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arXiv · 2107.05588

Peculiar X-ray transient SRGA J043520.9+552226/AT2019wey discovered with SRG/ART-XC

I. A. Mereminskiy·A. V. Dodin·A. A. Lutovinov·A. N. Semena·V. A. Arefiev·K. E. Atapin·A. A. Belinski·R. A. Burenin·M. V. Burlak·M. V. Eselevich·A. A. Fedotieva·M. R. Gilfanov·N. P. Ikonnikova·R. A. Krivonos·I. Yu. Lapshov·A. R. Lyapin·P. S. Medvedev·S. V. Molkov·K. A. Postnov·M. S. Pshirkov·S. Yu. Sazonov·N. I. Shakura·A. E. Shtykovsky·R. A. Sunyaev·A. M. Tatarnikov·A. Yu. Tkachenko·S. G. Zheltoukhov
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Abstract

Context: During the ongoing all-sky survey, the Mikhail Pavlinsky ART-XC telescope on board the SRG observatory should discover new X-ray sources, many of which can be transient. Here we report on the discovery and multiwavelength follow-up of a peculiar X-ray source SRGA J043520.9+552226=SRGe J043523.3+552234 - the high-energy counterpart of the optical transient AT2019wey. Aims: Thanks to its sensitivity and the survey strategy, the Mikhail Pavlinsky ART-XC telescope uncovers poorly studied weak transient populations. Using a synergy with current public optical surveys, we are aiming at revealing the nature of these transients to study its parent populations. The SRGA J043520.9+552226 is the first transient detected by ART-XC which has a bright optical counterpart suitable for further studies. Methods: We have used available public X-ray and optical data and observations with SRG, INTEGRAL, NuSTAR, NICER and ground-based telescopes to investigate the source spectral energy distributions at different phases of the outburst. Results: Based on X-ray spectral and timing properties derived from space observations, optical spectroscopy and photometry obtained with the 2.5-m and RC600 CMO SAI MSU telescopes, we propose the source to be a black hole in a low-mass close X-ray binary system.

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I. A. Mereminskiy, A. V. Dodin, A. A. Lutovinov, A. N. Semena, V. A. Arefiev, K. E. Atapin, A. A. Belinski, R. A. Burenin, M. V. Burlak, M. V. Eselevich, A. A. Fedotieva, M. R. Gilfanov, N. P. Ikonnikova, R. A. Krivonos, I. Yu. Lapshov, A. R. Lyapin, P. S. Medvedev, S. V. Molkov, K. A. Postnov, M. S. Pshirkov, S. Yu. Sazonov, N. I. Shakura, A. E. Shtykovsky, R. A. Sunyaev, A. M. Tatarnikov, A. Yu. Tkachenko, S. G. Zheltoukhov. 2021-07-12. Peculiar X-ray transient SRGA J043520.9+552226/AT2019wey discovered with SRG/ART-XC. https://doi.org/10.1051/0004-6361%2F202141410

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