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arXiv astro-ph/0209020astro-ph
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Her X-1的XMM-牛顿EPIC观测

XMM-Newton EPIC observations of Her X-1

Gavin Ramsay, Silvia Zane, Mario Jimenez-Garate, Jan-Willem den Herder, C. Hailey

摘要:

本文介绍了利用XMM-Newton上的EPIC探测器获得的中子星双星Her X-1的自旋分辨X射线数据。这些数据是在35天岁差周期的三个不同时期采集的。这个源的能量依赖的光变曲线从一个时期到另一个时期变化很大。已知软X射线(<1 keV)和硬X射线(> 2keV)的相对相位变化。在这里,我们发现,软,硬带之间的相移在主状态是相当不同的,从过去观察到的。此外,在其他两次观察期间,它继续发生重大变化。这表明,我们第一次观察到,它的实质性和连续的变化,在倾斜的磁盘,因为它是预期的,如果吸积盘是旋进的系统。对自旋分辨数据的分析证实,在6.4keV处的Fe-K荧光线的等效宽度随主态软X射线发射的变化而变化,从而表明Fe-K线和热分量有共同的起源.当源最亮时,Fe K线相当宽。

英文摘要:

We present spin-resolved X-ray data of the neutron star binary Her X-1 taken using the EPIC detectors on XMM-Newton. The data were taken at three distinct epochs through the 35 day precession period. The energy dependent light curves of this source vary significantly from epoch to epoch. It is known that the relative phasing of the soft (<1 keV) and hard (>2 keV) X-rays varies. Here, we find that the phase shift between the soft and hard bands during the main-on state is considerably different from that observed in the past. Further, it continues to change significantly during the other two observations. This suggests that we are observing, for the first time, a it substantial and continuous variation in the tilt of the disk, as it is expected if the accretion disk is precessing in the system. Analysis of the spin resolved data confirms that the equivalent width variation of the fluorescence Fe K line at \~6.4 keV follows that of the soft X-ray emission in the main-on state, thus suggesting a common origin for Fe K line and thermal component. The Fe K line is considerably broader when the source is brightest.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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