenced by the generation of delta (knock-on) electrons in the surrounding ground as...
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Simon Strähnz (Karlsruhe Institute of Technology)Poster
Using radio detectors for cosmic rays is a very appealing approach, as they are cost-effective, have a nearly 100% duty cycle and can directly probe the electromagnetic component of extensive air showers. However, reconstructing the electric field from the measured voltages in an antenna by unfolding the antenna response comes with several challenges. Due to the noisiness of the signal, it is...
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Luciana Andrade DouradoPoster
The current generation of observatories has confirmed that ultra-high-energy cosmic rays (UHECRs) are not composed only of protons. In particular, analyses of the distributions of shower-maximum depths have revealed an increasing trend in the mass composition of particles with energies above approximately $2 \: \rm EeV$. Given that photodisintegration is the primary interaction for nuclei...
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Carmina Pérez Bertolli (ITeDA)Poster
The main goal of AugerPrime is to extend the Pierre Auger Observatory’s sensitivity to cosmic ray composition into the flux suppression region of ultra-high energy cosmic rays (UHECRs) above 10$^{19}\,$eV. This involves enhancing the measurement capabilities of existing surface detectors to better distinguish between the muonic and electromagnetic components of air showers. Accurate methods to...
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Varada VarmaPoster
Various detectors at Pierre Auger Observatory observe the extensive air showers using different observation techniques. The most reliable technique for studying the composition is the fluorescence technique, which observes the longitudinal development of the charged component of an atmospheric air shower. Any difference in composition will be visible in the cross-section of the interactions...
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Dr Anton Prosekin (Institute of Physics, Academia Sinica)Talk
Accurate reconstruction of Ultra-High-Energy Cosmic Ray (UHECR) parameters is crucial for understanding their origins and composition. We present a newly developed Deep Neural Network (DNN) approach based on the AixNet architecture for reconstructing UHECR parameters from Telescope Array surface detector (SD) data. This model reconstructs key parameters, including energy, arrival direction,...
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Fabian Schüssler (IRFU / CEA Paris-Saclay)Talk
Recent years have brought a number of breakthroughs and discoveries in high-energy astrophysics. Many of these advances are related to transient phenomena and involve all known cosmic messengers from radiation across the full electromagnetic spectrum to high-energy neutrinos, gravitational waves, and cosmic rays. Due to their high sensitivity and increasingly optimized response to transient...
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Kozo Fujisue (Institute of Physics, Academia Sinica)Poster
The Global Spline Fit is a data-driven parameterization of cosmic-ray flux and mass composition. It combines direct and indirect measurements of cosmic-ray flux of individual elements from 1 GeV to $10^{11}$ GeV, considering their uncertainties. At lower energies, the flux is corrected to the local interstellar spectra using the individual data-taking periods of the experiments. The systematic...
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Beatriz de Errico (Federal University of Rio de Janeiro - UFRJ)Talk
GRAND (the Giant Radio Array for Neutrino Detection) is a proposed next-generation observatory of ultra-high-energy (UHE) neutrinos, cosmic rays, and gamma rays of cosmic origin, with energies exceeding about 100 PeV. GRAND is a collection of large-scale ground arrays of self-triggered radio antennas that target the radio emission from extensive air showers initiated by UHE particles. Three...
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Beatriz de Errico (Federal University of Rio de Janeiro - UFRJ)Poster
The Giant Radio Array for Neutrino Detection (GRAND) is an envisioned next-generation observatory designed to detect ultra-high-energy (UHE) neutrinos, cosmic rays, and gamma rays, with energies exceeding 100 PeV. GRAND will consist of multiple large-scale ground arrays of self-triggered radio antennas, aiming to detect the radio emission from extensive air showers initiated by these UHE...
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Bjarni Pont (Radboud University)Talk
The Auger Engineering Radio Array (AERA) at the Pierre Auger Observatory is an array of 153 radio-antenna stations that measure the 30-80 MHz radio emission produced in extensive air showers in the energy range between 0.1 and 10 EeV. It has been taking data for over a decade now. In this contribution, we present the recent results of AERA. We show the measurements of the depths of the shower...
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Luca DevalPoster
The deflections of ultra-high energy cosmic rays caused by the Galactic and extragalactic magnetic fields limit the information that can be learned from the arrival directions of particles detected on Earth regarding their potential sources. Recent studies by the Pierre Auger Collaboration have identified an anisotropy in the arrival directions of events exceeding 32 EeV, suggesting that...
