X-ray and optical flux ratio anomalies in quadruply lensed quasars. II. Mapping the dark matter content in elliptical galaxies

• Main Authors: Pooley, David (Author), Blackburne, Jeffrey A. (Author), Schechter, Paul L. (Contributor), Wambsganss, Joachim (Author), Rappaport, Saul A (Author)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), MIT Kavli Institute for Astrophysics and Space Research (Contributor), Rappaport, Saul A. (Contributor)
• Format: Article
• Language: English
• Published: Institute of Physics Publishing, 2012-06-01T15:32:05Z.
• Subjects: Article
• Online Access: Get fulltext

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] .
National Science Foundation (U.S.) (grant AST-0607601)
United States. National Aeronautics and Space Administration (Chandra grant GO7-8099)