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The quadruply lensed quasar HE0435-1223 shows a clear microlensing effectthat affects differently the blue and red wings of the H$\alpha$ line profilein its image D. To interpret these observations, and constrain the broademission line region (BLR) properties, the effect of gravitational microlensingon quasar broad emission line profiles and their underlying continuum has beensimulated considering representative BLR models and microlensing magnificationmaps. The amplification and distortion of the H$\alpha$ line profile,characterized by a set of four indices, can be reproduced by the simulations.Although the constraints on the BLR models set by the observed single-epochmicrolensing signal are not very robust, we found that flattened geometries(Keplerian disk and equatorial wind) can more easily reproduce the observedline profile deformations than a biconical polar wind. With an additionalindependent constraint on the size of the continuum source, the Keplerian diskmodel of the H$\alpha$ BLR is slightly favored.

astronomy and astrophysics

Constraining the geometry and kinematics of the quasar broad emission  line region using gravitational microlensing. II. Comparing models with  observations in the lensed quasar HE0435-1223