武仙座X-1中回旋线能量的连续衰减
Continued decay in the cyclotron line energy in Hercules X-1
摘要：
在双星X射线脉冲星Her X-1的光谱中，回旋线的质心能量Ecyc被发现在几十年的时间尺度上随着时间的推移而减少--这在天体物理学上是惊人的短。这是发现脉冲相位平均线质心能量使用观测数据从各种X射线卫星在1996年至2012年的时间框架，建立约4千电子伏的减少。在这里，我们报告了NuSTAR在2015年8月进行的新观测结果。早期的结果得到证实和加强，相对于这两个，依赖于通量的Ecyc（它仍然存在于2006年后）和依赖于时间：长期衰变继续以相同的速率，对应于减少约5千电子伏在20年。
英文摘要：
The centroid energy Ecyc of the cyclotron line in the spectrum of the binary X-ray pulsar Her X-1 had been found to decrease with time on a time scale of a few tens of years - surprisingly short astrophysically. This was found for the pulse phase averaged line centroid energy using observational data from various X-ray satellites over the time frame 1996 to 2012, establishing a reduction of about 4 keV. Here we report on the result of a new observation by NuSTAR performed in August 2015. The earlier results are confirmed and strengthened, with respect to both, the dependence of Ecyc on flux (it is still present after 2006) and the dependence on time: the long-term decay continued with the same rate, corresponding to a reduction of about 5 keV in 20 years.
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