Full-sky searches for anisotropies in UHECR arrival directions with the Pierre Auger Observatory and the Telescope Array

High-energy neutrinos are expected to be produced by the interaction of accelerated particles near the acceleration sites. For this reason, it is intresting to search for correlation in the arrival directions of ultra–high energy cosmic rays (UHECRs) and HE neutrinos. We present here the results of a search for correlations between UHECR events measured by the Pierre Auger Observatory and Telescope Array and high-energy neutrino candidate events from IceCube and ANTARES. We perform a cross-correlation analysis, where the angular separation between the arrival directions of UHECRs and neutrinos is scanned. When comparing the results with the expectations from a null hypothesis contemplating an isotropic distribution of neutrinos or of UHECR we obtain post-trial p-values of the order of ~ 10 2.

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ENERGY ORDERING EFFECTS IN THE ARRIVAL DIRECTIONS OF ULTRA-HIGH ENERGY COSMIC RAYS MEASURED BY THE PIERRE AUGER OBSERVATORY

International Journal of Modern Physics E ◽

10.1142/s021830131104058x ◽

2011 ◽

Vol 20 (supp02) ◽

pp. 50-56

Author(s):

◽

PETER SCHIFFER

Keyword(s):

Cosmic Rays ◽

Magnetic Fields ◽

Charged Particles ◽

High Energy ◽

Pierre Auger Observatory ◽

Ultra High Energy ◽

High Energy Cosmic Rays ◽

Ordering Effects ◽

Arrival Directions

The Pierre Auger Observatory is the world's largest experiment for the measurement of ultra-high energy cosmic rays (UHECRs). These UHECRs are assumed to be to be charged particles, and thus are deflected in cosmic magnetic fields. Recent results of the Pierre Auger Observatory addressing the complex of energy ordering of the UHECRs arrival directions are reviewed in this contribution. So far no significant energy ordering has been observed.

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Search for signatures of magnetically-induced alignment in the arrival directions measured by the Pierre Auger Observatory

Astroparticle Physics ◽

10.1016/j.astropartphys.2011.10.004 ◽

2012 ◽

Vol 35 (6) ◽

pp. 354-361 ◽

Cited By ~ 21

Author(s):

P. Abreu ◽

M. Aglietta ◽

E.J. Ahn ◽

I.F.M. Albuquerque ◽

D. Allard ◽

...

Keyword(s):

Pierre Auger Observatory ◽

Arrival Directions

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Anisotropies in the arrival directions of ultra-high-energy cosmic rays measured at the Pierre Auger Observatory

Physica Scripta ◽

10.1088/1402-4896/abf451 ◽

2021 ◽

Author(s):

Teresa Bister

Keyword(s):

Cosmic Rays ◽

High Energy ◽

Pierre Auger Observatory ◽

Ultra High Energy ◽

High Energy Cosmic Rays ◽

Arrival Directions

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Depth of maximum of air-shower profiles: testing the compatibility of measurements performed at the Pierre Auger Observatory and the Telescope Array experiment

EPJ Web of Conferences ◽

10.1051/epjconf/201921001009 ◽

2019 ◽

Vol 210 ◽

pp. 01009

Author(s):

Alexey Yushkov ◽

Jose Bellido ◽

John Belz ◽

Vitor de Souza ◽

William Hanlon ◽

...

Keyword(s):

Quantitative Comparison ◽

Pierre Auger Observatory ◽

Array Detector ◽

Air Showers ◽

Fluorescence Detector ◽

Telescope Array ◽

Longitudinal Development ◽

Air Shower ◽

Direct Observations ◽

Systematic Uncertainties

At the Pierre Auger Observatory and the Telescope Array, the measurements of depths of maximum of airshower profiles, Xmax, are performed using direct observations of the longitudinal development of showers with the help of the fluorescence telescopes. Though the same detection technique is used at both installations, the straightforward comparison of the characteristics of the measured Xmax distributions is not possible due to the different approaches to the analysis of the recorded events. In this work, the Auger – Telescope Array composition working group presents a technique to compare the Xmax measurements from the Auger Observatory and the Telescope Array. Applying this technique the compatibility of the first two moments of the measured Xmax distributions is qualitatively tested for energies 1018.2 eV < E < 1019.0 eV using the recently published Telescope Array data from the Black Rock Mesa and Long Ridge fluorescence detector stations. For a quantitative comparison, simulations of air showers with EPOS-LHC, folded with effects of the Telescope Array detector, are required along with the inclusion in the analysis of the systematic uncertainties in the measurements of Xmax and the energies of the events.

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A next-generation ground array for the detection of ultrahigh-energy cosmic rays: the Fluorescence detector Array of Single-pixel Telescopes (FAST)

EPJ Web of Conferences ◽

10.1051/epjconf/201921006003 ◽

2019 ◽

Vol 210 ◽

pp. 06003

Author(s):

Toshihiro Fujii ◽

Max Malacari ◽

Justin Albury ◽

Jose A. Bellido ◽

Ladislav Chytka ◽

...

