Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1002p&link_type=abstract
American Astronomical Society, HEAD meeting #9, #10.02; Bulletin of the American Astronomical Society, Vol. 38, p.364
Astronomy and Astrophysics
Astronomy
Scientific paper
X-ray and optical observations of quadruply lensed quasars can provide a micro-arcsecond probe of the lensed quasar as well as provide information on the ratio of baryonic to dark matter in the lensing galaxy. We utilize X-ray observations of ten lensed quasars recorded with Chandra as well as corresponding optical data recorded by either Hubble or ground-based optical telescopes. These are analyzed in a systematic and uniform way with emphasis on the flux-ratio anomalies that are found relative to the predictions of smooth lens models. A comparison of the flux ratio anomalies between the X-ray and optical bands allows us to conclude that the optical emission regions of the lensed quasars are much larger than expected from basic disk models (by factors of ˜10-100). We also conclude that the lensing galaxies, as a group, contain a substantial amount of dark matter in the vicinity of the Einstein radius (i.e., at distances of ˜5-10 kpc from the galaxy centers).
Blackburne Jeffery A.
Pooley David A.
Rappaport Saul
Schechter Paul L.
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