Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/58858
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Type: Journal article
Title: Cangaroo-III search for TeV gamma rays from two clusters of galaxies
Author: Clay, R.
Stamatescu, V.
Swaby, D.
Thornton, G.
Kiuchi, R.
Mori, M.
Bicknell, G.
Edwards, P.
Enomoto, R.
Gunji, S.
Hara, S.
Hara, T.
Hattori, T.
Hayashi, S.
Higashi, Y.
Hirai, Y.
Inoue, K.
Itoh, C.
Kabuki, S.
Kajino, F.
et al.
Citation: Astrophysical Journal, 2009; 704(1):240-246
Publisher: Univ Chicago Press
Issue Date: 2009
ISSN: 0004-637X
1538-4357
Statement of
Responsibility: 
R. Kiuchi, M. Mori, G. V. Bicknell, R. W. Clay, P. G. Edwards, R. Enomoto, S. Gunji, S. Hara, T. Hara, T. Hattori, S. Hayashi, Y. Higashi, Y. Hirai, K. Inoue, C. Itoh, S. Kabuki, F. Kajino, H. Katagiri, A. Kawachi, T. Kifune, H. Kubo, J. Kushida, Y. Matsubara, T. Mizukami, Y. Mizumoto, R. Mizuniwa, H. Muraishi, Y. Muraki, T. Naito, T. Nakamori, S. Nakano, D. Nishida, K. Nishijima, M. Ohishi, Y. Sakamoto, A. Seki, V. Stamatescu, T. Suzuki, D. L. Swaby, T. Tanimori, G. Thornton, F. Tokanai, K. Tsuchiya, S. Watanabe, Y. Yamada, E. Yamazaki, S. Yanagita, T. Yoshida, T. Yoshikoshi and Y. Yukawa
Abstract: Because accretion and merger shocks in clusters of galaxies may accelerate particles to high energies, clusters are candidate sites for the origin of ultra-high-energy (UHE) cosmic rays. A prediction was presented for gamma-ray emission from a cluster of galaxies at a detectable level with the current generation of imaging atmospheric Cherenkov telescopes. The gamma-ray emission was produced via inverse Compton upscattering of cosmic microwave background photons by electron-positron pairs generated by collisions of UHE cosmic rays in the cluster. We observed two clusters of galaxies, Abell 3667 and Abell 4038, searching for very high energy gamma-ray emission with the CANGAROO-III atmospheric Cherenkov telescope system in 2006. The analysis showed no significant excess around these clusters, yielding upper limits on the gamma-ray emission. From a comparison of the upper limit for the northwest radio relic region of Abell 3667 with a model prediction, we derive a lower limit for the magnetic field of the region of ~0.1 μG. This shows the potential of gamma-ray observations in studies of the cluster environment. We also discuss the flux upper limit from cluster center regions using a model of gamma-ray emission from neutral pions produced in hadronic collisions of cosmic-ray protons with the intracluster medium. The derived upper limit of the cosmic-ray energy density within this framework is an order of magnitude higher than that of our Galaxy
Keywords: High Energy Astrophysical Phenomena (astro-ph.HE)
Rights: © IOP Publishing 2009. Submitted to Cornell University’s online archive www.arXiv.org in 2009 by Ryuta Kiuchi.Post-print sourced from www.arxiv.org.
RMID: 0020093959
DOI: 10.1088/0004-637X/704/1/240
Published version: http://arxiv.org/abs/0908.3301
Appears in Collections:Chemistry and Physics publications

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