Multiwavelength study of the northeastern outskirts of the extended TeV source HESS J1809-193

Blagoy Rangelov, Bettina Posselt, Oleg Kargaltsev, George G. Pavlov, Jeremy Hare, Igor Volkov

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3 Scopus citations


HESS J1809-193 is an extended TeV γ-ray source in the Galactic plane. Multiwavelength observations of the HESS J1809-193 field reveal a complex picture. We present results from three Chandra X-Ray Observatory and two Suzaku observations of a region in the northeastern outskirts of HESS J1809-193, where enhanced TeV emission has been reported. Our analysis also includes GeV γ-ray and radio data. One of the X-ray sources in the field is the X-ray binary XTE J1810-189, for which we present the outburst history from multiple observatories and confirm that XTE J1810-189 is a strongly variable type I X-ray burster, which can hardly produce TeV emission. We investigate whether there is any connection between the possible TeV extension of HESS J1809-193 and the sources seen at lower energies. We find that another X-ray binary candidate, Suzaku J1811-1900, and a radio supernova remnant, SNR G11.4-0.1, can hardly be responsible for the putative TeV emission. Our multiwavelength classification of fainter X-ray point sources also does not produce a plausible candidate. We conclude that the northeast extension of HESS J1809-193, if confirmed by deeper observations, can be considered a dark accelerator - a TeV source without a visible counterpart at lower energies.

Original languageEnglish (US)
Article number34
JournalAstrophysical Journal
Issue number1
StatePublished - Nov 20 2014

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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