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Title:
Probing Faint Active Galaxies at Redshifts 6 7 and above
Authors:
Koekemoer, Anton M.; Bergeron, J.; Alexander, D.; Brandt, W.; Chary, R.; Conselice, C.; Cristiani, S.; Daddi, E.; Dickinson, M.; Elbaz, D.; Grogin, N.; Hasinger, G.; Mainieri, V.; Treister, E.; Urry, C. M.
Affiliation:
AA(STScI), AB(IAP, France), AC(Institute of Astronomy, United Kingdom), AD(PSU), AE(Caltech), AF(University of Nottingham, United Kingdom), AG(Osservatorio di Trieste, Italy), AH(CEA, France), AI(NOAO), AJ(CEA, France), AK(JHU), AL(MPE, Germany), AM(ESO, Germany), AN(ESO, Chile), AO(Yale University)
Publication:
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #52.08; Bulletin of the American Astronomical Society, Vol. 38, p.966
Publication Date:
12/2006
Origin:
AAS
Bibliographic Code:
2006AAS...209.5208K

Abstract

The advent of deep and wide multi-wavelength surveys provides unprecedented new opportunities to search for very high redshift active galactic nuclei by constructing samples of sources that are detected at X-ray wavelengths but completely undetected at optical wavelengths to very deep limits. I will describe recent work on constructing samples of candidate AGN at or beyond redshift 6 7, such as the `EXO's selected from deep multiband X-ray/HST/IR surveys including GOODS and similar large projects. The optical flux limits are combined with IR detections, together with X-ray fluxes, to model the spectral energy distributions of the sources and help discriminate intermediate-redshift interlopers from the rare number of likely high-redshift sources. The resulting constraints on the number of candidate AGN at or above redshift 7 are used to examine the evolution of the AGN luminosity function at high redshift, with corresponding implications for the co-evolution of galaxies and their central black holes.
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