THE MICROLENSING PROPERTIES OF A SAMPLE OF 87 LENSED QUASARS
THE MICROLENSING PROPERTIES OF A SAMPLE OF 87 LENSED QUASARS
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87 个透镜类星体样本的微透镜特性
DOI：
10.1088/0004-637x/738/1/96
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
C. S. Kochanek
中科院分区：
文献类型：
--
作者：
A. Mosquera;C. S. Kochanek
微引力透镜效应是研究类星体吸积盘物理性质和透镜星系暗物质组成和平均质量的有力工具。不幸的是，透镜类星体的数量（1090）超过了我们的监测能力。因此，估计它们的微透镜性质对于确定良好的微透镜候选者以及对于未来调查的期望是重要的。在这项工作中，我们估计了87个透镜类星体样本的微透镜性质。爱因斯坦半径穿越时间尺度的中位数为20.6年，而源穿越时间尺度的中位数为7.3个月。广义上说，这意味着在20 - 10年的时间尺度上，大约一半的透镜将是静止的，源位于一个广泛的缩小的山谷，大约一半将是活跃的，源位于焦散脊。我们还发现，相对于宇宙微波背景偶极子的透镜系统的位置对微透镜时间尺度有适度的影响，理论上微透镜可以用来确认偶极子的运动学起源。作为我们研究的一个推论，我们分析了32个透镜类星体的子样本中的吸积速率参数。在固定的黑洞质量下，可以对宽范围的光度进行采样（即，爱丁顿因素），如果它成为可行的监测暗淡的镜头。
Gravitational microlensing is a powerful tool for probing the physical properties of quasar accretion disks and properties of the lens galaxy such as its dark matter fraction and mean stellar mass. Unfortunately, the number of lensed quasars (∼90) exceeds our monitoring capabilities. Thus, estimating their microlensing properties is important for identifying good microlensing candidates as well as for the expectations of future surveys. In this work, we estimate the microlensing properties of a sample of 87 lensed quasars. While the median Einstein radius crossing timescale is 20.6 years, the median source crossing timescale is 7.3 months. Broadly speaking, this means that on ∼10 year timescales roughly half the lenses will be quiescent, with the source in a broad demagnified valley, and roughly half will be active with the source lying in the caustic ridges. We also found that the location of the lens system relative to the cosmic microwave background dipole has a modest effect on microlensing timescales, and in theory microlensing could be used to confirm the kinematic origin of the dipole. As a corollary of our study we analyzed the accretion rate parameters in a sub-sample of 32 lensed quasars. At fixed black hole mass, it is possible to sample a broad range of luminosities (i.e., Eddington factors) if it becomes feasible to monitor fainter lenses.
影响因子：
6.5
作者：
A. Schulze;L. Wisotzki
通讯作者：
A. Schulze;L. Wisotzki