Iron-Line Emission as a Probe of Bardeen-Petterson Accretion Disks
Iron-Line Emission as a Probe of Bardeen-Petterson Accretion Disks
复制标题
铁线发射作为巴丁-佩特森吸积盘的探针
DOI：
10.1086/491616
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Eric P. Vandernoot
中科院分区：
文献类型：
--
作者：
P. C. Fragile;W. Miller;Eric P. Vandernoot
在这项工作中，我们证明了Bardeen-Petterson吸积盘可以在相对加宽的发射线轮廓中显示出独特的、可探测的特征。一些独特的特征包括倒置的线条轮廓，具有更尖锐的红角和更柔和的蓝角，甚至轮廓具有来自单个静止框架线的两个以上的角。我们通过使用简单的两分量圆盘模型构造一系列合成的线轮廓来演示这些点。我们发现，所得到的轮廓对两个关键参数非常敏感，即Bardeen-Petterson跃迁半径RBP和两个圆盘分量在可能的值范围内的相对倾斜β[10≤RBP/(Gm/c2)≤40，15°≤β≤45°]。我们利用我们的发现表明，在塞弗特1星系MCG-6-30-15光谱中观察到的一些“额外”谱线特征可能归因于Bardeen-Petterson盘结构。同样，我们将我们的发现应用于两个可能的Bardeen-Petterson候选银河系黑洞，Gro J1655-40和XTE J1550-564。我们使用观测受限的参数集提供了这些系统的合成线轮廓。虽然我们没有正式地拟合这些系统的数据，但我们确认我们的合成光谱与当前的观测结果是一致的。
In this work we show that Bardeen-Petterson accretion disks can exhibit unique, detectable features in relativistically broadened emission line profiles. Some of the unique characteristics include inverted line profiles with sharper red horns and softer blue horns and even profiles with more than two horns from a single rest-frame line. We demonstrate these points by constructing a series of synthetic line profiles using simple two-component disk models. We find that the resulting profiles are very sensitive to the two key parameters one would like to constrain, namely, the Bardeen-Petterson transition radius rBP and the relative tilt β between the two disk components over a range of likely values [10 ≤ rBP/(GM/c2) ≤ 40, 15° ≤ β ≤ 45°]. We use our findings to show that some of the "extra" line features observed in the spectrum of the Seyfert 1 galaxy MCG -6-30-15 may be attributable to a Bardeen-Petterson disk structure. Similarly, we apply our findings to two likely Bardeen-Petterson candidate Galactic black holes, GRO J1655-40 and XTE J1550-564. We provide synthetic line profiles of these systems using observationally constrained sets of parameters. Although we do not formally fit the data for any of these systems, we confirm that our synthetic spectra are consistent with current observations.