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arXiv 0710.3454astro-ph
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用QPO测量黑洞的质量和自旋

Measurement of Mass and Spin of Black Holes with QPOs

B. Aschenbach

摘要:

现在有四个低质量的X射线双星与黑洞,显示双共振类HFQPO。在Sgr A* 中可能发现了类似的QPO。我回顾了迄今为止发表的Sgr A* 的三个X射线耀斑和六个NIR耀斑的功率谱密度分布,以寻找更多的相似之处,而不仅仅是微类星体黑洞和Sgr A* 之间的频率。以相同的方法重新分析了Sgr A* 的三个X射线耀斑,并给出了1100 s左右报告周期的功率密度分布的白噪声概率。综述了利用反常轨道速度效应的共振理论的进展。

英文摘要:

There are now four low mass X-ray binaries with black holes which show twin resonant-like HFQPOs. Similar QPOs might have been found in Sgr A*. I review the power spectral density distributions of the three X-ray flares and the six NIR flares published for Sgr A* so far, in order to look for more similarities than just the frequencies between the microquasar black holes and Sgr A*. The three X-ray flares of Sgr A* are re-analysed in an identical way and white noise probabilities from their power density distributions are given for the periods reported around 1100 s. Progress of the resonant theory using the anomalous orbital velocity effect is summarized.

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