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 
 NH = (12 ± 2) × 1022ñì−2, and Γ = 0.56 ± 0.15, Ecut = 13 ± 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 vw ≈ 500 km s−1.. Additionally, the system was found to have an unusual near-IR variability.

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About the authors

M. N. Satybaldiev

Space Research Institute; Moscow Institute of Physics and Technology

Email: maksatsatybaldiev@gmail.com
Moscow, Russia; Moscow, Russia

I. A. Mereminskiy

Space Research Institute

Email: maksatsatybaldiev@gmail.com
Moscow, Russia

A. A. Lutovinov

Space Research Institute, Russian Academy of Sciences

Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia

D. I. Karasev

Space Research Institute

Email: maksatsatybaldiev@gmail.com
Moscow, Russia

A. N. Semena

Space Research Institute

Email: maksatsatybaldiev@gmail.com
Moscow, Russia

A. E. Shtykovsky

Space Research Institute

Author for correspondence.
Email: maksatsatybaldiev@gmail.com
Moscow, Russia

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