AAS 204th Meeting, June 2004
Session 91 Young Galaxies and Evolution in the Early Universe
Oral, Thursday, June 3, 2004, 2:00-3:30pm, 603/605/607

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[91.06] Spitzer Imaging of Extreme X-ray / Optical sources (EXOs): Black Holes in the Early Universe

A. M. Koekemoer (STScI), GOODS Team

The first Spitzer images from the GOODS survey have revealed detections of all the Extreme X-ray / Optical sources ("EXO"s) in the CDF-South. These X-ray sources are completely undetected in our deep optical GOODS HST/ACS imaging, to limits that place them at the extreme end of the Fx/Fopt parameter space, with values about 100 to 1000 times higher than generally found for Active Galactic Nuclei (AGN). We use their Spitzer detections to investigate two possible scenarios for their nature: (1) their hosts could be extremely faint, obscured high-redshift Extremely Red Objects (EROs), at redshifts about 3 - 5, thus higher redshift than other samples of EROs; (2) some of them could lie at redshifts above about 6 - 7, such that their Lyman-alpha emission is completely redshifted into the IR. In either case, these objects serve as a valuable probe of black hole growth and accretion activity in the early universe.

If you would like more information about this abstract, please follow the link to http://www.stsci.edu/~koekemoe/. 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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