A Long, Hard Look at the Low/Hard State in Accreting Black Holes
A Long, Hard Look at the Low/Hard State in Accreting Black Holes
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DOI：
10.1086/508644
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发表时间：
2006-02
期刊：
影响因子：
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通讯作者：
J. Miller;J. Homan;D. Steeghs;M. Rupen;R. Hunstead;R. Wijnands;P. Charles;A. Fabian
中科院分区：
文献类型：
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作者：
J. Miller;J. Homan;D. Steeghs;M. Rupen;R. Hunstead;R. Wijnands;P. Charles;A. Fabian
我们提出了协调的银河系黑洞GX 339-4在一个典型的低/硬状态，在2004年爆发期间获得的多波长观测的第一个结果。XMM-Newton观测了两次旋转，或大约280 k; RXTE在整个长时间的凝视中监测了源。由此产生的数据提供了最好的看法，但获得的内部吸积流的几何形状在低/硬状态，这被认为是类似于低光度活动星系核的几何形状。的XMM-牛顿光谱清楚地揭示了一个冷吸积盘组件和相对论性的铁K发射线的存在。两个分量的拟合结果强烈表明，一个标准的薄盘保持在或接近最里面的稳定的圆形轨道，至少在明亮的阶段的低/硬状态。这些研究结果表明，潜在的内部磁盘半径和稳定的紧凑型射流的发病之间的联系，以及在低/硬状态下的径向凹进磁盘的范例，并不普遍。我们的观测结果可以最好地解释，如果一个标准的薄吸积盘燃料的日冕是密切相关的，或一致的，一个紧凑的喷流的基础。在档案数据的简要检查，我们表明，天鹅座X-1支持这张照片的低/硬状态。我们讨论我们的结果的背景下，磁盘喷气连接和流行的模型吸积到黑洞。
We present the first results of coordinated multiwavelength observations of the Galactic black hole GX 339-4 in a canonical low/hard state, obtained during its 2004 outburst. XMM-Newton observed the source for two revolutions, or approximately 280 ks; RXTE monitored the source throughout this long stare. The resulting data offer the best view yet obtained of the inner accretion flow geometry in the low/hard state, which is thought to be analogous to the geometry in low-luminosity active galactic nuclei. The XMM-Newton spectra clearly reveal the presence of a cool accretion disk component and a relativistic Fe K emission line. The results of fits made to both components strongly suggest that a standard thin disk remains at or near to the innermost stable circular orbit, at least in bright phases of the low/hard state. These findings indicate that potential links between the inner disk radius and the onset of a steady compact jet, and the paradigm of a radially recessed disk in the low/hard state, do not hold universally. The results of our observations can best be explained if a standard thin accretion disk fuels a corona that is closely related to, or consistent with, the base of a compact jet. In a brief examination of archival data, we show that Cygnus X-1 supports this picture of the low/hard state. We discuss our results within the context of disk-jet connections and prevailing models for accretion onto black holes.