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Chloé Gaudu (Bergische Universität Wuppertal)Poster
The field of air shower physics is dedicated to understanding the development of cosmic-ray interactions with the Earth's atmosphere. However, it faces a significant challenge regarding the muon content of extensive air showers (EAS) observed by several cosmic-ray experiments, such as the Pierre Auger Observatory. Current simulations employing state-of-the-art hadronic interaction models yield...
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Mr Alessandro Cermenati (Gran Sasso Science Institute (GSSI), IINFN-Laboratori Nazionali del Gran Sasso (LNGS),)Poster
In this talk, we discuss the propagation of ultra-high energy cosmic rays (UHECRs), and
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the resultant production of secondary diffuse neutrinos, in the presence of self-induced
confinement due to the excitation of the Non-Resonant Streaming Instability (NRSI)
near their sources.
UHECRs leaving their sources may induce a large electric current in the near-source
region, sufficient to... -
Joaquin de JesusPoster
As part of the upgrade of the Pierre Auger Observatory, known as AugerPrime, the Underground Muon Detector is being deployed in the low-energy extension of the Surface Detector. It comprises an array of 30 m² plastic scintillator muon counters, buried 2.3 meters underground near the water-Cherenkov detectors, allowing for a direct measurement of the muonic component of air showers in the...
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Jan Pekala (Institute of Nuclear Physics PAN, Krakow)Poster
Flares produced by some classes of astrophysical objects may be sources of some ultra-high-energy particles, which, if they are neutral, would group into clusters, highly correlated in space and time. Identification of such clustering in cosmic-ray data would provide important evidence for possible existence of neutral particles of ultra-high-energies (UHE) and could potentially help identify...
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Ryo Higuchi (RIKEN)Poster
Current observations of arrival directions of ultra-high energy cosmic rays (UHECR) whose energies are above 100 EeV do not show significant anisotropy.
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A heavier nucleus (ex. uranium) is known to have a longer propagation length than that of protons or irons. With a convolution of the longer propagation length and homogenous distribution of galaxies in longer distances, we can explain the... -
Fionna EllwangerPoster
Cosmic ray detectors like the $3000\,\text{km}^2$ surface array of the Pierre Auger Observatory are capable of observing high-energy photons in the range of $10^{18}$ to $10^{20}\,\text{eV}$ if the flux is sufficiently high.
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However, no clear candidates for ultra-high energy photons have been identified yet, so simulations must be used to study typical trigger patterns and observables for... -
Esteban RouletTalk
An update of the measurement of large-scale anisotropies in the arrival directions of ultra high-energy cosmic rays detected at the Pierre Auger Observatory is presented. The established dipolar anisotropy in right ascension has now reached a significance of 6.8$\sigma$ when considering all energies above 8 EeV and 5.7$\sigma$ when only considering energies between 8 and 16 EeV. The 3D dipole...
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Fraser Bradfield (Osaka Metropolitan University)Talk
The Fluorescence detector Array of Single-pixel Telescopes (FAST) is a next-generation cosmic ray experiment aiming to observe cosmic rays above 10$^{19}$ eV with unprecedented statistics. To achieve this, FAST will utilize low-cost, easily deployable, autonomous fluorescence telescopes spread over a detecting area an order of magnitude larger than those of current observatories. We present...
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Benjamin Flaggs (Bartol Research Institute, University of Delaware, Université Libre de Bruxelles)Poster
The next generation of cosmic and gamma ray experiments plans to answer persisting fundamental questions in ultra-high-energy astroparticle physics: what sources and acceleration mechanisms can produce the most energetic particles ever measured, with energies greater than 10 EeV? Are there any photons produced in our galaxy at 30 PeV? A proposed measurement technique for next generation...
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Steffen HahnPoster
The Pierre Auger Observatory is the largest detector for the study of extensive air showers induced by ultra-high-energy cosmic rays (UHECRs). Its hybrid detector design allows the simultaneous observation of different parts of the shower evolution using various detection techniques. To accurately understand the physics behind the origin of UHECRs, it is essential to determine their mass...
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Lukasz Bratek (Cracow University of Technology)Poster
The theoretical consideration of magnetic monopoles in astrophysical contexts introduces the possibility of their efficient acceleration to extreme energies by large-scale magnetic fields, a mechanism that could potentially produce Ultra-High-Energy (UHE) photons. However, there exists a theoretical argument, formulated within the quantum theory of the electric charge, that raises questions...
