一个反常的静止恒星质量黑洞
An Anomalous Quiescent Stellar Mass Black Hole
摘要：
本文给出了对静止恒星质量的黑洞GS 1354-64的40 kS钱德拉观测结果。在该系统的位置处总共检测到266个净计数。由此产生的光谱被发现与以前观察到的静止黑洞的光谱一致，即，光子指数为Γ~ 2的幂律。在0.5 - 10 keV波段推断的光度被发现位于0.5 - 6.5 x 10^{34} erg/s的范围内，其中距离的不确定性是这个大的光度范围的主要来源。尽管如此，这个光度比已知的静态恒星质量黑洞光度分布所预期的要高出一个数量级，这使得GS 1354-64成为唯一一个不符合这个关系的已知恒星质量黑洞。这一观测结果表明，在静止状态下可能存在显著的吸积作用。
英文摘要：
We present the results of a 40 ks Chandra observation of the quiescent stellar mass black hole GS 1354-64. A total of 266 net counts are detected at the position of this system. The resulting spectrum is found to be consistent with the spectra of previously observed quiescent black holes, i.e., a power-law with a photon index of Γ~ 2. The inferred luminosity in the 0.5 -- 10 keV band is found to lie in the range 0.5 - 6.5 x 10^{34} erg/s, where the uncertainty in the distance is the dominant source of this large luminosity range. Nonetheless, this luminosity is over an order of magnitude greater than that expected from the known distribution of quiescent stellar mass black hole luminosities and makes GS 1354-64 the only known stellar mass black hole to disagree with this relation. This observation suggests the possibility of significant accretion persisting in the quiescent state.
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