Multiwavelength Study of the Northeastern Outskirts of the Extended TeV Source HESS J1809-193
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 2014
- DOI:
- 10.1088/0004-637X/796/1/34
- arXiv:
- arXiv:1409.5790
- Bibcode:
- 2014ApJ...796...34R
- Keywords:
-
- acceleration of particles;
- gamma rays: general;
- ISM: individual objects: HESS J1809–193;
- X-rays: binaries;
- X-rays: individual: Suzaku J1811–1900 XTE J1810–189;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- Accepted for publication in the Astrophysical Journal