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We discuss the effects of microlensing on the broad emission lines (BELs) ofQSOs in the light of recent determinations of the size of the broad line region(BLR) and its scaling with QSO luminosity. Microlensing by star-sized objectscan produce significant amplifications in the BEL of some multiple-imaged QSOs,and could be very relevant for high-ionization lines. We have identified agroup of ten gravitational lens systems (30% of the selected sample) in whichmicrolensing could be observed. Using standard kinematic models for AGNs, wehave studied the changes induced in the line profile by a microlens located atdifferent positions with respect to the center of the BLR. We found thatmicrolensing could produce important effects such as the relative enhancementof different parts of the line profile or the displacement of the peak of theline. The study of BEL profiles of different ionization in a microlensed QSOimage could be an alternative method for probing the BLR structure and size.Comment: 41 pages including 20 figures. Accepted for publication in Ap

The Influence of Gravitational Microlensing on the Broad Emission Lines of Quasars