AAS 206th Meeting, 29 May - 2 June 2005
Session 21 Galaxies and Cosmology
Oral, Monday, 2:00-3:30pm, May 30, 2005, 102 E

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[21.07] EXO's Near and Far: Constraining AGN Numbers at the Highest Redshifts

A. M. Koekemoer (STScI), GOODS Team

The intriguing population of optically invisible X-ray sources (EXO's) detected in recent years offers the best opportunity to directly constrain the number counts of moderate-luminosity active galactic nuclei (AGN) at redshifts 6-7 and above. Some of these sources can also be described by old, evolved galaxies at redshifts 3-5, which is equally interesting since such galaxies would have had to begin forming very early in the history of the universe. I will present the latest results from the GOODS Spitzer survey program, as well as X-ray, optical and near-IR observations, to help disentangle the redshift/reddening degeneracy and use the results to constrain the growth and number density of supermassive black holes at high redshift.

If you would like more information about this abstract, please follow the link to http://www.stsci.edu/~koekemoe/aas206-goods/. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

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Bulletin of the American Astronomical Society, 37 #2
© 2005. The American Astronomical Soceity.