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Miguel Alexandre Martins (Instituto Galego de Física de Altas Enerxias)Poster
Ultra-high energy cosmic rays impinging on the Earth’s atmosphere offer a unique opportunity to probe hadronic interactions at the highest energies through measurements of the extensive air showers they generate. In this work, we introduce a semi-analytic mapping between new macroscopic variables describing the first ultra-high-energy proton-air interaction and the shower-to-shower values of...
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Thomas Fitoussi (KIT - IAP)Talk
For the past 20 years, the Pierre Auger Observatory has collected the largest dataset of ultra-high-energy cosmic rays (UHECRs) ever achieved using a hybrid detector. The study of this dataset has led to numerous unexpected discoveries that enhance our understanding of the origins of UHECRs. One of the key points in this study is their mass composition. In this presentation, we will present...
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Yusuke Kawachi (Osaka Metropolitan University)Poster
The Telescope Array Low-energy Extension (TALE) experiment is a project that extends the Telescope Array (TA) experiment to observe cosmic rays with energies above 1016.5 eV using 10 fluorescence detectors (FDs) and 80 surface detectors (SDs). The TALE-infill SD array, consisting of 50 SDs arranged in a grid pattern with 100-meter spacing, has been installed to extend observations...
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Hitoshi Oshima (ICRR, The University of Tokyo)Talk
The TA Low-energy Extension (TALE) experiment extends the reach of the TA experiment on the low-energy side to below $10^{16}$ eV. A primary objective of TALE is to study the transition from galactic to extragalactic cosmic rays. The TALE detector is a hybrid observatory composed of fluorescence telescopes and a surface detector array of scintillation counters. The surface detectors are...
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Marvin GottowikPoster
We present a novel approach for assessing the muon content of inclined air showers by combining the analysis of radio emissions and the particle footprint. The radiation energy reconstructed by the Auger Engineering Radio Array (AERA) will serve as an energy estimator, while the muon content will be independently estimated using the water-Cherenkov detector array (WCD) of the Pierre Auger...
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Olena Tkachenko (Institute of Physics of the Czech Academy of Sciences)Talk
The depth of the shower maximum, $X_\mathrm{max}$, as observed with the fluorescence telescopes, is one of the key most sensitive observables for probing the interaction characteristics and primary composition of ultra-high-energy cosmic rays. Nevertheless, the accurate measurement of the interaction cross-section poses a significant challenge due to the inherent limitations of standard...
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Jan Ebr (FZU - Institute of Physics of the Czech Academy of Sciences)Talk
Data from multiple experiments suggest that the current interaction models used in Monte Carlo simulations do not correctly reproduce the hadronic interactions in air showers produced by ultra-high-energy cosmic rays (UHECR).We have created a large library of UHECR simulations where the interactions at the highest energies are slightly modified in various ways – but always within the...
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Jon Paul Lundquist (University of Nova Gorica)Talk
Despite their low individual luminosity, Fanaroff-Riley Type 0 (FR0) radio galaxies have emerged as potentially significant contributors to the observed flux of ultra-high-energy cosmic rays (UHECRs, E$>$10$^{18}$ eV) due to their substantial prevalence in the local universe. Outnumbering more powerful FR radio galaxies by approximately fivefold within redshifts of z$<$0.05, FR0s may...
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Stef Verpoest (Bartol Research Institute & University of Delaware)Talk
Various measurements of muons in air showers using ground-based particle detector arrays have indicated a discrepancy between observed data and predictions from simulations. The IceCube Neutrino Observatory can offer unique insights into this issue. Its surface array, IceTop, measures the muon density at large lateral distances, while the deep in-ice detector provides information on...
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Prof. Giovanni Marsella (INFN sezione di Catania,Università degli studi di Palermo), Dr David schmidt (Karlsruher Institut für Technologie (KIT))Poster
This study focuses on identifying highly inclined muons in water-Cherenkov detectors similar to those used by the Pierre Auger Observatory using neural networks. Highly inclined muons, which are distinctive signatures of air showers induced by neutrinos or cosmic rays arriving at significant inclinations, offer a lower background rate compared to less inclined atmospheric particles. We explore...
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Ezequiel Rodriguez (ITeDA)Poster
Ultra-high-energy photons are expected as by-products of interactions between ultra-high-energy cosmic rays (UHECRs) and the cosmic microwave background, as well as from UHECR interactions with galactic matter and other, more exotic processes. Despite these various production mechanisms, the prospect is that the diffuse photon flux is low enough to prevent direct detection. Consequently,...
