Nature of the Unidentified TeV Source HESS J1614-518, Revealed by Suzaku and XMM-Newton Observations
Abstract
We report on new Suzaku and XMM-Newton results concerning HESS J1614-518, which is one of the brightest extended TeV γ-ray sources and has two regions with intense γ-ray emission. We newly observed the south and center regions of HESS J1614-518 with Suzaku, since the north region, including the position of the 1st brightest peak of the TeV γ-ray emission, has already been observed. No X-ray counterpart was found at the position of the 2nd brightest peak of the TeV γ-ray emission; we estimated the upper limit of the X-ray flux to be 1.6 × 10-13 erg cm-2 s-1 in the 2-10 keV band. The soft X-ray source Suzaku J1614-5152, which was found at the edge of the field of view in a previous observation, was also detected at the middle of HESS J1614-518. Analyzing the XMM-Newton archival data, we revealed that Suzaku J1614-5152 consists of multiple point sources. The X-ray spectrum of the brightest point source, XMMU J161406.0-515225, can be described by a power-law model with a photon index of Γ = 5.2+0.6-0.5, or a blackbody model with temperature kT = 0.38+0.04-0.04 keV. In the blackbody model, the hydrogen-equivalent column density is almost the same as that of the hard extended X-ray emission, Suzaku J1614-5141, which was found at the 1st peak position. If true, XMMU J161406.0-515225 may be physically related to Suzaku J1614-5141 and HESS J1614-518.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- November 2011
- DOI:
- 10.1093/pasj/63.sp3.S879
- arXiv:
- arXiv:1110.3562
- Bibcode:
- 2011PASJ...63S.879S
- Keywords:
-
- acceleration of particles;
- X-rays: individual (HESS J1614‑518);
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- Accepted for publication in PASJ Vol.63 No.SP3