Reverberation mapping and the disk wind model of the broad line region
Reverberation mapping and the disk wind model of the broad line region
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DOI：
10.1086/177543
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发表时间：
1995-11
期刊：
影响因子：
--
通讯作者：
J. Chiang;N. Murray
中科院分区：
文献类型：
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作者：
J. Chiang;N. Murray
利用Murray等人（1995）的盘风模型，我们计算了在辐射驱动风存在下活动星系核吸积盘表面宽线辐射的谱线轮廓和频率分辨响应函数。我们发现，在风中的剪切和在磁盘本身产生各向异性的线发射，解决了几个众所周知的问题与磁盘模型的宽线区域的综合影响。特别是，共振线的加宽，如\Civ，\Lya和\Nv\/可以归因于在塞弗茨半径接近$\sim 10^{16}$~cm的圆盘气体的轨道运动，而不需要不切实际的大发射区域，以产生单峰轮廓。此外，各向异性的线发射的结果，在频率相关的响应函数，不再是红-蓝对称的，从而推断的时间延迟的各种红色和蓝色的成分的线同意定性与最近的混响映射观测NGC~5548。
Using the disk wind model of Murray et al. (1995), we calculate line profiles and frequency-resolved response functions for broad line emission from the surface of an accretion disk in an AGN in the presence of a radiatively driven wind. We find that the combined effects of the shears in the wind and in the disk itself produce anisotropic line emission which solves several well-known problems connected with disk models of the broad line region. In particular, the broadening of resonance lines such as \Civ, \Lya, and \Nv\/ can be attributed to orbital motion of the disk gas at radii as close as $\sim 10^{16}$~cm in Seyferts without requiring unrealistically large emission regions in order to produce single-peaked profiles. Furthermore, the anisotropy of the line emission results in frequency-dependent response functions which are no longer red-blue symmetric so that the time delays inferred for the various red and blue components of the line agree qualitatively with recent reverberation mapping observations of NGC~5548.