论文标题
NGC 5092中的X射线潮汐破坏事件候选者的多波长研究
Multiwavelength Study of an X-ray Tidal Disruption Event Candidate in NGC 5092
论文作者
论文摘要
我们介绍了瞬态X射线源XMMSL1 J131952.3+225958的多波长研究，该研究与$ z = 0.023 $相关的Galaxy NGC 5092在XMM-Newton Slew Sumple（XMMSL）中检测到。与先前的磁通限制相比，2005年的0.2--2 KEV频段中的来源在2005年降低了$> 20美元的倍数，然后在2013年XMM-Newton的XMM-Newton在2018年逐渐降低了$> 200 $的倍数。 10^{43} $ erg s $^{ - 1} $。还可以在X射线耀斑的几个月内通过银河进化探险仪和斯隆数字天空调查检测到紫外线和光学耀斑，X射线耀斑的几个月内，它们的非恒星紫外线 - 光学频谱可以与黑体一起以$ \ sim $ $ $ $ $ $ $ $ $ $ $ $ k和$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $（2）的温度来描述。 ERG S $^{ - 1} $。有趣的是，NGC 5092对NGC 5092的中海监测观察结果5--13年，后来显示不断下降。从X射线到紫外线到光学红外，这些戏剧性的可变性特性似乎是有序的，暗示了一个巨大的黑洞，暗示了恒星的潮汐破坏事件（TDE），证实了Kanner等人（2013年）的假设。该TDE候选者属于罕见的样本，在X射线，紫外线和光学中检测到同时的明亮发射，后来在中红外的灰尘取得的光照回声。黑洞的质量为$ \ sim $ 5 \ times 10^{7} \ rm m _ {\ odot} $，居住在一个由2.5 Gyr的中年恒星种群主导的星系中。
We present multiwavelength studies of a transient X-ray source, XMMSL1 J131952.3+225958, associated with the galaxy NGC 5092 at $z=0.023$ detected in the XMM-Newton SLew survey (XMMSL). The source brightened in the 0.2--2 keV band by a factor of $>20$ in 2005 as compared with previous flux limits and then faded by a factor of $>200$ as observed with it XMM-Newton in 2013 and with it Swift in 2018. At the flaring state, the X-ray spectrum can be modeled with a blackbody at a temperature of $\sim$ 60 eV and an overall luminosity of $\sim$ $1.5 \times 10^{43}$ erg s$^{-1}$. A UV flare and optical flare were also detected with the Galaxy Evolution Explorer and the Sloan Digital Sky Survey, respectively, within several months of the X-ray flare, whose nonstellar UV--optical spectrum can be described with a blackbody at a temperature of $\sim$ $(1-2) \times 10^4$ K and a luminosity of $\sim$ $(2-6) \times 10^{43}$ erg s$^{-1}$. Interestingly, mid-infrared monitoring observations of NGC 5092 with the Wide-field Infrared Survey Explorer 5--13 yr later show a continuous flux decline. These dramatic variability properties, from the X-ray through UV and optical to infrared, appear to be orderly, suggestive of a stellar tidal disruption event (TDE) by a massive black hole, confirming the postulation by Kanner et al.(2013). This TDE candidate belongs to a rare sample with contemporaneous bright emission detected in the X-ray, UV, and optical, which are later echoed by dust-reprocessed light in the mid-infrared. The black hole has a mass of $\sim$ $5 \times 10^{7} \rm M_{\odot}$, residing in a galaxy that is dominated by a middle-aged stellar population of 2.5 Gyr.
