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arXiv 2012.00169astro-ph.HE
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AT2019wey:一个新的候选黑洞低质量X射线双星的多波长观测

Multi-wavelength Observations of AT2019wey: a New Candidate Black Hole Low-mass X-ray Binary

Yuhan Yao, S. R. Kulkarni, Kevin B. Burdge, Ilaria Caiazzo, Kishalay De, Dillon Dong, C. Fremling, Mansi M. Kasliwal, Thomas Kupfer, Jan van Roestel, Jesper Sol… 展开作者

Yuhan Yao, S. R. Kulkarni, Kevin B. Burdge, Ilaria Caiazzo, Kishalay De, Dillon Dong, C. Fremling, Mansi M. Kasliwal, Thomas Kupfer, Jan van Roestel, Jesper Sollerman, Ashot Bagdasaryan, Eric C. Bellm, S. Bradley Cenko, Andrew J. Drake, Dmitry A. Duev, Matthew J. Graham, Stephen Kaye, Frank J. Masci, Nicolas Miranda, Thomas A. Prince, Reed Riddle, Ben Rusholme, Maayane T. Soumagnac

摘要:

AT 2019 wey(SRGA J043520.9+552226,SRGE J043523.3+552234)是ATLAS光学调查于2019年12月首次报告的瞬变。三个月后,它在第一次全天巡天中被Spektrum-Roentgen-Gamma(SRG)任务探测到。Yao等人报告的X射线观测表明,AT 2019 wey是一个银河系低质量X射线双星(LMXB),有一个黑洞(BH)或中子星(NS)吸积体。在这里,我们提出了这个物体的紫外线,光学,近红外线和无线电观测。我们证明伴星是一颗短周期(P < 16 hr)低质量(< 1 Msun)恒星。我们认为AT 2019 wey是一个候选的BH系统,因为它在L_radio-L_X和L_opt-L_X图上的位置更接近BH双星而不是NS双星。我们证明,从2020年6月到8月,尽管在射电和X射线波长上增亮了10倍以上,但AT 2019 wey的光学光度只增加了1.3- 1.4倍。我们解释增亮前的UV/光发射为热吸积流中截断盘的热发射,增亮后的UV/光发射为外吸积盘中X射线发射的再加工。AT 2019 wey表明,结合当前的宽视场光学调查和SRG提供了一种方法来发现具有微弱X射线爆发的短周期BH LMXB系统的新兴群体。

英文摘要:

AT2019wey (SRGA J043520.9+552226, SRGE J043523.3+552234) is a transient first reported by the ATLAS optical survey in 2019 December. It rose to prominence upon detection, three months later, by the Spektrum-Roentgen-Gamma (SRG) mission in its first all-sky survey. X-ray observations reported in Yao et al. suggest that AT2019wey is a Galactic low-mass X-ray binary (LMXB) with a black hole (BH) or neutron star (NS) accretor. Here we present ultraviolet, optical, near-infrared, and radio observations of this object. We show that the companion is a short-period (P < 16 hr) low-mass (< 1 Msun) star. We consider AT2019wey to be a candidate BH system since its locations on the L_radio--L_X and L_opt--L_X diagrams are closer to BH binaries than NS binaries. We demonstrate that from 2020 June to August, despite the more than 10 times brightening at radio and X-ray wavelengths, the optical luminosity of AT2019wey only increased by 1.3--1.4 times. We interpret the UV/optical emission before the brightening as thermal emission from a truncated disk in a hot accretion flow and the UV/optical emission after the brightening as reprocessing of the X-ray emission in the outer accretion disk. AT2019wey demonstrates that combining current wide-field optical surveys and SRG provides a way to discover the emerging population of short-period BH LMXB systems with faint X-ray outbursts.

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