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Using infrared spectra of the z = 1.693 quadruply lensed quasar HE0435-1223acquired in 2009 with the spectrograph SINFONI at the ESO Very Large Telescope,we have detected a clear microlensing effect in images A and D. Whilemicrolensing affects the blue and red wings of the H{\alpha} line profile inimage D very differently, it de-magnifies the line core in image A. Thecombination of these different effects sets constraints on the line-emittingregion; these constraints suggest that a rotating ring is at the origin of theH{\alpha} line. Visible spectra obtained in 2004 and 2012 indicate that theMgII line profile is microlensed in the same way as the H{\alpha} line. Ourresults therefore favour flattened geometries for the low-ionizationline-emitting region, for example, a Keplerian disk. Biconical models cannot beruled out but require more fine-tuning. Flux ratios between the differentimages are also derived and confirm flux anomalies with respect to estimatesfrom lens models with smooth mass distributions.

Microlensing of the broad-line region in the quadruply imaged quasar HE0435-1223