论文标题
使用Astrosat的GRS 1915+105的心跳状态上的时间分辨光谱
Time-resolved spectroscopy on the heartbeat state of GRS 1915+105 using AstroSat
论文作者
论文摘要
在心跳状态下，黑洞系统GRS 1915+105的Astrosat光谱（振荡周期从150到100秒不同），并使用截短的相对论盘模型以及组分分量分析。拟合光谱的长度约为24秒。振荡可以描述为增生速率的协调变化，成熟的通量和内圆盘半径，后者范围为1.235-5引力半径。与$χ$和中间状态的结果相比，尽管吸积率和高能量光子指数相似，但这些状态的内盘半径和成分光子的比例大于心跳。冠状效率$η\ equiv l_ {ac}/\ dot m c^2 $，其中$ l_ {ac} $是Corona中产生的辐射光度，大约是$ \ propto \ dot \ dot m^{ - 2/3} $。效率随着心跳状态的内部半径降低，但对于$χ$和内部半径较大的中间状态具有相似的值。讨论了这些结果的含义。
AstroSat spectra of the black hole system GRS 1915+105 during the heartbeat state (with a varying oscillation period from 150 to 100 secs) were analysed using a truncated relativistic disc model along with a Comptonization component. Spectra were fitted for segments of length ~ 24 secs. The oscillation can be described as coordinated variations of the accretion rate, Comptonised flux, and the inner disc radius, with the latter ranging from 1.235-5 gravitational radii. Comparison with results from the $χ$ and Intermediate states shows that while the accretion rate and the high energy photon index were similar, the inner disc radius and the fraction of Comptonised photons were larger for these states than for the heartbeat one. The coronal efficiency $η\equiv L_{ac}/\dot M c^2$, where $L_{ac}$ is the radiative luminosity generated in the corona is found to be approximately $\propto \dot M^{-2/3}$ for all the observations. The efficiency decreases with inner radii for the heartbeat state but has similar values for the $χ$ and Intermediate states where the inner radii is larger. The implications of these results are discussed.
