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We measure the differential microlensing of the broad emission lines between18 quasar image pairs in 16 gravitational lenses. We find that high ionizationlines such as CIV are more strongly microlensed than low ionization lines,indicating that the high ionization line emission regions are more compact. Ifwe statistically model the distribution of microlensing magnifications, weobtain estimates for the broad line region radius of 24 (-15/+22) and 55(-35/+150) light-days (90% confidence) for the high and low ionization lines,respectively. When the sample is divided attending to quasar luminosity, wefind that the line emission regions of more luminous quasars are larger, with aslope consistent with the expected scaling from photoionization models. Ourestimates also agree well with the results from local reveberation mappingstudies.

Microlensing of Quasar Broad Emission Lines: Constraints on Broad Line Region Size