A Multiwavelength Study of the γ-Ray Binary Candidate HESS J1832-093
Abstract
We investigate the nature of the unidentified very-high-energy γ-ray object, HESS J1832-093, in a multiwavelength context. Based on X-ray variability and spectral index ( ${{\rm{\Gamma }}}_{X}\sim \,1.5$ ), and its broadband spectrum, which was remarkably similar to that of HESS J0632+057—a confirmed γ-ray binary—HESS J1832-093 has been considered a strong γ-ray binary candidate in previous works. In this work, we provide further evidence for this scenario. We obtained a spectrum of its IR counterpart using Gemini/Flamingo, finding absorption lines that are usually seen in massive stars, in particular O stars. We also obtained a rather steep ATCA spectrum ( $\alpha =-{1.18}_{-0.88}^{+1.04}$ ), which is consistent with a γ-ray binary. Based on spatial-spectral analysis and variability search, we found that 4FGL J1832.9-0913 is possibly associated with SNR G22.7-0.2 rather than with HESS J1832-093 only.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- August 2020
- DOI:
- 10.3847/1538-4357/ab9e76
- arXiv:
- arXiv:2001.07138
- Bibcode:
- 2020ApJ...899...75T
- Keywords:
-
- High mass X-ray binary stars;
- Gamma-ray sources;
- Spectroscopy;
- Galactic radio sources;
- Massive stars;
- 733;
- 633;
- 1558;
- 571;
- 732;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 9 pages, 5 figures, submitted