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Jorge Caraça-Valente Barrera (Colorado School of Mines)Poster
Neutrinos act as probes of hadronic processes and offer a distinctive view into their astrophysical origins at high energies. When reaching energies ≳PeV, tau neutrino interactions within the Earth can produce a significant flux of tau-leptons. These tau-leptons subsequently decay, generating upward-moving extensive air showers (EAS). Using the Earth as a target for neutrinos and the...
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Prof. Tomasz Bulik (University of Warsaw)Talk
Gravitational wave sources detected by LIGO Virgo and Kagra are primarily BBH but also there arre several detections of events that include neutron stars. Theses objects are primary candidates for multimessenger sources as there is plenty of matter available. I will review the current status of the observations, and the constraints on their rate density. The turbulent environment around such...
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Cainã de Oliveira (São Carlos Institute of Physics - University of São Paulo)Poster
Active galactic nuclei (AGN) are among the main candidates for ultra-high-energy cosmic ray (UHECR) sources. However, while theoretical and some phenomenological works favor AGNs as the main sources, recent works have shown that using the very-high-energy (VHE) γ-ray flux as a proxy for the UHECR flux leads to a bad agreement with data. In this context, the energy spectrum and composition data...
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Jonathan Biteau (Université Paris-Saclay, CNRS/IN2P3, IJCLab)Talk
From the detection by John Linsley (1963) of a cosmic ray of energy ∼ 1.0 × $10^{20}$ eV to the recent detection (2023) of the shower called Amaterasu by the Telescope Array experiment at ∼ 2.4 × $10^{20}$ eV (i.e. 40 joules!), our community has been striving to build the largest astroparticle observatories in the world to identify the sources of ultra-high-energy protons and nuclei. The...
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Joanna Jałocha-Bratek (Politechnika Krakowska)Poster
Strange quark stars are hypothetical objects composed of strange quark matter (SQM). SQM is unstable on the star's surface. Oscillations of strange stars, including radial oscillations, can very efficiently lead to the release of energy. Such oscillations could be excited in compact binary star systems due to tidal forces. The excitation energy depends on both the mass of the strange star and...
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Jakub Vícha (FZU - Institute of Physics of the Czech Academy of Sciences)Talk
The combination of fluorescence and surface detectors at the Pierre Auger Observatory offers unprecedented precision in testing models of hadronic interactions at center-of-mass energies around 100 TeV and beyond. However, for some time, discrepancies between model predictions and measured air-shower data have complicated efforts to accurately determine the mass composition of...
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Rossella Caruso on behalf of the JEM-EUSO Collaboration (Department of Physics and Astronomy "E.Majorana" - University of Catania & INFN-CT)
Since 2010, the international JEM-EUSO (Joint Exploratory Missions for Extreme Universe Space Observatory) collaboration has been developing an ambitious program with the support of major International and National Space Agencies and research funding institutions, to enable ultra-high-energy cosmic ray (UHECR) and high-energy neutrino observations from space. Its main objective is to develop a...
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Johannes Eser (University of Chicago)
he Ultra-High-Energy Cosmic Ray (UHECR) community outlined the current status, open questions, and roadmap for the field of UHECRs in the white paper titled "Ultra-High Energy Cosmic-Rays: at the Intersection of the Cosmic and Energy Frontiers" (Astropart. Phys. 147 (2023) 102794 - arXiv:2205.05845).
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In this paper, the community identified two types of next-generation detectors: (1)... -
Antonio Ambrosone (Gran Sasso Science Institute and INFN Laboratori Nazionali del Gran Sasso)Poster
Dark Matter (DM) existence is a milestone of the cosmological standard model and, yet its nature remains a complete mystery. In this contribution, I investigate an original way to probe the properties of sub-GeV DM particle candidates, by exploiting the cosmic-ray (CR) transport inside starburst nuclei (SBNi). Indeed, SBNi are considered CR reservoirs, thereby being able to trap CRs for $\sim...
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Yuichiro Tameda (Osaka Electro-Communication University)Talk
In order to obtain a sufficient number of observational events to clarify the origin of ultra high energy cosmic rays, a large-scale observatory is required. Currently, next-generation detectors are being developed for this purpose. The CRAFFT project focuses on developing fluorescence detectors that can be produced and operated at low cost. In this presentation, we will report on the status...
