scholarly journals Analysis of anisotropy of ultrahigh energy cosmic ray arrival direction and energy spectrum detected by Telescope array experiment

2019 ◽  
Author(s):  
Wooram Cho ◽  
Eunho Lee ◽  
Hang Bae Kim
Keyword(s):  
Energy Spectrum ◽  
Cosmic Ray ◽  
Ultrahigh Energy ◽  
Arrival Direction ◽  
Telescope Array

RECENT RESULTS FROM THE PIERRE AUGER OBSERVATORY

2011 ◽  
Vol 20 (supp01) ◽  
pp. 118-131
Author(s):  
◽  
CAROLA DOBRIGKEIT
Keyword(s):  
Energy Spectrum ◽  
Cosmic Rays ◽  
Cosmic Ray ◽  
Pierre Auger Observatory ◽  
Detector Array ◽  
Average Depth ◽  
Ultrahigh Energy ◽  
Arrival Direction ◽  
Baseline Design ◽  
Shower Maximum

The Pierre Auger Observatory in Argentina is the largest cosmic ray detector array ever built. Its main goal is to measure cosmic rays of energy above 1018 eV with unprecedented statistics and precision. Although the construction of its baseline design was completed in mid-2008, the Observatory has been taking data continuously since January 2004. The main results obtained with the Pierre Auger Observatory are presented, with emphasis on the energy spectrum and studies of composition and arrival directions of the ultrahigh energy cosmic rays. Features observed in the energy spectrum are discussed. Results about cosmic ray composition inferred from systematic studies of the average depth of shower maximum and its fluctuations are reviewed. Recent results of studies of arrival direction distributions and correlations with nearby extragalactic objects are presented.

scholarly journals Study of muons from ultrahigh energy cosmic ray air showers measured with the Telescope Array experiment

2019 ◽  
Vol 210 ◽  
pp. 02012
Author(s):  
R. Takeishi
Keyword(s):  
Interaction Model ◽  
Cosmic Ray ◽  
Mass Composition ◽  
Ultrahigh Energy ◽  
Air Showers ◽  
Hadronic Interaction ◽  
Telescope Array ◽  
Interaction Models ◽  
Air Shower ◽  
Number Of Particles

One of the uncertainties in ultrahigh energy cosmic ray (UHECR) observation derives from the hadronic interaction model used for air shower Monte-Carlo (MC) simulations. One may test the hadronic interaction models by comparing the measured number of muons observed at the ground from UHECR induced air showers with the MC prediction. The Telescope Array (TA) is the largest experiment in the northern hemisphere observing UHECR in Utah, USA. It aims to reveal the origin of UHECRs by studying the energy spectrum, mass composition and anisotropy of cosmic rays by utilizing an array of surface detectors (SDs) and fluorescence detectors. We studied muon densities in the UHE extensive air showers by analyzing the signal of TA SD stations for highly inclined showers. On condition that the muons contribute about 65% of the total signal, the number of particles from air showers is typically 1.88 ± 0.08 (stat.) ± 0.42 (syst.) times larger than the MC prediction with the QGSJET II-03 model for proton-induced showers. The same feature was also obtained for other hadronic interaction models, such as QGSJET II-04.

scholarly journals THE MYSTERIOUS ULTRAHIGH ENERGY COSMIC RAY CLUSTERING

2001 ◽  
Vol 16 (31) ◽  
pp. 2033-2045 ◽  
Author(s):  
LUIS A. ANCHORDOQUI ◽  
HAIM GOLDBERG ◽  
STEPHEN REUCROFT ◽  
JOHN SWAIN ◽  
GUSTAVO E. ROMERO ◽  
...  
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Cosmic Rays ◽  
Cosmic Ray ◽  
Ultrahigh Energy ◽  
Arrival Direction ◽  
Ultrahigh Energy Cosmic Rays ◽  
Chance Probability

