X-ray and optical flux ratio anomalies in quadruply lensed quasars. II. Mapping the dark matter content in elliptical galaxies
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 matte...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
Institute of Physics Publishing
2012
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| Online Access: | http://hdl.handle.net/1721.1/70981 https://orcid.org/0000-0002-5665-4172 https://orcid.org/0000-0003-3182-5569 |
| Summary: | 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] . |
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