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George Filippatos (University of Chicago)Talk
High-altitude balloon-borne detectors offer a unique perspective on the extensive air showers induced by very high-energy cosmic rays. By placing a detector on the edge of the atmosphere (33 km altitude), fluorescence and Cherenkov light produced by high-altitude horizontal air showers (HAHAS) can be observed. These HAHAS develop in a rarefied atmosphere resulting in the shower’s energy being...
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Teresa Bister (Radboud University Nijmegen)Poster
It was recently shown that models where UHECR sources are transients that occur proportionally to the starformation rate of each galaxy can roughly reproduce the intermediate-scale overdensities observed in the UHECR arrival directions at $E\gtrsim$40 EeV. Based on that, we explore the prospects of a likelihood-based fit of such models to event-level data from the Pierre Auger Observatory....
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Edyvania Emily Martins (KIT)Poster
The Pierre Auger Observatory has been collecting data for over 19 years, reaching more than $123\,000\,\text{km}^2\,\text{sr}\,\text{yr}$ of accumulated exposure, with the surface detectors spread over $3\,000\,\text{km}^2$. The most significant discovery to this date is a large-scale dipole structure with a total amplitude of approximately $7\%$. This results from the observed modulation in...
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Maximilian Stadelmaier (INFN Milano, UNIMI, KIT)Poster
Air-Shower universality describes the regularity in the longitudinal, lateral, and energy distributions of electromagnetic shower particles, as motivated by solutions of the cascade equations. To reconstruct air-shower observables from ultrahigh-energy cosmic rays, we employ a universality-based model of shower development that incorporates hadronic particle components. Depending on the input...
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Kevin Almeida Cheminant (NIKHEF / Radboud University)Poster
Over the past two decades, astroparticle experiments have observed an excess of muons in air shower measurements compared to predictions based on hadronic interaction models calibrated to LHC data. This discrepancy impacts the interpretation of mass composition studies and has deep implications regarding our understanding of hadronic processes at the highest energies. In this work, we propose...
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Lawrence Wiencke (Colorado School of Mines)
The Extreme Universe Space Observatory on a Super Pressure Balloon 2 (EUSO-SPB2) flew in May of 2023, marking an important step towards the observation of ultra-high-energy cosmic rays (UHECR) and neutrino-induced showers from space. The ultimate goal of this endeavor is to complement ground-based detectors and achieve unprecedented exposure and nearly uniform full-sky coverage at the highest...
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Roberto Mussa (INFN Torino)Poster
The Pierre Auger Observatory,beyond its primary focus on cosmic rays, also yields valuable results in cosmogeophysics.. Over the past decade, its fluorescence detector (FD) has captured ELVES, light emissions from the upper mesosphere caused by lightning. Exploiting high time resolution, we validated model predictions on double and triple ELVES. Moreover, the FD traces hinted at observing...
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Frank Schroeder (Bartol Research Institute, Department of Physics and Astronomy, University of Delaware + Institute for Astroparticle Physics, Karlsruhe Institute of Technology (KIT))Talk
IceCube-Gen2, the next generation extension of the IceCube Neutrino Observatory at the South Pole, offers a unique scientific potential for cosmic-ray physics at PeV to EeV energies complementing the main science case of neutrino astronomy. The cosmic-ray science case will be enabled by a surface array on top of an extended optical array deep in the polar ice. The optical array measures TeV...
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Eiji Kido (Institute for Cosmic Ray Research, University of Tokyo)Talk
We searched for magnetic structures known as multiplets caused by magnetic deflection of ultra high energy cosmic rays in the 15 years of cosmic ray observation data from the surface detectors of the Telescope Array (TA) experiment. In this data analysis, we specifically investigated the TA hotspot in detail by using data above 57 EeV and applying the maximum likelihood estimation method to...
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Lorenzo Caccianiga (INFN - Sezione di MIlano), Pierre Auger CollaborationPoster
Astrophysical neutral particles, such as neutrons, provide a unique opportunity to trace back directly to their origins since they are not deflected by magnetic fields after being produced through interactions of charged cosmic rays in the immediate vicinity of their acceleration sites. Neutrons, being unstable particles, undergo decay, but at high energies they can travel considerable...
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Grigory Rubtsov (INR RAS)Talk
We report new results on the search for ultra-high energy photons using the Telescope Array Surface Detector (TA SD) array. The method is based on a neural network classifier trained on the photon-induced and proton-induced Monte-Carlo event sets. The classifier is trained on waveform signals at each SD station supplemented with event-level composition-sensitive parameters. The latter...
