Pierre Auger Observatory
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Combined fit of spectrum and composition data as measured by the Pierre Auger Observatory Open
We present a combined fit of a simple astrophysical model of UHECR sources to both the energy spectrum and mass composition data measured by the Pierre Auger Observatory. The fit has been performed for energies above 5⋅10$^{18}$ eV, i.e. t…
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Muons in air showers at the Pierre Auger Observatory: Mean number in highly inclined events Open
We present the first hybrid measurement of the average muon number in air showers at ultrahigh energies, initiated by cosmic rays with zenith angles between 62° and 80°. The measurement is based on 174 hybrid events recorded simultaneously…
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An Indication of Anisotropy in Arrival Directions of Ultra-high-energy Cosmic Rays through Comparison to the Flux Pattern of Extragalactic Gamma-Ray Sources<sup>*</sup> Open
A new analysis of the data set from the Pierre Auger Observatory provides evidence for anisotropy in the arrival directions of ultra-high-energy cosmic rays on an intermediate angular scale, which is indicative of excess arrivals from stro…
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Testing Hadronic Interactions at Ultrahigh Energies with Air Showers Measured by the Pierre Auger Observatory Open
Ultrahigh energy cosmic ray air showers probe particle physics at energies beyond the reach of accelerators. Here we introduce a new method to test hadronic interaction models without relying on the absolute energy calibration, and apply i…
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SEARCHES FOR ANISOTROPIES IN THE ARRIVAL DIRECTIONS OF THE HIGHEST ENERGY COSMIC RAYS DETECTED BY THE PIERRE AUGER OBSERVATORY Open
We analyze the distribution of arrival directions of ultra-high-energy cosmic rays recorded at the Pierre Auger Observatory in 10 years of operation. The data set, about three times larger than that used in earlier studies, includes arriva…
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Improved limit to the diffuse flux of ultrahigh energy neutrinos from the Pierre Auger Observatory Open
© Published by the American Physical Society 2015. Neutrinos in the cosmic ray flux with energies near 1 EeV and above are detectable with the Surface Detector array (SD) of the Pierre Auger Observatory. We report here on searches through …
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The Pierre Auger Observatory: Contributions to the 34th International Cosmic Ray Conference (ICRC 2015) Open
One or more papers on each of the following topics are included in this volume: energy spectrum, arrival directions and anisotropies, composition, hadronic interactions, cosmology and geophysics, detectors, and outreach.
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Energy estimation of cosmic rays with the Engineering Radio Array of the Pierre Auger Observatory Open
The Auger Engineering Radio Array (AERA) is part of the Pierre Auger Observatory and is used to detect the radio emission of cosmic-ray air showers. These observations are compared to the data of the surface detector stations of the Observ…
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The Pierre Auger Observatory Upgrade - Preliminary Design Report Open
The Pierre Auger Observatory has begun a major Upgrade of its already impressive capabilities, with an emphasis on improved mass composition determination using the surface detectors of the Observatory. Known as AugerPrime, the upgrade wil…
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Measurement of the Radiation Energy in the Radio Signal of Extensive Air Showers as a Universal Estimator of Cosmic-Ray Energy Open
We measure the energy emitted by extensive air showers in the form of radio emission in the frequency range from 30 to 80 MHz. Exploiting the accurate energy scale of the Pierre Auger Observatory, we obtain a radiation energy of 15.8±0.7(s…
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Inferences on mass composition and tests of hadronic interactions from 0.3 to 100 EeV using the water-Cherenkov detectors of the Pierre Auger Observatory Open
We present a new method for probing the hadronic interaction models at ultra-high energy and extracting details about mass composition. This is done using the time profiles of the signals recorded with the water-Cherenkov detectors of the …
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Large-scale Cosmic-Ray Anisotropies above 4 EeV Measured by the Pierre Auger Observatory Open
We present a detailed study of the large-scale anisotropies of cosmic rays with energies above 4 EeV measured using the Pierre Auger Observatory. For the energy bins [4, 8] EeV and E ≥ 8 EeV, the most significant signal is a dipolar modula…
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Depth of Ultra High Energy Cosmic Ray Induced Air Shower Maxima Measured by the Telescope Array Black Rock and Long Ridge FADC Fluorescence Detectors and Surface Array in Hybrid Mode Open
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Mass Composition of Cosmic Rays with Energies above 10$^{17.2}$ eV from the Hybrid Data of the Pierre Auger Observatory Open
We present updates on the measurements of the depth of the shower maximum $X_\rm{max}$ and the correlation between $X_\rm{max}$ and the signal in the water-Cherenkov stations of events registered simultaneously by the fluorescence and the …
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The Pierre Auger Observatory Upgrade - Preliminary Design Report Open
