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arXiv 1002.3126astro-ph.CO
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时变吸积盘尺寸对类星体微透镜光变曲线的影响

The Effect of a Time-Varying Accretion Disk Size on Quasar Microlensing Light Curves

Jeffrey A. Blackburne, Christopher S. Kochanek

摘要:

微透镜扰动对引力透镜类星体图像放大率的影响取决于类星体的角大小。如果类星体在可见光波段的变化是由吸积盘面积的变化引起的,它将影响微透镜放大率。我们推导出预期的信号,假设光度与磁盘面积的一些权力的规模,并估计其振幅使用模拟。我们讨论了在现实世界的数据中检测效果的前景,并使用它来估计的光度对磁盘面积的依赖的对数斜率。这样的估计将为标准薄吸积盘模型提供一个直接的检验。我们尝试拟合透镜类星体HE 0435-1223的六个季节的光变曲线,包括这种效应,作为对Kochanek等人(2006)估计时间延迟方法的修改。我们发现一个显着的改善,在拟合优度和相对合理的参数,但一个强大的估计将需要一个完整的数值计算,以正确的模型之间的强相关性的微透镜放大模式的结构和效果的大小。我们还简要地评论这种现象的稳定性的时间延迟估计的影响。

英文摘要:

Microlensing perturbations to the magnification of gravitationally lensed quasar images are dependent on the angular size of the quasar. If quasar variability at visible wavelengths is caused by a change in the area of the accretion disk, it will affect the microlensing magnification. We derive the expected signal, assuming that the luminosity scales with some power of the disk area, and estimate its amplitude using simulations. We discuss the prospects for detecting the effect in real-world data and for using it to estimate the logarithmic slope of the luminosity's dependence on disk area. Such an estimate would provide a direct test of the standard thin accretion disk model. We tried fitting six seasons of the light curves of the lensed quasar HE 0435-1223 including this effect as a modification to the Kochanek et al. (2006) approach to estimating time delays. We find a dramatic improvement in the goodness of fit and relatively plausible parameters, but a robust estimate will require a full numerical calculation in order to correctly model the strong correlations between the structure of the microlensing magnification patterns and the magnitude of the effect. We also comment briefly on the effect of this phenomenon for the stability of time delay estimates.

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