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We present results from a monitoring campaign performed with the ChandraX-ray Observatory of the gravitationally lensed quasars RX J1131-1231 and HE1104-1805. We detect significant X-ray variability in all images of bothquasars. The flux variability detected in image A of RX J1131-1231 is ofparticular interest because of its high amplitude (a factor of ~ 20). Weinterpret it as arising from microlensing since the variability is uncorrelatedwith that of the other images and the X-ray flux ratios show larger changesthan the optical as we would expect for microlensing of the more compact X-rayemission regions. The differences between the X-ray and optical flux ratios ofHE 1104-1805 are less dramatic, but there is no significant soft X-ray or dustabsorption, implying the presence of X-ray microlensing in this system as well.Combining the X-ray data with the optical light curves we find that the X-rayemitting region of HE 1104-1805 is compact with a half-light radius ~ 6 r_g,where the gravitational radius is r_g = 3.6 x 10^14 cm, thus placingsignificant constraints on AGN corona models. We also find that themicrolensing in HE 1104-1805 favors mass models for the lens galaxy that aredominated by dark matter. Finally, we better characterize the massiveforeground cluster near RX J1131-1231, set limits on other sources of extendedX-ray emission, and limit the fluxes of any central odd images to be 30-50 (3sigma) times fainter than the observed images.

X-ray Microlensing in RXJ1131-1231 and HE1104-1805