The Pierre Auger Observatory has begun a major Upgrade of its already impressive capabilities, with an emphasis on improved mass composition determination using the surface detectors of the Observatory. Known as AugerPrime, the upgrade wil…
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UHECR acceleration at GRB internal shocks Open
Recent results from the Pierre Auger Observatory suggest that nuclei heavier than protons might be present in significant amounts among ultrahigh-energy cosmic rays (UHECRs). It is therefore interesting to investigate the acceleration both…
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Depth of maximum of air-shower profiles at the Pierre Auger Observatory: Measurements above $10^{17.2}$ eV and Composition Implications Open
We present distributions of shower depth of maximum ($X_{\\mathrm{max}}$) and their interpretation in terms of the cosmic ray mass composition. The measurements of $X_{\\mathrm{max}}$ are based on data from the fluorescence telescopes of t…
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A New View on Auger Data and Cosmogenic Neutrinos in Light of Different Nuclear Disintegration and Air-shower Models Open
We study the implications of ultrahigh-energy cosmic-ray (UHECR) data from the Pierre Auger Observatory for potential accelerator candidates and cosmogenic neutrino fluxes for different combinations of nuclear disintegration and air-shower…
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Cosmic ray and neutrino emission from gamma-ray bursts with a nuclear cascade Open
Aim. We discuss neutrino and cosmic ray emission from gamma-ray bursts (GRBs) with the injection of nuclei, where we take into account that a nuclear cascade from photodisintegration can fully develop in the source. Our main objective is t…
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Search for photons with energies above 10<sup>18</sup>eV using the hybrid detector of the Pierre Auger Observatory Open
A search for ultra-high energy photons with energies above 1 EeV is performed using nine years of data collected by the Pierre Auger Observatory in hybrid operation mode. An unprecedented separation power between photon and hadron primarie…
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Measurement of the Fluctuations in the Number of Muons in Extensive Air Showers with the Pierre Auger Observatory Open
We present the first measurement of the fluctuations in the number of muons in extensive air showers produced by ultrahigh energy cosmic rays. We find that the measured fluctuations are in good agreement with predictions from air shower si…
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Arrival Directions of Cosmic Rays above 32 EeV from Phase One of the Pierre Auger Observatory Open
A promising energy range to look for angular correlations between cosmic rays of extragalactic origin and their sources is at the highest energies, above a few tens of EeV (1 EeV ≡ 10 18 eV). Despite the flux of these particles being extre…
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Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory Open
We present measurements of the large-scale cosmic-ray (CR) anisotropies in R.A., using data collected by the surface detector array of the Pierre Auger Observatory over more than 14 yr. We determine the equatorial dipole component, , throu…
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Direct measurement of the muonic content of extensive air showers between $$\mathbf { 2\times 10^{17}}$$ and $$\mathbf {2\times 10^{18}}~$$eV at the Pierre Auger Observatory Open
The hybrid design of the Pierre Auger Observatory allows for the measurement of the properties of extensive air showers initiated by ultra-high energy cosmic rays with unprecedented precision. By using an array of prototype underground muo…
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“ESPRESSO” ACCELERATION OF ULTRA-HIGH-ENERGY COSMIC RAYS Open
We propose that ultra-high-energy (UHE) cosmic rays (CRs) above $10^{18}$eV\nare produced in relativistic jets of powerful active galactic nuclei via an\noriginal mechanism, which we dub "espresso" acceleration: "seed" galactic CRs\nwith e…
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Progress towards characterizing ultrahigh energy cosmic ray sources Open
We use a multimessenger approach to constrain realistic mixed composition\nmodels of ultrahigh energy cosmic ray sources using the latest cosmic ray,\nneutrino, and gamma-ray data. We build on the successful\nUnger-Farrar-Anchordoqui 2015 …
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Publisher’s Note: Muons in air showers at the Pierre Auger Observatory: Mean number in highly inclined events [Phys. Rev. D<b>91</b>, 032003 (2015)] Open
\n Contains fulltext :\n 150931.pdf (Publisher’s version ) (Open Access)\n
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The cosmic ray energy spectrum measured using the Pierre Auger Observatory Open
We present an update of the cosmic ray energy spectrum measured from $3{\times}10^{17}$ eV to over $10^{20}$ eV at the Pierre Auger Observatory. This energy range is covered by combining data from the surface detector (subdividing the even…
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Acceleration of ultrahigh-energy cosmic rays in starburst superwinds Open
The sources of ultrahigh-energy cosmic rays (UHECRs) have been stubbornly\nelusive. However, the latest report of the Pierre Auger Observatory provides a\ncompelling indication for a possible correlation between the arrival directions\nof …
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Erratum: Combined fit of spectrum and composition data as measured by the Pierre Auger Observatory Open
\n Contains fulltext :\n 191482.pdf (Publisher’s version ) (Open Access)\n