We examine the correlation between compact radio quasars (redshifts in the range z=0.3–2.2) and the arrival direction of ultrahigh energy cosmic rays forming clusters. Our Monte Carlo simulation reveals a statistically significant correlation on the AGASA sample: the chance probability of this effect being less than 1%. The implications of this result on the origin of ultrahigh energy cosmic rays are discussed.

scholarly journals Recent results from the Pierre Auger Observatory

2019 ◽  
Vol 208 ◽  
pp. 08001 ◽  
Author(s):  
Sergio Petrera
Keyword(s):  
Energy Spectrum ◽  
Cosmic Rays ◽  
Large Scale ◽  
Cosmic Ray ◽  
Pierre Auger Observatory ◽  
Mass Composition ◽  
Arrival Direction ◽  
Wide Range ◽  
Surface Detector

In this paper some recent results from the Pierre Auger Collaboration are presented. These are the measurement of the energy spectrum of cosmic rays over a wide range of energies (1017.5 to above 1020 eV), studies of the cosmic-ray mass composition with the fluorescence and surface detector of the Observatory, the observation of a large-scale anisotropy in the arrival direction of cosmic rays above 8 × 1018 eV and indications of anisotropy at intermediate angular scales above 4 × 1019 eV. The astrophysical implications of the spectrum and composition results are also discussed. Finally the progress of the upgrade of the Observatory, AugerPrime is presented.

scholarly journals Study of muons from ultrahigh energy cosmic ray air showers measured with the Telescope Array experiment

2018 ◽  
Vol 98 (2) ◽  
Author(s):  
R. U. Abbasi ◽  
M. Abe ◽  
T. Abu-Zayyad ◽  
M. Allen ◽  
R. Azuma ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Ultrahigh Energy ◽  
Air Showers ◽  
Telescope Array

scholarly journals THE COSMIC-RAY ENERGY SPECTRUM OBSERVED WITH THE SURFACE DETECTOR OF THE TELESCOPE ARRAY EXPERIMENT

2013 ◽  
Vol 768 (1) ◽  
pp. L1 ◽  
Author(s):  
T. Abu-Zayyad ◽  
R. Aida ◽  
M. Allen ◽  
R. Anderson ◽  
R. Azuma ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Cosmic Ray ◽  
Telescope Array ◽  
Surface Detector

ENERGY SPECTRUM AND SOURCE DISTRIBUTIONS OF ULTRAHIGH ENERGY COSMIC RAYS

2011 ◽  
Vol 01 ◽  
pp. 163-170
Author(s):  
CHIA-CHUN LU ◽  
GUEY-LIN LIN
Keyword(s):  
Energy Spectrum ◽  
Cosmic Rays ◽  
Cosmic Ray ◽  
Energy Calibration ◽  
Spatial Distributions ◽  
Ultrahigh Energy ◽  
The Future ◽  
Ultrahigh Energy Cosmic Rays

Motivated by Pierre Auger results on the energy spectrum and the anisotropy of ultrahigh energy cosmic rays (UHECR), we study the spatial distributions of UHECR sources by fitting to the measured UHECR spectrum. We consider possible energy calibration effects in the Pierre Auger data for our analysis. We propose a local overdensity of UHECR sources which is testable in the future cosmic ray astronomy.

scholarly journals Measurement of the Cosmic Ray Helium Energy Spectrum from 70 GeV to 80 TeV with the DAMPE Space Mission

2021 ◽  
Vol 126 (20) ◽  
Author(s):  
F. Alemanno ◽  
Q. An ◽  
P. Azzarello ◽  
F. C. T. Barbato ◽  
P. Bernardini ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Cosmic Ray ◽  
Space Mission

scholarly journals Power laws and the cosmic ray energy spectrum

2007 ◽  
Vol 27 (5) ◽  
pp. 455-464 ◽  
Author(s):  
J.D. Hague ◽  
B.R. Becker ◽  
M.S. Gold ◽  
J.A.J. Matthews
Keyword(s):  
Energy Spectrum ◽  
Cosmic Ray ◽  
Power Laws
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