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Title:
AEGIS: New Evidence Linking Active Galactic Nuclei to the Quenching of Star Formation
Authors:
Bundy, Kevin; Georgakakis, Antonis; Nandra, Kirpal; Ellis, Richard S.; Conselice, Christopher J.; Laird, Elise; Coil, Alison; Cooper, Michael C.; