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Title: Large scale anisotropy of UHECRs for the Telescope Array

Abstract

The origin of Ultra High Energy Cosmic Rays (UHECRs) is one of the most interesting questions in astroparticle physics. Despite of the efforts by other previous measurements, there is no consensus of both of the origin and the mechanism of UHECRs generation and propagation yet. In this context, Telescope Array (TA) experiment is expected to play an important role as the largest detector in the northern hemisphere which consists of an array of surface particle detectors (SDs) and fluorescence detectors (FDs) and other important calibration devices. We searched for large scale anisotropy using SD data of TA. UHECRs are expected to be restricted in GZK horizon when the composition of UHECRs is proton, so the observed arrival directions are expected to exhibit local large scale anisotropy if UHECR sources are some astrophysical objects. We used the SD data set from 11 May 2008 to 7 September 2010 to search for large-scale anisotropy. The discrimination power between LSS and isotropy is not enough yet, but the statistics in TA is expected to discriminate between those in about 95% confidence level on average in near future.

Authors:
 [1]
  1. Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba (Japan)
Publication Date:
OSTI Identifier:
21608326
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1367; Journal Issue: 1; Conference: International symposium on the recent progress of ultra-high energy cosmic ray observation, Aichi (Japan), 10-12 Dec 2010; Other Information: DOI: 10.1063/1.3628742; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ANISOTROPY; ASTROPHYSICS; CALIBRATION; COSMIC PROTONS; EEV RANGE; NORTHERN HEMISPHERE; RED SHIFT; SOLID SCINTILLATION DETECTORS; TELESCOPE COUNTERS; BARYONS; COSMIC RADIATION; EARTH PLANET; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; HADRONS; IONIZING RADIATIONS; MEASURING INSTRUMENTS; NUCLEONS; PHYSICS; PLANETS; PROTONS; RADIATION DETECTORS; RADIATIONS; SCINTILLATION COUNTERS

Citation Formats

Kido, E. Large scale anisotropy of UHECRs for the Telescope Array. United States: N. p., 2011. Web. doi:10.1063/1.3628742.
Kido, E. Large scale anisotropy of UHECRs for the Telescope Array. United States. doi:10.1063/1.3628742.
Kido, E. Thu . "Large scale anisotropy of UHECRs for the Telescope Array". United States. doi:10.1063/1.3628742.
@article{osti_21608326,
title = {Large scale anisotropy of UHECRs for the Telescope Array},
author = {Kido, E.},
abstractNote = {The origin of Ultra High Energy Cosmic Rays (UHECRs) is one of the most interesting questions in astroparticle physics. Despite of the efforts by other previous measurements, there is no consensus of both of the origin and the mechanism of UHECRs generation and propagation yet. In this context, Telescope Array (TA) experiment is expected to play an important role as the largest detector in the northern hemisphere which consists of an array of surface particle detectors (SDs) and fluorescence detectors (FDs) and other important calibration devices. We searched for large scale anisotropy using SD data of TA. UHECRs are expected to be restricted in GZK horizon when the composition of UHECRs is proton, so the observed arrival directions are expected to exhibit local large scale anisotropy if UHECR sources are some astrophysical objects. We used the SD data set from 11 May 2008 to 7 September 2010 to search for large-scale anisotropy. The discrimination power between LSS and isotropy is not enough yet, but the statistics in TA is expected to discriminate between those in about 95% confidence level on average in near future.},
doi = {10.1063/1.3628742},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1367,
place = {United States},
year = {2011},
month = {9}
}