STATISTICS OF MICROLENSING CAUSTIC CROSSINGS IN Q 2237+0305: PECULIAR VELOCITY OF THE LENS GALAXY AND ACCRETION DISK SIZE
STATISTICS OF MICROLENSING CAUSTIC CROSSINGS IN Q 2237+0305: PECULIAR VELOCITY OF THE LENS GALAXY AND ACCRETION DISK SIZE
复制标题
Q 2237 0305 中微透镜焦散线的统计：透镜星系的奇异速度和吸积盘大小
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
O. Ariza
中科院分区：
文献类型：
--
作者：
E. Mediavilla;E. Mediavilla;J. Jiménez;J. A. Muñoz;T. Mediavilla;O. Ariza
本文利用透镜系统Q 2237+0305中微透镜效应引起的焦散渡统计，研究了透镜星系的特有速度。我们计算了一系列恒星质量函数的焦散穿越率，并发现平均焦散穿越次数与有效横向速度和平均质量的依赖关系，相当于相同质量微透镜情况下的理论预测。我们利用Q2237 +0305的四个图像的2012年光学引力透镜实验监测来探索测量veff的方法的可能性。为了确定veff的下限，我们保守地计算文献中确定的四个高放大倍数事件（加上我们提出的一个额外事件）中每一个的单个焦散交叉，获得68%的置信度。从这个值和平均FWHM的四个高放大率的事件，我们得到了一个下限的光天的半径的源（rs = FWHM/2.35）。初步确定三个额外的焦散交叉事件导致的有效横向速度和光源大小的光天的估计。估计的银河系的横向特有速度为。
We use the statistics of caustic crossings induced by microlensing in the lens system Q 2237+0305 to study the lens galaxy peculiar velocity. We calculate the caustic crossing rates for a comprehensive family of stellar mass functions and find a dependence of the average number of caustic crossings with the effective transverse velocity and the average mass, , equivalent to the theoretical prediction for the case of microlenses with identical masses. We explore the possibilities of the method to measure veff using the ∼12 yr of Optical Gravitational Lensing Experiment monitoring of the four images of Q 2237+0305. To determine a lower limit for veff, we count, conservatively, a single caustic crossing for each one of the four high magnification events identified in the literature (plus one additional proposed by us) obtaining at 68% of confidence. From this value and the average FWHM of the four high magnification events, we obtain a lower limit of light-days for the radius of the source (rs = FWHM/2.35). Tentative identification of three additional caustic crossing events leads to estimates of for the effective transverse velocity and of light-days for the source size. The estimated transverse peculiar velocity of the galaxy is .