用RXTE寻找Cyg X-1中的死亡脉冲串
A Search for Dying Pulse Trains in Cyg X-1 using RXTE
摘要：
广义相对论预言，在围绕黑洞的吸积盘中，物质从最后一个稳定轨道脱离后螺旋进入事件视界时，会产生强度逐渐减小、间隔逐渐减小的垂死脉冲串（Dying pulse trains，DPT）。在使用哈勃太空望远镜上的高速光度计对天鹅座X-1进行的3小时远紫外观测中，发现了两个类似于DPT的事件（Dolan，2001年）。利用RXTE上的正比计数器阵列对天鹅座X-1进行了低能X射线观测。在Cyg X-1的高亮度状态、低亮度状态和状态之间的转换期间，在10小时的观测中没有检测到脉冲之间具有1 - 40 ms特征时间尺度的垂死脉冲串，尽管在1 ms时间分辨率的数据中可以清楚地检测到单个脉冲。X射线区域中DPT发生率的2 σ上限小于Dolan（2001）报告的UV发生率的一半。这些否定的结果与天鹅座X-1是一个极端的克尔黑洞，DPT脉冲之间的特征时间尺度小于1毫秒是一致的。
英文摘要：
Dying pulse trains (DPTs) pulses of radiation with decreasing intensity and decreasing intervals between them are predicted by General Relativity to occur from material spiraling into an event horizon after detaching from the last stable orbit in an accretion disk around a black hole. Two events resembling DPTs were detected in 3 hours observation of Cyg X-1 in the far UV using the High Speed Photometer on the Hubble Space Telescope (Dolan 2001). We observed Cyg X-1, a leading candidate for a black hole, with the proportional counter array on RXTE to seek such events in the low-energy X-ray region. No dying pulse trains with a characteristic timescale between pulses of 1 - 40 ms were detected in 10 hours of observation during Cyg X-1s high luminosity state, low luminosity state, and transitions between states, although individual pulses are clearly detectable in data with 1 ms temporal resolution. The 2 sigma upper limit on the rate of DPTs in the X-ray region is less than half the rate reported by Dolan (2001) in the UV. These negative results are consistent with Cyg X-1 being an extreme Kerr black hole with a characteristic timescale between DPT pulses less than 1 ms.
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