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arXiv 0910.3945astro-ph.COastro-ph.GA
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宽线区的入流和混响映射的基本限制

Inflow of the Broad-Line Region and the Fundamental Limitations of Reverberation Mapping

C. Martin Gaskell

摘要:

回顾了活动星系核宽线区(BLR)的速度分辨混响映射证据。在不同时期的许多对象中的不同线给出了一致的BLR运动的图片。运动主要由维里化运动(旋转加湍流)和显著的净流入控制。BLR的质量流入足以为AGN提供动力。随着电离势的增加,谱线的蓝移增加,这是下落物质散射的结果。窄线塞弗特1s中紫外线的高蓝移是由于增强的BLR流入率而不是强风。表面上相互矛盾的情况下,明显流出混响映射签名的轴对称假设的混响映射的故障的结果。这种崩溃有几个可能的原因:高能量的变化往往是本质上各向异性的,变化的区域必然位于离轴,X射线观测揭示了靠近黑洞的视线柱密度的重大变化。由单一事件主导的混响映射活动的结果需要谨慎对待。

英文摘要:

The evidence from velocity-resolved reverberation mapping showing a net infall of the broad-line region (BLR) of AGNs is reviewed. Different lines in many objects at different epochs give a consistent picture of BLR motions. The motions are dominated by virialized motion (rotation plus turbulence) with significant net inflow. The BLR mass influx is sufficient to power the AGN. The increasing blueshifting of lines with increasing ionization potential is a consequence of scattering off infalling material. The high blueshiftings of the UV lines in Narrow-Line Seyfert 1s are due to enhanced BLR inflow rates rather than strong winds. Seemingly conflicting cases of apparent outflow reverberation mapping signatures are a result of the breakdown of the axial-symmetry assumption in reverberation mapping. There are several plausible causes of this breakdown: high-energy variability tends to be intrinsically anisotropic, regions of variability are necessarily located off-axis, and X-ray observations reveal major changes in line-of-sight column densities close to the black hole. Results from reverberation mapping campaigns dominated by a single event need to be treated with caution.

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