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N. A. Grogin, E. J. Schreier, A. M. Koekemoer (STScI), R. Giacconi (AUI/JHU), R. Gilli, L. Kewley, C. Norman (JHU), G. Hasinger (AIP), P. Rosati (ESO), A. Marconi, M. Salvati (Arcetri), P. Tozzi (Trieste)
We present the first results from deep HST/WFPC2 imaging of three fields within the Chandra Deep Field South. We identify the optical counterparts for 90% of the 1~Msec X-ray sources (38 of 42), and these are separated into two distinct classes at optical wavebands: (1) a population of faint sources (I ~24--26) with colors similar to the field population in the same magnitude range, and (2) a brighter group (I < 23) with colors significantly redder than the bright field population. The optically resolved sources in the brighter population have a narrow range of V\!-\!I color and comprise a mix of both late- and early-type galaxies at moderate redshifts (z ~0.3--1). We show that the optically faint population, on the other hand, can be explained as being predominantly moderate-luminosity Type 2 AGN at higher redshifts (z ~ 2--3).