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arXiv · 2001.07138

A multi-wavelength study of the gamma-ray binary candidate HESS J1832-093

Pak-Hin Thomas Tam·K. K. Lee·Yudong Cui·A. K. H. Kong·K. L. Li·Vlad Tudor·Xinbo He·C. P. Hu·Partha S. Pal
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Abstract

We investigate the nature of the unidentified very-high-energy (VHE) gamma-ray object, HESS J1832-093, in a multi-wavelength context. Based on X-ray variability and spectral index ($Γ_X\sim\,1.5$), and its broad-band spectrum (which was remarkably similar to HESS J0632+057, a confirmed gamma-ray binary), HESS J1832-093 has been considered to be a strong gamma-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 ($α=-1.18^{+1.04}_{-0.88}$) which prefers a gamma-ray binary over an AGN scenario. Based on spatial-spectral analysis and variability search, we found that 4FGL J1832.9-0913 is possible to be associated with SNR G22.7-0.2 rather than with HESS J1832-093 only.

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Pak-Hin Thomas Tam, K. K. Lee, Yudong Cui, A. K. H. Kong, K. L. Li, Vlad Tudor, Xinbo He, C. P. Hu, Partha S. Pal. 2020-01-20. A multi-wavelength study of the gamma-ray binary candidate HESS J1832-093. https://doi.org/10.3847/1538-4357%2Fab9e76

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