发光类星体RBS 1124的X射线发射是否起源于温和的相对论流出日冕？
Does the X-ray emission of the luminous quasar RBS 1124 originate in a mildly relativistic outflowing corona?
摘要：
我们用朱雀星观测到了一颗亮（L_x ~ 6 × 10^44erg/s）射电宁静类星体RBS 1124（z=0.208）。我们报告了一个中等宽的铁（Fe）线和弱的软X射线过剩的检测。X射线数据可以很好地用一个简单的模型来描述，该模型包括幂律X射线连续谱加上它在吸积盘上的反射。如果我们测量到的内部圆盘半径（<=3.8引力半径）与黑洞时空的最内部稳定圆形轨道一致，我们就可以推断，为RBS 1124提供动力的黑洞正在以自旋a>= 0.6的速度快速旋转。在0.5-2 keV波段的软过剩贡献约为15%，大约是在未遮蔽的Seyfert 1星系和类星体中通常观察到的软过剩贡献的一半，这与我们测量的低圆盘反射分数（R_disc ~0.4）一致。低反射率不能由盘截断驱动，这不仅与我们推断的小的内部盘半径不一致，而且最重要的是，与源的辐射有效性质（L_Bol / L_Edd ~1）不一致。一个合理的解释是，X射线日冕是一个失败的喷流的基础（RBS 1124是无线电安静的），实际上是以温和的相对论速度流出。像差减少了圆盘的辐射，因此迫使低于标准的反射分数，并将推断的源固有光度减半，将推导的爱丁顿比从~ 1降低到~0.5。[删节]
英文摘要：
We have observed the luminous (L_x ~ 6x10^44 erg/s) radio-quiet quasar RBS 1124 (z=0.208) with Suzaku. We report the detection of a moderately broad iron (Fe) line and of a weak soft X-ray excess. The X-ray data are very well described by a simple model comprising a power law X-ray continuum plus its reflection off the accretion disc. If the inner disc radius we measure (<=3.8 gravitational radii) is identified with the innermost stable circular orbit of the black hole spacetime, we infer that the black hole powering RBS 1124 is rotating rapidly with spin a>= 0.6. The soft excess contribution in the 0.5-2 keV band is ~15%, about half than that typically observed in unobscured Seyfert 1 galaxies and quasars, in line with the low disc reflection fraction we measure (R_disc ~0.4). The low reflection fraction cannot be driven by disc truncation which is at odds not only with the small inner disc radius we infer but, most importantly, with the radiatively efficient nature of the source (L_Bol / L_Edd ~1). A plausible explanation is that the X-ray corona is the base of a failed jet (RBS 1124 being radio-quiet) and actually outflowing at mildly relativistic speeds. Aberration reduces the irradiation of the disc, thus forcing a lower than standard reflection fraction, and halves the inferred source intrinsic luminosity, reducing the derived Eddington ratio from ~1to ~0.5. [abridged]
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
