The Influence of Microlensing on Time Delay Determinations in Double-imaged Quasars
The Influence of Microlensing on Time Delay Determinations in Double-imaged Quasars
复制标题
微透镜对双像类星体时滞测定的影响
DOI：
10.1086/305031
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
M. Serra
中科院分区：
文献类型：
--
作者：
L. Goicoechea;A. Oscoz;E. Mediavilla;J. Buitrago;M. Serra
与来自双成像类星体的两条光曲线的互相关函数主峰相关的滞后通常用两个分量之间的时间延迟来识别。然而，短时间尺度的微透镜事件可以独立地修正每个分量的光曲线，并且当存在较强的微透镜时，互相关函数的特征取决于微透镜事件的幅度和形状。这一事实阻止了将与主峰相关联的滞后直接解释为真正的时间延迟。我们提出了一种包括短时间尺度微透镜的光曲线互相关函数的新分析方法。我们讨论了它在1995/1996年Q0957+561光学光度测量中的应用，并确定了从JD 2,450,150到2,450,200可能发生的微透镜事件的趋势。
The lag associated with the main peak of the cross-correlation function of the two light curves arriving from a double-imaged quasar is usually identified with the time delay between the components. However, short-timescale microlensing events can independently modify the light curve of each component, and when strong microlensing is present, the features of the cross-correlation function depend on both amplitude and shape of the microlensing events. This fact prevents a direct interpretation of the lag associated with the main peak as the true time delay. We present a new analysis of the light curves cross-correlation function including short-timescale microlensing. We discuss its application to the 1995/1996 optical photometry of Q0957+561, and determine the trend of a possible microlensing event taking place from JD 2,450,150 to 2,450,200.