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We present a microlensing analysis of 61 Chandra observations of 14 quadruplylensed quasars. X-ray flux measurements of the individual quasar images give aclean determination of the microlensing effects in the lensing galaxy and thusoffer a direct assessment of the local fraction of stellar matter making up thetotal integrated mass along the lines of sight through the lensing galaxy. ABayesian analysis of the ensemble of lensing galaxies gives a most likely localstellar fraction of 7%, with the other 93% in a smooth, dark matter component,at an average impact parameter R_c of 6.6 kpc from the center of the lensinggalaxy. We divide the systems into smaller ensembles based on R_c and find thatthe most likely local stellar fraction varies qualitatively and quantitativelyas expected, decreasing as a function of R_c.

X-Ray And Optical Flux Ratio Anomalies In Quadruply Lensed Quasars. II. Mapping the Dark Matter Content in Elliptical Galaxies