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arXiv 1708.07237astro-ph.GAastro-ph.CO
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类星体宽发射线区的风-风模型动力学

The Kinematics of Quasar Broad Emission Line Regions Using a Disk-wind Model

Suk Yee Yong, Rachel L. Webster, Anthea L. King, Nicholas F. Bate, Matthew J. O'Dowd, Kathleen Labrie

摘要:

类星体中宽线区的结构和运动学还没有完全确定。一个流行的BLR模型是盘风模型,它提供了一个基于视角的类星体的几何统一。我们建立了一个简单的运动学盘风模型,具有一个狭窄的出风角。该模型与Sobolev或高速极限中的辐射转移相结合。我们研究视角如何影响观测到的发射线的特性,特别是线宽和速度偏移。线轮廓表现出不同的属性,这取决于方向,风开度角,和区域的风的排放出现。在低倾角(接近正面),我们发现的发射线的形状是不对称的窄宽度和显着的蓝移。随着倾斜角度的增加(接近边缘),线轮廓变得更加对称、更宽,并且蓝移更少。此外,在靠近吸积盘吸积盘的盘风底部附近出现的谱线往往是宽的和对称的。随着风垂直距离的增加,发射线蓝移的相对增加是更大的极地风相比,赤道风。通过考虑风的光学厚度,单峰线轮廓恢复的中间和赤道外流风。该模型能够再现混响映射研究中发现的线路轮廓的红色和蓝色侧的更快响应。在低视角下,在极风和中间风开度角的模型中实现了红色侧的更快响应。蓝边的响应对于在高倾角下看到的赤道风更快。

英文摘要:

The structure and kinematics of the broad line region (BLR) in quasars are still not well established. One popular BLR model is the disk-wind model that offers a geometric unification of a quasar based on the angle of viewing. We construct a simple kinematical disk-wind model with a narrow outflowing wind angle. The model is combined with radiative transfer in the Sobolev, or high velocity, limit. We examine how angle of viewing affects the observed characteristics of the emission line, especially the line widths and velocity offsets. The line profiles exhibit distinct properties depending on the orientation, wind opening angle, and region of the wind where the emission arises. At low inclination angle (close to face-on), we find the shape of the emission line is asymmetric with narrow width and significantly blueshifted. As the inclination angle increases (close to edge-on), the line profile becomes more symmetric, broader, and less blueshifted. Additionally, lines that arise close to the base of the disk wind, near the accretion disk, tend to be broad and symmetric. The relative increase in blueshift of the emission line with increasing wind vertical distance is larger for polar winds compared with equatorial winds. By considering the optical thickness of the wind, single-peaked line profiles are recovered for the intermediate and equatorial outflowing wind. The model is able to reproduce a faster response in either the red and blue sides of the line profile found in reverberation mapping studies. A quicker response in the red side is achieved in the model with a polar wind and intermediate wind opening angle at low viewing angle. The blue side response is faster for an equatorial wind seen at high inclination.

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