X-ray and optical flux ratio anomalies in quadruply lensed quasars. II. Mapping the dark matter content in elliptical galaxies
Author(s)Pooley, David; Rappaport, Saul A.; Blackburne, Jeffrey A.; Schechter, Paul L.; Wambsganss, Joachim
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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 R[subscript c] of 6.6 kpc from the center of the lensing galaxy. We divide the systems into smaller ensembles based on R[subscript c] and find that the most likely local stellar fraction varies qualitatively and quantitatively as expected, decreasing as a function of R[subscript c] .
DepartmentKavli Institute for Astrophysics and Space Research; Massachusetts Institute of Technology. Department of Physics
Institute of Physics Publishing
Pooley, David et al. “X-ray and Optical Flux Ratio Anomalies in Quadruply Lensed Quasars. Ii. Mapping the Dark Matter Content in Elliptical Galaxies.” The Astrophysical Journal 744.2 (2012): 111. Web.
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