论文标题
X射线在AGN和微Quasar中浸入 - 内积盘的塌陷时间尺度
X-ray Dips in AGN and Microquasars -- Collapse Timescales of Inner Accretion Disc
论文作者
论文摘要
人们认为，来自某些AGN和微QuaSar的X射线的时间行为被认为是由于其积聚盘的热，内部部分的快速崩溃而产生的。塌陷可能发生在径向内部积聚盘的径向内部时间尺度上。但是，由于缺乏对包含内盘的无碰撞血浆中的手术粘度的了解，因此阻碍了该时间尺度的估计。我们使用公开的模拟结果通过湍流磁场进行宇宙射线扩散，以达到适合热吸积盘的粘度处方。我们使用此粘度处方构建简化的光盘模型，并估算3C 120、3C 111和GRS 1915+105的盘式塌陷时间表。由我们的模型产生的Shakura-Sunyaevα参数范围为0.02至0.08。我们的内部光盘塌陷时间尺度估计与观察到的X射线倾角的估计非常吻合。我们发现，塌陷时间尺度对热积聚盘的外半径最敏感。
The temporal behaviour of X-rays from some AGN and microquasars is thought to arise from the rapid collapse of the hot, inner parts of their accretion discs. The collapse can occur over the radial infall timescale of the inner accretion disc. However, estimates of this timescale are hindered by a lack of knowledge of the operative viscosity in the collisionless plasma comprising the inner disc. We use published simulation results for cosmic ray diffusion through turbulent magnetic fields to arrive at a viscosity prescription appropriate to hot accretion discs. We construct simplified disc models using this viscosity prescription and estimate disc collapse timescales for 3C 120, 3C 111, and GRS 1915+105. The Shakura-Sunyaev α parameter resulting from our model ranges from 0.02 to 0.08. Our inner disc collapse timescale estimates agree well with those of the observed X-ray dips. We find that the collapse timescale is most sensitive to the outer radius of the hot accretion disc.
