Suzaku observations of HESS J1616-508: Evidence for a dark particle accelerator

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


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 ergs-1 cm-2 in the 2-10keV band, which is some 60-times below the γ-ray flux in the 1-10 TeV 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 ∼ 0.3-0.6keV 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.

Original languageEnglish
Pages (from-to)S199-S208
JournalPublications of the Astronomical Society of Japan
Issue number1 SPEC. ISS.
Publication statusPublished - 2007
Externally publishedYes


  • Acceleration of particles
  • X-rays: ISM
  • X-rays: individual (HESS J1616-508)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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