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The possible gravitational lens amplification of the broad-line region (BLR) of active galactic nuclei (AGNs) by stars in foreground galaxies is studied. For various possible kinematic structures of the BLR, the line shape changes caused by microlensing are generated and classified. Microlensing could significantly enhance the central portion of emission lines emitted from outflow structures and could dramatically amplify the wing region of emission lines that derive from infall structures. Microlensing could also slightly change the redshift of an AGN whose BLR is dominated by Keplerian rotation. Observational consequences of BLR lensing are discussed, including the possible application of this analysis to the quasar pair QSO 1343.4+2640.
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Robert J. Nemiroff (1988) studied this question.
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