Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/58858
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dc.contributor.author | Clay, R. | - |
dc.contributor.author | Stamatescu, V. | - |
dc.contributor.author | Swaby, D. | - |
dc.contributor.author | Thornton, G. | - |
dc.contributor.author | Kiuchi, R. | - |
dc.contributor.author | Mori, M. | - |
dc.contributor.author | Bicknell, G. | - |
dc.contributor.author | Edwards, P. | - |
dc.contributor.author | Enomoto, R. | - |
dc.contributor.author | Gunji, S. | - |
dc.contributor.author | Hara, S. | - |
dc.contributor.author | Hara, T. | - |
dc.contributor.author | Hattori, T. | - |
dc.contributor.author | Hayashi, S. | - |
dc.contributor.author | Higashi, Y. | - |
dc.contributor.author | Hirai, Y. | - |
dc.contributor.author | Inoue, K. | - |
dc.contributor.author | Itoh, C. | - |
dc.contributor.author | Kabuki, S. | - |
dc.contributor.author | Kajino, F. | - |
dc.contributor.author | et al. | - |
dc.date.issued | 2009 | - |
dc.identifier.citation | The Astrophysical Journal: an international review of astronomy and astronomical physics, 2009; 704(1):240-246 | - |
dc.identifier.issn | 0004-637X | - |
dc.identifier.issn | 1538-4357 | - |
dc.identifier.uri | http://hdl.handle.net/2440/58858 | - |
dc.description.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 | - |
dc.description.statementofresponsibility | 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 | - |
dc.language.iso | en | - |
dc.publisher | Univ Chicago Press | - |
dc.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. | - |
dc.source.uri | http://arxiv.org/abs/0908.3301 | - |
dc.subject | High Energy Astrophysical Phenomena (astro-ph.HE) | - |
dc.title | Cangaroo-III search for TeV gamma rays from two clusters of galaxies | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1088/0004-637X/704/1/240 | - |
dc.relation.grant | ARC | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Clay, R. [0000-0002-9040-9648] | - |
Appears in Collections: | Aurora harvest Chemistry and Physics publications |
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hdl_58858.pdf | 349.33 kB | Publisher's PDF | View/Open |
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