Measuring the Sizes of the Emission Regions of Quasars PG1115+080 and RXJ 1131-1231

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We present results from an ongoing monitoring campaign performed with the Chandra X-ray Observatory of the gravitational lensed quasars PG 1115+080 and RXJ 1131-1231. We report the detection of significant variability in several of the lensed images. The variability of the images is uncorrelated with that of the other images implying that quasar intrinsic variability is not the cause of the observed variability. We interpret the uncorrelated variability of the images as the result of microlensing. As the light-curves of the images of PG 1115+080 and RXJ 1131-1231 are being extended with the ongoing monitoring observations of these objects we are confirming our previous results of the sizes of the X-ray and UV /optical emission regions and are reducing the uncertainties of these size scales. By coadding all available observations of PG 1115 and RXJ 1131 we are able to better characterize the massive foreground cluster near RXJ 1131 and the group of galaxies near PG 1115 and limit the fluxes of any central odd images.

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