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Jaime Alvarez-Muniz (IGFAE, Univ. de Santiago de Compostela, Spain)Talk
The Pierre Auger Observatory, as a key actor in multi-messenger astronomy, is playing a crucial role in searching for and following-up cosmic phenomena across different channels. Data from the Observatory have been utilized for nearly 20 years to search for showers induced by Ultra-High-Energy (UHE) neutrinos with energies exceeding 0.1 EeV. Neutrino-induced showers at high zenith angles are...
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Dr Nicolas Martin Gonzalez (Universitá degli studi di Torino - INFN & ITeDA)Talk
The Pierre Auger Observatory, the largest air-shower experiment in the world designed to investigate ultra-high-energy (UHE, $E > 10^{17}$ eV) cosmic rays, offers unparalleled sensitivity to UHE photons. They are expected to originate from the interaction of UHE cosmic rays with background radiation fields, as well as from more exotic processes like the decay of hypothetical super-heavy dark...
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Luciana Andrade DouradoPoster
The Pierre Auger Observatory has reported a dipolar anisotropy in the distribution of arrival directions of ultra-high-energy cosmic rays (UHECRs), with an amplitude that shows a linear dependence on energy. A further investigation of the dipole amplitude can provide important information about the origin of these particles, as it is particularly sensitive to variations in the number density...
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Stef Verpoest (Bartol Research Institute & University of Delaware)Poster
We present the design and science case for a new array of radio antennas to be located at the Pierre Auger Observatory. Six stations of three SKALA antennas each will be deployed around a single water-Cherenkov surface detector triggering the radio readout. The planned antenna layout will allow for the detection of cosmic rays above a few tens of PeV, and reach full efficiency for vertical air...
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Julian Rautenberg (University Wuppertal)Poster
The interactions of ultra-high energy cosmic rays (UHECRs) in astrophysical scenarios are in general of stochastic nature. Whether the targets are photon fields (photohadronic) or other nuclei (hadronic), the outcomes of a sequence of interactions are currently obtained via Monte Carlo simulations since the compound distributions are not known. The reason is that, although the outcomes of...
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Tobias Schulz (KIT - IAP)Talk
In extensive air showers, the signals from the electromagnetic and muonic components typically span a few microseconds in scintillation detectors.
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Neutrons are the only stable neutral hadrons over the timescale of air showers.
They lose energy exclusively through hadronic interactions and quasi-elastic scattering, which results in their high abundance at ground level.
These neutrons can... -
Jihyun Kim (University of Utah)Talk
The Telescope Array (TA) experiment is a hybrid observatory designed to study ultra-high energy cosmic rays (UHECRs). As the largest UHECR observatory in the Northern Hemisphere, the TA experiment covers a 700 km$^2$ area on the ground in Millard County, Utah, USA. The TA surface detector (SD) consists of 507 plastic scintillation counters arranged on a square grid with 1.2 km spacing....
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Jihyun Kim (University of Utah)Poster
Ultra-high energy cosmic rays (UHECRs) are highly energetic charged particles originating from extragalactic sources, with energies exceeding $10^{18}$ eV. Elucidating the origin of UHECRs is a critical scientific objective. One approach is analyzing their arrival direction distribution for evidence of anisotropy. The Telescope Array (TA) experiment, the largest UHECR observatory in the...
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Mikhail Kuznetsov (INR RAS)Talk
We summarize the results of the recent anisotropy studies performed by the Telescope Array (TA) collaboration. Results on the searches for correlation of UHECR events with the LSS and the constraints of the mass composition inferred from this analysis will be presented. We also discuss the properties of the highest energy event detected by the TA and its implication for the search of UHECR...
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Diego Ravignani Guerrero (ITEDA)Talk
The distribution of the arrival directions of cosmic rays observed by the Pierre Auger Observatory has a dipolar component that implies a flux dependence on declination. Previously, we showed that the spectrum built from events arriving with a zenith angle less than 60° is qualitatively consistent with the dipole. In this work, we go one step further and show that the Auger spectrum cannot...
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Sergey Troitsky (INR RAS)Talk
Stereoscopic fluorescent observations by the High Resolution Fly's Eye detector revealed correlations between arrival directions of ultra-high-energy cosmic rays and positions of distant BL Lac type objects (Gorbunov et al. 2004, Abbasi et al. 2005). They implied the existence of non-deflected particles travelling for cosmological distances, hard to explain within standard physics and...
