EXO'S: A population of dusty, high-redshift agn

Anton M. Koekemoer, D. M. Alexander, F. E. Bauer, J. Bergeron, W. N. Brandt, S. Cristiani, M. Dickinson, N. A. Grogin, V. Mainieri, L. Moustakas, C. M. Urry

Research output: Contribution to journalConference articlepeer-review


A significant population of obscured black holes at high redshift has recently been revealed by Spitzer detections of Extreme X-ray / Optical sources ('EXO's). These AGN are detected in deep Chandra and XMM surveys but are completely undetected in deep optical imaging, and are thus at the extreme end of the Fx/Fopt plane with values about 100 times above typical AGN. Their Spitzer detections indicate high reddening of their hosts due to substantial amounts of dust that obscure the AGN as well as most of the stellar population, suggesting intense on-going starformation that may also be linked to increased accretion onto the central black hole. These objects therefore provide a unique opportunity to probe the relationship between galaxy evolution and black hole growth in the early universe.

Original languageEnglish (US)
Pages (from-to)111-114
Number of pages4
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number577
StatePublished - Aug 29 2005
EventThe Dusty and Molecular Universe - A Prelude to Herschel and ALMA - Paris, France
Duration: Oct 27 2004Oct 29 2004

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Space and Planetary Science


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