A Possible Tidal Disruption Event Candidate in the Black Hole Binary System of OJ 287
A Possible Tidal Disruption Event Candidate in the Black Hole Binary System of OJ 287
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OJ 287 黑洞双星系统中可能存在潮汐扰乱事件候选者
DOI：
10.3847/1538-4357/ac0eff
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发表时间：
2021-06
期刊：
影响因子：
--
通讯作者：
Yunguo Jiang
中科院分区：
文献类型：
--
作者：
Shifeng Huang;Shaoming Hu;Hongxing Yin;Xu Chen;S. Alexeeva;Dong-Yang Gao;Yunguo Jiang
BL Lacertae OJ 287是一个超大质量黑洞双星（SMBHB）系统，其不规则耀斑具有复杂的物理特性。在2016年10月至2017年4月期间，在X射线，紫外线和光学波段发现了令人惊讶的爆发，而在伽马射线光变曲线中没有发现任何变化。在爆发期间，X射线光变曲线以软X射线为主，其亮度峰值为10 ^{46}text{erg}~text{s}^{-1}$ --比爆发前的平均水平高出10倍以上--并且表现出越亮越软的现象。上述现象已在以前的一些工作中报道过。硬度比随耀斑时间和软X射线光度的变化可以忽略不计。软X射线的亮度衰减遵循t^{-5/3}$的幂律，这在大多数潮汐破裂事件（TDEs）中都有发生，在软X射线衰减期间，紫外和光学波段也有类似的趋势。在爆发后的光谱中，氦和氧的窄发射线显著增强，这可能是由于TDE导致周围气体的出现。我们讨论了事件的三个可能的起源，包括喷流的进动，黑洞-盘碰撞的后效和TDE。我们的研究结果表明，TDE是更可能的情况下，解释的爆发。
The BL Lacertae OJ 287 is a supermassive black holes binary (SMBHB) system with complex physics of its irregular flares. During 2016 October -- 2017 April period, a surprising outburst in the X-ray, UV and optical bands was detected, while no variability was seen in the $gamma$-ray light curve. During the outburst, the X-ray light curves were dominated by the soft X-rays, whose peak in the luminosity was $sim$ $10^{46}text{erg}~text{s}^{-1}$ -- more than 10 times higher than the mean level before the outburst -- and a softer-when-brighter phenomenon was exhibited. These above phenomena have been reported by some previous works. The hardness ratio showed negligible evolution with flare time and soft X-ray luminosity. Critically, the luminosity of the soft X-rays decayed following a power law of $t^{-5/3}$ which occurs in most tidal disruption events (TDEs), and similar trend can be seen in UV and optical bands during the soft X-ray declining period. Helium and oxygen narrow emission lines are strengthened prominently in the optical spectra of postoutburst epochs, that could be attributed to the surrounding gas appeared due to TDE. We discuss three possible origins of the event, including the jet's precession, the aftereffect of the black hole-disk impaction and the TDE. Our results show that the TDE is the more likely scenario to explain the outburst.
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DOI：
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发表时间：
2006
期刊：
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影响因子：
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作者：
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DOI：
10.3847/1538-4357/ab04b0
发表时间：
2018-09
期刊：
The Astrophysical Journal
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10.1111/j.1365-2966.2010.17448.x
发表时间：
2010-08
影响因子：
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作者：
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通讯作者：
G. Lodato;Elena Rossi Dipartimento di Fisica;U. Milano;I. O. T. Physics;The Hebrew University;Jérusalem
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