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Spectral analysis of new black hole candidate AT2019wey observed by NuSTAR

Science China(Physics,Mechanics & Astronomy) 2022年第1期65卷 92-102页

作者： Ye Feng XueShan Zhao LiJun Gou YuFeng Li James FSteiner javier agarc´ıa Yuan Wang Nan Jia ZhenXuan Liao HuiXian Li Key Laboratory for Computational Astrophysics National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100012China School of Astronomy and Space Sciences University of Chinese Academy of SciencesBeijing 100049China Harvard-Smithsonian Center for Astrophysics Cambridge MA 02138USA Cahill Centre for Astronomy and Astrophysics California Institute of TechnologyPasadena CA 91125USA Dr.Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics Bamberg 96052Germany School of Science Jimei UniversityXiamen 361021China

AT2019 wey is a new galactic X-ray binary that was first discovered as an optical transient by the Asteroid Terrestrial-impact Last Alert System(ATLAS)on December 7,2019.AT2019 wey consists of a black hole candidate as well as a low-mass companion star(M_(star)≤1.0 M_(■))and is likely to have a short orbital period(P_(orb)≤16h).Although AT2019 wey began activation in the X-ray band on March 8,2020,it did not enter the soft state during almost the entire outburst.In this study,we present a detailed spectral analysis of AT2019 wey in the low/hard state during its X-ray outburst on the basis of Nuclear Spectroscopic Telescope Array(Nu S T AR)observations.We obtain tight constraints on several of its important physical parameters by applying the state of the art relxill relativistic reflection model family.In particular,we determine that the measured inner radius of the accretion disk is most likely to have extended to the innermost stable circular orbit(ISCO)radius,i.e.,R_(in)=1.38^(+0.23)_(-0.16)R_(ISCO).Hence,assuming R_(in)=R_(ISCO),we find the spin of AT2019 wey to be a*~0.97,which is close to the extreme and an inner disk inclination angle of i~22°.Additionally,according to our adopted models,AT2019 wey tends to have a relatively high iron abundance of AFe~5A_(Fe,■)and a high disk ionization state of logξ~3.4.

关键词： NuSTAR black hole physics X-rays binaries-stars individual AT2019wey

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