Suzaku Observations of HESS J1616-508: Evidence for a Dark Particle Accelerator
Mori, Hideyuki; Porter, Frederick S.; Kokubun, Motohide; Takahashi, Tadayuki; Ueno, Masaru; Koyama, Katsuji; Hughes, John P.; Matsumoto, Hironori; Bamba, Aya; Uchiyama, Hideki; Kataoka, Jun; Kohmura, Takayoshi; Yamauchi, Shigeo; Hyodo, Yoshiaki; Senda, Atsushi; Go Tsuru, Takeshi; Katagiri, Hideaki; Hiraga, Junko
Japan, United States
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.