X-Ray and Optical Flux Ratio Anomalies in Quadruply Lensed Quasars

Details X-Ray and Optical Flux Ratio Anomalies in Quadruply Lensed Quasars X-Ray and Optical Flux Ratio Anomalies in Quadruply Lensed Quasars

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21011306p&link_type=abstract

American Astronomical Society Meeting 210, #113.06; Bulletin of the American Astronomical Society, Vol. 39, p.238

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, corresponding to scale sizes of 10^2-10^4 gravitational radii of the central black hole. This high angular resolution is achieved by taking advantage of microlensing by stars in the lensing galaxy. I will discuss X-ray observations of ten lensed quasars recorded with the Chandra X-ray Observatory as well as corresponding optical data obtained with either the Hubble Space Telescope or ground-based telescopes. These were 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 typically larger than expected from basic thin disk models by factors of 3-30.

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