Keyword(s):

Cosmic Rays ◽

Full Scale ◽

Pierre Auger Observatory ◽

Detector Array ◽

Ultrahigh Energy ◽

Next Generation ◽

Fluorescence Detector ◽

Telescope Array ◽

Ultrahigh Energy Cosmic Rays ◽

Single Pixel

The origin and nature of ultrahigh-energy cosmic rays (UHECRs) is one of the most intriguing and important mysteries in astroparticle physics. The two largest observatories currently in operation, the Telescope Array Experiment in central Utah, USA, and the Pierre Auger Observatory in western Argentina, have been steadily observing UHECRs in both hemispheres for over a decade. We highlight the latest results from both of these experiments, and address the requirements for a next-generation UHECR observatory. The Fluorescence detector Array of Single-pixel Telescopes (FAST) is a design concept for a next-generation UHECR observa-tory, addressing the requirements for a large-area, low-cost detector suitable for measuring the properties of the highest energy cosmic rays with an unprecedented aperture. We have developed a full-scale prototype consisting of four 200 mm photomultiplier-tubes at the focus of a segmented mirror of 1.6 m in diameter. Over the last three years, we installed three such prototypes at the Black Rock Mesa site of the Telescope Array Experiment. These telescopes have been steadily taking data since installation. We report on preliminary results of the full-scale FAST prototypes, including measurements of distant ultraviolet lasers and UHECRs. Futhermore, we discuss our plan to install an additional identical FAST prototype at the Pierre Auger Observatory. Possible benefits to the Telescope Array and the Pierre Auger Observatory include a comparison of the transparency of the atmosphere above both experiments, a study of the systematic uncertainty associated with their existing fluorescence detectors, and a cross-calibration of their energy and Xmax scales.

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The Pierre Auger Observatory: Review of Latest Results and Perspectives

Universe ◽

10.3390/universe4110128 ◽

2018 ◽

Vol 4 (11) ◽

pp. 128 ◽

Cited By ~ 2

Author(s):

Dariusz Góra ◽

Keyword(s):

Energy Spectrum ◽

Cosmic Rays ◽

Detection System ◽

Cosmic Ray ◽

High Energy ◽

Pierre Auger Observatory ◽

Mass Composition ◽

Ultra High Energy ◽

Energy Limitation ◽

Arrival Directions

The Pierre Auger Observatory is the world’s largest operating detection system for the observation of ultra high energy cosmic rays (UHECRs), with energies above 10 17 eV. The detector allows detailed measurements of the energy spectrum, mass composition and arrival directions of primary cosmic rays in the energy range above 10 17 eV. The data collected at the Auger Observatory over the last decade show the suppression of the cosmic ray flux at energies above 4 × 10 19 eV. However, it is still unclear if this suppression is caused by the energy limitation of their sources or by the Greisen–Zatsepin–Kuzmin (GZK) cut-off. In such a case, UHECRs would interact with the microwave background (CMB), so that particles traveling long intergalactic distances could not have energies greater than 5 × 10 19 eV. The other puzzle is the origin of UHECRs. Some clues can be drawn from studying the distribution of their arrival directions. The recently observed dipole anisotropy has an orientation that indicates an extragalactic origin of UHECRs. The Auger surface detector array is also sensitive to showers due to ultra high energy neutrinos of all flavors and photons, and recent neutrino and photon limits provided by the Auger Observatory can constrain models of the cosmogenic neutrino production and exotic scenarios of the UHECRs origin, such as the decays of super heavy, non-standard-model particles. In this paper, the recent results on measurements of the energy spectrum, mass composition and arrival directions of cosmic rays, as well as future prospects are presented.

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Overview of the Auger@TA project and preliminary results from Phase I

EPJ Web of Conferences ◽

10.1051/epjconf/201921005002 ◽

2019 ◽

Vol 210 ◽

pp. 05002

Author(s):

Fred Sarazin ◽

Corbin Covault ◽

Toshihiro Fujii ◽

Robert Halliday ◽

Jeﬀrey Johnsen ◽

...

Keyword(s):

Phase I ◽

Pierre Auger Observatory ◽

Gear Up ◽

Air Showers ◽

Telescope Array ◽

Surface Detector ◽

First Results ◽

Micro Array ◽

Cross Calibration

We report on the first results of a unique in-situ experimental cross-calibration eﬀort of the surface detector of the Pierre Auger Observatory and of the Telescope Array experiment (Auger@TA). In the first phase of Auger@TA, we performed surface detector station-to-station comparisons for a collection of extensive air showers landing near the experimental setup and detected by Telescope Array. Beyond the deduced cross-calibration curve between the Water-Cherenkov-based Auger and Scintillator-based TA Surface Detector stations, we also investigate the consistency of their response for individual reconstructed showers. The dataset is currently too small to draw firm conclusions as-of-yet. Hence, phase I data taking will continue even as we gear up for the deployment of an Auger micro-array within Telescope Array as part of Phase II of this work.

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