论文标题
识别GRS 1915+105的QPO频率为截断磁盘的相对论动态频率
Identification of QPO frequency of GRS 1915+105 as the relativistic dynamic frequency of a truncated accretion disk
论文作者
论文摘要
当该系统在3.4-5.4 Hz的频率范围内表现出C型准周期振荡（QPOS）时，我们已经分析了银河微分射系统GRS 1915+105的Astrosat观察结果。从同时LAXPC和SXT获得的宽带光谱（1-50 keV）可以通过主要的相对论截短磁盘以及热综合和反射来很好地描述。我们发现，尽管QPO频率取决于散射较大的内部半径，但是当考虑到磁盘的内部半径和积聚速率时，就会获得更紧密的相关性。实际上，该频率随着几十年前的动态频率（即声音交叉时间的倒数）而变化，相对论标准积分磁盘理论的旋转参数为〜0.9。我们表明，由于从Astrosat获得的时空信息的同时宽带光谱覆盖范围，因此可以使用这种识别。
We have analyzed AstroSat observations of the galactic micro-quasar system GRS 1915+105, when the system exhibited C-type Quasi-periodic Oscillations (QPOs) in the frequency range of 3.4-5.4 Hz. The broad band spectra (1-50 keV) obtained from simultaneous LAXPC and SXT can be well described by a dominant relativistic truncated accretion disk along with thermal Comptonization and reflection. We find that while the QPO frequency depends on the inner radii with a large scatter, a much tighter correlation is obtained when both the inner radii and accretion rate of the disk are taken into account. In fact, the frequency varies just as the dynamic frequency (i.e. the inverse of the sound crossing time) as predicted decades ago by the relativistic standard accretion disk theory for a black hole with spin parameter of ~0.9. We show that this identification has been possible due to the simultaneous broad band spectral coverage with temporal information as obtained from AstroSat.