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Antonio Ambrosone (Gran Sasso Science Institute and INFN Laboratori Nazionali del Gran Sasso)Poster
The IceCube Collaboration has recently reported compelling evidence of high energy neutrino emission from NGC 1068, and mild excesses for NGC 4151 and CGCG420- 015, local Seyfert galaxies. This has increased the interest along neutrino emission from hot corona surrounding the super massive black holes of Seyfert Galaxies. In this contribution, I demonstrate that these sources are consistent...
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Eva Santos (FZU - Instituted of Physics of the Czech Academy of Sciences)Poster
The Pierre Auger Observatory, located near Malargüe in Mendoza, Argentina, is the largest cosmic-ray detector in existence, covering an area of $3000\,\mathrm{km}^2$. The upgraded Observatory, in phase II of operations, consists of a surface array of 1660 stations combining water Cherenkov, scintillator, and radio detectors. A subset of stations also includes underground muon detectors....
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Armando di MatteoTalk
We use the latest dataset from the surface detector array of the Pierre Auger Observatory, with events detected up to 31 December 2022 and a total exposure of 135,000 km² sr yr, to search for possible excesses in the flux of the most energetic cosmic rays on an intermediate angular scale (top-hat radius 27°, based on our previous results) from regions along the supergalactic plane. We find no...
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Jihyun Kim (University of Utah)Poster
We have simulated the Telescope Array FADC fluorescence detecter and surface detector array dataset up till 11/2018 with CORSIKA generated MC sets using three high-energy interaction models: QGSJetII-04, EPOS-LHC, and Sibyll 2.3d, and with four separate nuclear species for each model: H, He, N and Fe. The simulation includes detector response characteristics both of the surface detector, done...
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Michael Unger
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Teresa Bister (Radboud University Nijmegen)Talk
Knowledge of the coherent Galactic magnetic field (GMF) is important for many purposes, especially for interpreting the arrival directions of ultra-high-energy cosmic rays (UHECRs). For more than a decade, the community has relied mainly on a single model of the coherent field (Jansson-Farrar, JF12). Recently, a suite of models has been developed (Unger-Farrar, UF23) based on the latest data...
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Mario Bertaina (University & INFN Torino)
Mini-EUSO is a telescope launched on board the International Space Station in 2019 and currently located in the Russian section of the station and viewing our planet from a nadir-facing UV-transparent window in the Zvezda module. The instrument is based on an optical system employing two Fresnel lenses and a focal surface composed of 36 Multi-Anode Photomultiplier tubes, 64 channels each, for...
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Roberto Aloisio (Gran Sasso Science Institute (GSSI), IINFN-Laboratori Nazionali del Gran Sasso (LNGS),)Talk
We discuss the remarkable potential of neutrino and gamma-ray data from the Pierre Auger Observatory to constrain physics beyond the Standard Model. This analysis emphasizes the Observatory's capabilities in testing and potentially falsifying models of super-heavy dark matter, based on the early-universe generation of super-heavy particles, as well as models of broken Lorentz invariance, which...
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Ioana Maris (Universite libre de Bruxelles)Talk
The Pierre Auger Observatory offers a unique research infrastructure for advancing astroparticle physics. It integrates various detection techniques to study extensive air showers, including a surface array of water-Cherenkov detectors, scintillators (both surface and underground), radio antennas, and 27 fluorescence telescopes. This comprehensive setup enables precise measurement of...
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Viviana Scherini (Università del Salento and INFN Lecce Italy)Poster
During almost 20 years of regular data acquisition, the Pierre Auger Observatory, the world's largest facility for measuring ultrahigh-energy cosmic rays, has collected a vast and diverse amount of data covering complementary fields of research from astroparticle and fundamental physics to space weather science.
The Pierre Auger Collaboration has embraced the concept of open access
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to... -
Jörg Hörandel (Radboud University)Poster
To measure the properties of the highest-energy particles in the Universe with unprecedented precision we are upgrading the Pierre Auger Observatory. A crucial component of the upgrade is the Radio Detector; radio antennas have been added to all 1660 positions of the surface detector array, covering an area of 3000 km$^2$. The antennas sense radio emission, emitted by extensive air showers in...
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Lukas Nellen (I de Ciencias Nucleares, UNAM, México)Talk
The Southern Wide-field Gamma Ray Observatory (SWGO) is a collaboration to develop and construct an air-shower array for ground-based gamma ray observatory in the Southern Hemisphere. The plan is to improve on or at least equal the performance of similar observatories, like LHAASO or HAWC. SWGO will extend the sky visible to this type of instrument to the Southern Hemisphere. The detector will...
