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Title:
Suzaku Observations of HESS J1616-508: Evidence for a Dark Particle Accelerator
Authors:
Matsumoto, Hironori; Ueno, Masaru; Bamba, Aya; Hyodo, Yoshiaki; Mori, Hideyuki; Uchiyama, Hideki; Go Tsuru, Takeshi; Koyama, Katsuji; Kataoka, Jun; Katagiri, Hideaki; Takahashi, Tadayuki; Hiraga, Junko; Yamauchi, Shigeo; Hughes, John P.; Senda, Atsushi; Kokubun, Motohide; Kohmura, Takayoshi; Porter, Frederick S.
Affiliation:
AA(Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502; ) AB(Department of Physics, Faculty of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551) AC(RIKEN, Cosmic radiation group, 2-1 Hirosawa, Wako, Saitama 351-0198) AD(Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502) AE(Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502) AF(Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502) AG(Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502) AH(Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502) AI(Department of Physics, Faculty of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551) AJ(Department of Physics, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526) AK(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510) AL(RIKEN, Cosmic radiation group, 2-1 Hirosawa, Wako, Saitama 351-0198) AM(Faculty of Humanities and Social Sciences, Iwate University, 3-18-34 Ueda, Morioka, Iwate 020-8550) AN(Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019, USA) AO(RIKEN, Cosmic radiation group, 2-1 Hirosawa, Wako, Saitama 351-0198) AP(Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033) AQ(Department of General Education, Kogakuin University, 2665-1 Nakano-Cho, Hachioji, Tokyo 192-0015) AR(NASA Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Code 662, Greenbelt, MD 20771, USA)
Publication:
Publications of the Astronomical Society of Japan, Vol.59, No.SP1, pp.199-208 (PASJ Homepage)
Publication Date:
01/2007
Origin:
PASJ
Keywords:
acceleration of particles, X-rays: individual (HESS J1616-508), X-rays: ISM
Bibliographic Code:
2007PASJ...59S.199M

Abstract

We observed the bright unidentified TeV γ-ray source HESS J1616-508 with the X-ray Imaging Spectrometers onboard the Suzaku satellite. No X-ray counterpart was found to a limiting flux of 3.1 × 10-13 erg s-1 cm-2 in the 2-10keV band, which is some 60-times below the γ-ray flux in the 1-10TeV band. This object is bright in TeV γ-rays, but very dim in the X-ray band, and thus is one of the best examples in the Galaxy of a ``dark particle accelerator.'' We also detected soft thermal emission with kT ˜0.3-0.6 keV near the location of HESS J1616-508. This may be due to a dust-grain scattering halo from the nearby bright supernova remnant RCW 103.
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