The Influence of Gravitational Microlensing on the Broad Emission Lines of Quasars
The Influence of Gravitational Microlensing on the Broad Emission Lines of Quasars
复制标题
引力微透镜对类星体宽发射线的影响
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
A. Oscoz
中科院分区：
文献类型：
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作者：
C. Abajas;E. Mediavilla;J. A. Muñoz;L. Č. Popović;A. Oscoz
我们根据最近确定的宽线区域 (BLR) 大小及其随 QSO 光度的缩放，讨论微透镜对 QSO 的宽发射线 (BEL) 的影响。恒星大小物体的微透镜作用可以在一些多重成像 QSO 的 BEL 中产生显着的放大，并且可能与高电离谱线非常相关。我们已经确定了一组 10 个引力透镜系统（约占所选样本的 30%），其中可以观察到微透镜。使用活动星系核的标准运动学模型，我们研究了位于相对于 BLR 中心不同位置的微透镜引起的线轮廓变化。我们发现微透镜可以产生重要的效果，例如线轮廓不同部分的相对增强或线峰的位移。研究微透镜 QSO 图像中不同电离的 BEL 轮廓可能是探测 BLR 结构和尺寸的另一种方法。
We discuss the effects of microlensing on the broad emission lines (BELs) of QSOs in the light of recent determinations of the size of the broad-line region (BLR) and its scaling with QSO luminosity. Microlensing by star-sized objects can produce significant amplifications in the BEL of some multiple-imaged QSOs, and could be very relevant for high-ionization lines. We have identified a group of 10 gravitational lens systems (~30% of the selected sample) in which microlensing could be observed. Using standard kinematic models for active galactic nuclei, we have studied the changes induced in the line profile by a microlens located at different positions with respect to the center of the BLR. We found that microlensing could produce important effects such as the relative enhancement of different parts of the line profile or the displacement of the peak of the line. The study of BEL profiles of different ionization in a microlensed QSO image could be an alternative method for probing the BLR structure and size.