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Jörg Hörandel (Radboud University)Talk
The Global Cosmic Ray Observatory (GCOS) is a concept for a ground-based detector to measure the properties of the highest-energy particles in the Universe with unprecedented precision after the year 2035. We present the strawman/baseline design of GCOS, as developed during the 3rd GCOS workshop in 2023. The full details of this design will be made available on the arXiv before the symposium.
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Michael UngerTalk
The knowledge of the coherent and turbulent magnetic field of our
Galaxy is of great importance for interpreting the arrival directions
of Ultrahigh Energy Cosmic Rays.In this presentation, we augment our study of the coherent magnetic
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field of the Galaxy (Unger&Farrar 2023) with Faraday rotation measures
(RMs) of pulsars. In contrast to the polarized synchrotron intensity
and... -
Sergio Sciutto (Departamento de Física, Universidad Nacional de La Plata, Argentina)Talk
Venus' atmosphere -specifically its clouds buoyed up 40 to 60~km above the surface- has long been suspected to encompass a biosphere where Earth-like living organisms could grow and flourish. This idea has been recently rekindled by the observation
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(signal-to-noise ratio of about 15$\sigma$) of a phosphine (PH$_3$) absorption-line profile against the thermal background from deeper, hotter... -
Tanguy PierogTalk
The hadron production in the simulation of extensive air showers is a long standing problem and the origin of large uncertainties in the reconstruction of the mass of the high energy primary cosmic rays. Hadronic interaction models re-tuned after early LHC data give more consistent results among each other compared to the first generation of models, but still can't reproduce extended air...
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Prof. Glennys Farrar (NYU)Talk
The observed narrow range of UHECR masses at any given energy has the perplexing implication that UHECR sources produce only a narrow range of rigidities. This motivates us to propose that most or all UHECRs are accelerated in the jets of BNS mergers. These jets have been shown to result from a gravitationally-driven dynamo, so the narrow range of BNS masses provides a rationale for the...
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Dr Daniel Supanitsky (ITeDA)Poster
The origin of ultra-high-energy cosmic rays is still unknown. Despite strong evidence suggesting an extragalactic origin of the sources that accelerate the most energetic cosmic rays, they have not yet been identified. Galaxy cluster accretion shocks have been considered as a possible acceleration site for cosmic ray particles. External accretion shocks in galaxy clusters arise from the inflow...
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Domenik Ehlert (Norwegian University of Science and Technology)Poster
We present the first study to investigate ultra-fast outflows (UFOs) of active galactic nuclei as potential sites for the production of the highest-energy cosmic rays, focusing on cosmic-ray nuclei, a previously unexplored aspect. These mildly-relativistic large-scale outflows, with velocities reaching up to half the speed of light, are ubiquitous in active galactic nuclei. We numerically...
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Zhang Bing Theodore (Institute of high energy physics, CAS)Poster
We investigate the propagation of ultraheavy (UH) nuclei as ultrahigh-energy cosmic rays (UHECRs). We show that their energy loss lengths at $\lesssim300$~EeV are significantly longer than those of protons and intermediate-mass nuclei and that the highest-energy cosmic rays with energies beyond $\sim100$~EeV, including the Amaterasu particle, may originate from such UH-UHECRs. We derive...
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Marta BianciottoTalk
The flux of ultra-high-energy cosmic rays (UHECRs) is remarkably uniform across all directions in the sky. The only anisotropy detected with a significance greater than 5 sigma is a large-scale dipolar modulation in right ascension for energies above 8 EeV. To enhance our sensitivity to other potential anisotropies, which may be obscured by significant deflections by magnetic fields, two...
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Laura Valore (Università di Napoli Federico II and INFN Napoli)Poster
The Pierre Auger Observatory is equipped with a sophisticated atmospheric monitoring system that has been operating smoothly for about 20 years. E.g., it provides hourly corrections to cosmic-ray data recorded by the Fluorescence Detector as well as updates on cloud conditions, ensuring high quality data. In recent years, new tools have been integrated in addition to the standard instruments:...
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Etienne Parizot (APC, Université Paris CIté)Talk
Contrary to what had been hoped a quarter of a century ago, pointing astronomy with ultra-high-energy cosmic rays (UHECR) has remained elusive, despite considerable increase in statistics. The reason is most probably due to much larger deflections than anticipated under the assumption that most UHECRs would be protons, as well as a possibly much larger number of contributing sources. While it...
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