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arXiv 1107.2391astro-ph.HE
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小天鹅座微类星体X-1的研究进展

The Microquasar Cyg X-1: A Short Review

Michael A. Nowak, Joern Wilms, Katja Pottschmidt, Sera Markoff

摘要:

我们回顾了黑洞候选者天鹅座X-1的光谱特性。具体来说,我们讨论了两组最近的多卫星观测。其中一个包含0.5-500 keV的光谱,是当时每颗飞行的X射线卫星获得的,这是迄今为止观测到的最难的Cyg X-1光谱之一。第二组由0.5-40 keV Chandra-HETG加上RXTE-PCA光谱组成,来自无线电安静的光谱软态。我们首先讨论在天鹅座X-1的研究中经常被忽视的“混乱的天体物理学”,即,次级风和前景尘埃散射晕的电离吸收。然后,我们讨论了两个极端状态的共同组成部分:一个低温吸积盘,和相对论加宽的Fe线和反射。硬态谱模型表明,磁盘内边缘不会延伸超过~40 GM/c^2,甚至可能接近~6 GM/c^2。软态显示出一个更为突出的圆盘成分;然而,它非常低的标准化值合理地表明天鹅座X-1系统中存在一个旋转的黑洞。

英文摘要:

We review the spectral properties of the black hole candidate Cygnus X-1. Specifically, we discuss two recent sets of multi-satellite observations. One comprises a 0.5-500 keV spectrum, obtained with every flying X-ray satellite at that time, that is among the hardest Cyg X-1 spectra observed to date. The second set is comprised of 0.5-40 keV Chandra-HETG plus RXTE-PCA spectra from a radio-quiet, spectrally soft state. We first discuss the "messy astrophysics" often neglected in the study of Cyg X-1, i.e., ionized absorption from the wind of the secondary and the foreground dust scattering halo. We then discuss components common to both state extremes: a low temperature accretion disk, and a relativistically broadened Fe line and reflection. Hard state spectral models indicate that the disk inner edge does not extend beyond ~40 GM/c^2, and may even approach as close as ~6 GM/c^2. The soft state exhibits a much more prominent disk component; however, its very low normalization plausibly indicates a spinning black hole in the Cyg X-1 system.

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