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arXiv 1202.2118astro-ph.HEastro-ph.CO
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一种新的超铝X射线源--近侧边对螺旋NGC 891

A New Ultraluminous X-ray Source in the Nearby Edge-on Spiral NGC 891

Edmund J. Hodges-Kluck, Joel N. Bregman, Jon M. Miller, Eric W. Pellegrini

摘要:

我们报告了在附近的边缘螺旋星系NGC 891中发现的一个新的候选超亮X射线源(ULX)。该源的吸收通量为F_X ~ 10^-12 erg/s/cm ^2(对应于在9 Mpc时L_X > 10 ^40 erg/s),由于在1986年至2006年的X射线观测中没有发现它,因此它一定是在过去5年中开始爆发的。我们尝试经验拟合的XMM-牛顿光谱,发现光谱是非常适合从一个热的磁盘,一个冷的照射磁盘,或从磁盘的最里面的区域模糊的反射发射。最简单的物理模型是围绕恒星质量的黑洞(超级爱丁顿爆发)的热盘,但每个模型都有同样好的拟合。我们提出了几个后续实验,可以证伪这些模型。

英文摘要:

We report the discovery of a new candidate ultraluminous X-ray source (ULX) in the nearby edge-on spiral galaxy NGC 891. The source, which has an absorbed flux of F_X ~ 10^-12 erg/s/cm^2 (corresponding to L_X > 10^40 erg/s at 9 Mpc), must have begun its outburst in the past 5 years as it is not detected in prior X-ray observations between 1986 and 2006. We try empirical fits to the XMM-Newton spectrum, finding that the spectrum is fit very well as emission from a hot disk, a cool irradiated disk, or blurred reflection from the innermost region of the disk. The simplest physically motivated model with an excellent fit is a hot disk around a stellar-mass black hole (a super-Eddington outburst), but equally good fits are found for each model. We suggest several follow-up experiments that could falsify these models.

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