Astronomy and Astrophysics – Astronomy
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...206.2107k&link_type=abstract
American Astronomical Society Meeting 206, #21.07; Bulletin of the American Astronomical Society, Vol. 37, p.462
Astronomy and Astrophysics
Astronomy
Scientific paper
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.
GOODS Team
Koekemoer Anton M.
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