X-RAY AND OPTICAL FLUX RATIO ANOMALIES IN QUADRUPLY LENSED QUASARS. II. MAPPING THE DARK MATTER CONTENT IN ELLIPTICAL GALAXIES
X-RAY AND OPTICAL FLUX RATIO ANOMALIES IN QUADRUPLY LENSED QUASARS. II. MAPPING THE DARK MATTER CONTENT IN ELLIPTICAL GALAXIES
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四透镜类星体中的 X 射线和光通量比异常。
DOI：
10.1088/0004-637x/744/2/111
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
J. Wambsganss
中科院分区：
文献类型：
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作者：
D. Pooley;S. Rappaport;J. A. Blackburne;P. Schechter;J. Wambsganss
我们对 14 个四透镜类星体的 61 次钱德拉观测结果进行了微透镜分析。对单个类星体图像的 X 射线通量测量可以清楚地确定透镜星系中的微透镜效应，从而直接评估构成沿透镜星系视线的总积分质量的恒星物质的局部部分。对透镜星系群的贝叶斯分析得出，最有可能的局部恒星比例为 7%，其余 93% 为光滑的暗物质成分，距透镜星系中心的平均撞击参数 Rc 为 6.6 kpc。我们根据 Rc 将系统划分为较小的系综，并发现最有可能的局部恒星分数按预期在定性和定量上变化，并随着 Rc 的函数而减少。
We present a microlensing analysis of 61 Chandra observations of 14 quadruply lensed quasars. X-ray flux measurements of the individual quasar images give a clean determination of the microlensing effects in the lensing galaxy and thus offer a direct assessment of the local fraction of stellar matter making up the total integrated mass along the lines of sight through the lensing galaxy. A Bayesian analysis of the ensemble of lensing galaxies gives a most likely local stellar fraction of 7%, with the other 93% in a smooth, dark matter component, at a mean impact parameter Rc of 6.6 kpc from the center of the lensing galaxy. We divide the systems into smaller ensembles based on Rc and find that the most likely local stellar fraction varies qualitatively and quantitatively as expected, decreasing as a function of Rc.