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   62114
   An exciting development in our understanding of the AGN phenomenon has
   been the observation of broad, redshifted emission lines in Seyfert 1
   galaxies. These lines arise close to the event horizon of the central
   black hole, probably in the innermost regions of an accretion disk.
   Further progress in our knowledge of the structure and dynamics in the
   black hole environment can be made by studying the line variability. We
   propose to monitor short time scale variations in the line flux and
   profile in NGC 3516 which is known to show continuum and line
   variability. Such observations represent the first attempts at mapping
   the central regions of AGN, shedding light on the fundamental
   parameters of the system and providing new insights into the nature of
   the central engine.
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