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首页> 外文期刊>Astronomy and astrophysics >XMMSL1 J074008.2-853927: a tidal disruption event with thermal and non-thermal components
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XMMSL1 J074008.2-853927: a tidal disruption event with thermal and non-thermal components

机译：XMMSL1 J074008.2-853927：具有热和非热组件的潮汐破坏事件

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Aims. We study X-ray bright tidal disruption events (TDE), close to the peak of their emission, with the intention of understanding the evolution of their light curves and spectra. Methods. Candidate TDE are identified by searching for soft X-ray flares from non-active galaxies in recent XMM - Newton slew data. Results. In April 2014, X-ray emission was detected from the galaxy XMMSL1 J074008.2-853927 (a.k.a. 2MASX 07400785-8539307), a factor 20 times higher than an upper limit from 20 years earlier. Both the X-ray and UV flux subsequently fell, by factors of 70 and 12 respectively. The bolometric luminosity peaked at L _(bol) ~ 2 × 10~(44) ergs s ~(-1) with a spectrum that may be modelled with thermal emission in the UV band, a power-law with Γ ~ 2 dominating in the X-ray band above 2 keV and a soft X-ray excess with an effective temperature of ~ 86 eV. Rapid variability locates the X-ray emission to within & 73 R _(g) of the nuclear black hole. Radio emission of flux density ~ 1 mJy, peaking at 1.5 GHz was detected 21 months after discovery. Optical spectra indicate that the galaxy, at a distance of 73 Mpc ( z = 0.0173 ), underwent a starburst 2 Gyr ago and is now quiescent. We consider a tidal disruption event to be the most likely cause of the flare. If this proves to be correct then this is a very clean example of a disruption exhibiting both thermal and non-thermal radiation.
机译：目的我们研究接近其发射峰值的X射线亮潮汐破坏事件（TDE），旨在了解其光曲线和光谱的演变。方法。通过在最近的XMM-牛顿回转数据中搜索非活动星系的软X射线耀斑来确定候选TDE。结果。 2014年4月，从银河系XMMSL1 J074008.2-853927（又称2MASX 07400785-8539307）检测到X射线发射，这是20年前上限的20倍。随后，X射线和UV通量均下降了70倍和12倍。辐射热亮度在L _（bol）〜2×10〜（44）ergs s〜（-1）达到峰值，其光谱可用紫外波段的热发射来建模，Γ〜2的幂律在X射线波段高于2 keV，软X射线过量，有效温度约为86 eV。快速可变性将X射线发射定位在＆ 73 R _（g）的核黑洞。发现后21个月，检测到通量密度约为1 mJy的无线电发射，在1.5 GHz处达到峰值。光谱表明，距离73 Mpc（z = 0.0173）的星系在2 Gyr之前经历了一次星暴，现在处于静止状态。我们认为潮汐破坏事件是造成耀斑的最可能原因。如果事实证明是正确的，那么这是显示热辐射和非热辐射的非常清晰的例子。

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