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L.C. Gallo, W.F. Welsh (San Diego State University)
``Echo mapping'' is a technique that uses time delays between continuum variations and emission line variations to measure the geometry of the gas inside an AGN. The technique is immensely powerful, but the results so far have been modest due to relatively low quality data (``low'' meaning undersampled and inadequate S/N). To remedy these deficiencies, the ``HET Echo Mapping Project'' was created. The queue--scheduled 9m Hobby--Eberly Telescope (HET) is ideal for echo mapping.
In 2000 June--July an AGN Watch Campaign on Arakelian 564 (a NLSy 1) took place, involving HST, RXTE, ASCA, Chandra, and XMM. During this time we obtained 12 low--res spectra of Akn 564 with the HET. We present these spectra along with initial interpretation of the variations. We also present data from other echo mapping projects being carried out with the HET.