Large scale anisotropy of UHECRs for the Telescope Array

Journal Article · Thu Sep 22 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3628742· OSTI ID:21608326

Kido, E ^[1]

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1. Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba (Japan)

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.

• OSTI ID: 21608326
• Journal Information: AIP Conference Proceedings, Vol. 1367, 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); ISSN 0094-243X
• Country of Publication: United States
• Language: English

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79 ASTROPHYSICS
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EEV RANGE
NORTHERN HEMISPHERE
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SOLID SCINTILLATION DETECTORS
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