Discovery of extended X-ray emission from an unidentified TeV source, HESS J1614-518, using the Suzaku satellite

作者：Matsumoto Hironori^*; Uchiyama Hideki; Sawada Makoto; Tsuru Takeshi G; Koyama Katsuji; Katagiri Hideaki; Yamazaki Ryo; Bamba Aya; Kohri Kazunori; Mori Koji; Uchiyama Yasunobu

来源：Publications of the Astronomical Society of Japan, 2008, 60: S163-S172.

• acceleration of particles
• ISM : cosmic rays
• X-rays : individual (HESS J1614-518)

We report Suzaku results concerning HESS J1614-518, which is the brightest extended TeV gamma-ray source discovered in the Galactic plane survey conducted using the H.E.S.S. telescope. We discovered three X-ray objects in the field of view of the X-ray Imaging Spectrometer, which were designated as Suzaku J1614-5141 (src A), Suzaku J1614-5152 (src B), and Suzaku J1614-5148 (src C). Src A is an extended source located at the peak position of HESS J1614-518, and is therefore a plausible counterpart to HESS J1614-518. The X-ray flux in the 2-10 keV band is 5 x 10(-13) erg s(-1) cm(-2), which is an order of magnitude smaller than the TeV flux. The photon index is 1.7, which is smaller than the canonical value of synchrotron emissions from high-energy electrons found in some supernova remnants. These findings present a challenge to models in which the origin of TeV emission is inverse Compton scattering of the cosmic microwave background by accelerated electrons that emit X-rays via synchrotron emission. Src B is located at a relatively dim region in the TeV band image; however, its hydrogen column density is the same as that of src A. Therefore, src B may also be physically related to HESS J1614-518. Src C is a foreground late-type B star. We also discovered soft extended X-ray emission near HESS J1614-518.

• 出版日期2008