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E. Treister, E.T. Chatzichristou, C.M. Urry (Yale U.), A.M. Koekemoer (STScI), D.M. Alexander, F.E. Bauer (Penn State U.), C.J. Conselice (Caltech), P. Padovani (STScI)
The ratio of obscured to unobscured AGN, and the evolution of that ratio with redshift, is important for understanding (1) the AGN phenomenon and (2) the production of the extragalactic X-ray and infrared ``backgrounds.'' Current models for these backgrounds predict a different evolution for obscured AGN compared to unobscured (type 1) AGN. Deep X-ray/infrared surveys like GOODS (the Great Observatories Origins Deep Survey, a deep multi-wavelength survey using SIRTF, HST/ACS, Chandra, XMM, and an array of ground-based telescopes) test these models at virtually all redshifts.
We present the expected number of obscured and unobscured sources in several wavebands, ranging from the SIRTF 24-micron MIPS band to optical HST/ACS bands to Chandra X-ray bands, based on various plausible assumptions about their luminosity functions and evolution. These semi-theoretical predictions are compared with the observed number counts obtained from the GOODS data.
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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.