作者
Ken’ichi Tsuchiya, R Enomoto, LT Ksenofontov, Masaki Mori, T Naito, A Asahara, GV Bicknell, Roger W Clay, Y Doi, PG Edwards, S Gunji, S Hara, T Hara, T Hattori, Sei Hayashi, C Itoh, S Kabuki, F Kajino, H Katagiri, A Kawachi, T Kifune, H Kubo, T Kurihara, R Kurosaka, J Kushida, Y Matsubara, Y Miyashita, Y Mizumoto, H Moro, H Muraishi, Y Muraki, T Nakase, D Nishida, K Nishijima, M Ohishi, K Okumura, JR Patterson, RJ Protheroe, N Sakamoto, K Sakurazawa, DL Swaby, T Tanimori, H Tanimura, G Thornton, F Tokanai, T Uchida, S Watanabe, T Yamaoka, S Yanagita, T Yoshida, T Yoshikoshi
发表日期
2004/4/9
期刊
The Astrophysical Journal
卷号
606
期号
2
页码范围
L115
出版商
IOP Publishing
简介
We have detected sub-TeV gamma-ray emission from the direction of the Galactic center (GC) using the CANGAROO-II Imaging Atmospheric Cerenkov Telescope. We detected a statistically significant excess at energies greater than 250 GeV. The flux was 1 order of magnitude lower than that of the Crab Nebula at 1 TeV with a soft spectrum proportional to E-4.6±0.5. The signal centroid is consistent with the GC direction, and the observed profile is consistent with a pointlike source. Our data suggest that the GeV source 3EG J1746-2851 is identical to this TeV source, and we study the combined spectra to determine the possible origin of the gamma-ray emission. We also obtain an upper limit on the cold dark matter density in the Galactic halo.
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K Tsuchiya, R Enomoto, LT Ksenofontov, M Mori… - The Astrophysical Journal, 2004