A Multiwavelength Study of the γ-Ray Binary Candidate HESS J1832-093

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

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1 Citation (Scopus)


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 (ΓX∼ 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 (α =-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.

Original languageEnglish
Article number75
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 2020 Aug 10

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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