Suzaku Observations of HESS J1616-508: Evidence for a Dark Particle   Accelerator
  We observed the bright unidentified TeV gamma-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 3.1e-13 erg/s/cm^2 in the 2--10 keV band, which is some 60 times below the gamma-ray flux in the 1--10 TeV band. This object is bright in TeV gamma-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 HESSJ1616. This may be due to the dust grain scattering halo from the nearby bright supernova remnant RCW103. 
Hironori Matsumoto (1), Masaru Ueno (2), Aya Bamba (3), Yoshiaki Hyodo   (1), Hideyuki Mori (1), Hideki Uchiyama (1), Takesh...