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Spectral and Temporal Analysis of the Supergiant Fast X-ray Transient IGR J16195–4945 with SRG/ART-XC

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Abstract

We present the results of the analysis of the SRG/ART-XC observation of the Supergiant Fast X-ray Transient IGR J16195-4545 performed on March 3, 2021. Six bright flares are present in the light curve, with no significant change in hardness occuring during these flares. The spectrum is described with an absorbed power law model with a high energy exponential cutoff showing heavy absorption, with \(N_{\textrm{H}}=(12\pm 2)\times 10^{22}\text{ cm}^{-2}\) and \(\Gamma=0.56\pm 0.15\), \(E_{\textrm{cut}}=13\pm 2\) keV. Adopting the Bayesian block decomposition of the light curve, we measured the properties of the observed flares (duration, rise time, waiting time, released energy and pre-flare luminosity), which are consistent with the quasi-spherical subsonic accretion model. The stellar wind velocity of the supergiant is estimated to be \(v_{w}\approx 500\) km s\({}^{-1}\). Additionally, the system was found to have an unusual near-IR variability.

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ACKNOWLEDGMENTS

We thank the referees for their useful comments that helped to improve this manuscript.

This work is based on data from Mikhail Pavlinsky ART-XC X-ray telescope aboard the SRG observatory. The SRG observatory was built by the Lavochkin Association (NPOL) (part of State Corporation Roscosmos) in the interests of the Russian Academy of Sciences represented by its Space Research Institute (IKI) in the framework of the Russian Federal Space Program, with the participation of the Deutsches Zentrum für Luft- und Raumfahrt (DLR). The ART-XC team thank the Russian Space Agency, Russian Academy of Sciences and State Corporation Rosatom for the support of the SRG project and the Lavochkin Association (NPOL) with partners for the creation and operation of the SRG spacecraft (Navigator).

Funding

The work was supported by the Russian Science Foundation, project no. 19-12-00423.

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Authors and Affiliations

  1. Space Research Institute, Moscow, Russia

    M. N. Satybaldiev, I. A. Mereminskiy, A. A. Lutovinov, D. I. Karasev, A. N. Semena & A. E. Shtykovsky

  2. Moscow Institute of Physics and Technology, Moscow, Russia

    M. N. Satybaldiev

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  1. M. N. Satybaldiev
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  2. I. A. Mereminskiy
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  3. A. A. Lutovinov
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Correspondence to M. N. Satybaldiev.

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Satybaldiev, M.N., Mereminskiy, I.A., Lutovinov, A.A. et al. Spectral and Temporal Analysis of the Supergiant Fast X-ray Transient IGR J16195–4945 with SRG/ART-XC. Astron. Lett. 49, 249–256 (2023). https://doi.org/10.1134/S106377372305002X

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