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Hironori Matsumoto, Masaru Ueno, Aya Bamba, Yoshiaki Hyodo, Hideyuki Mori, Hideki Uchiyama, Takeshi Go Tsuru, Katsuji Koyama, Jun Kataoka, Hideaki Katagiri, Tadayuki Takahashi, Junko Hiraga, Shigeo Yamauchi, John P. Hughes, Atsushi Senda, Motohide Kokubun, Takayoshi Kohmura, Frederick S. Porter, Suzaku Observations of HESS J1616—508: Evidence for a Dark Particle Accelerator, Publications of the Astronomical Society of Japan, Volume 59, Issue sp1, 30 January 2007, Pages S199–S208, https://doi.org/10.1093/pasj/59.sp1.S199
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Abstract
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 |$3.1 \times 10^{-13} \,\mathrm{erg} \,\mathrm{s}^{-1} \,\mathrm{cm}^{-2}$| in the 2–10 keV band, which is some 60-times below the |$\gamma$|-ray flux in the 1–10TeV 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 |$kT \sim 0.3 \hbox{--} 0.6 \,\mathrm{keV}$| 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.
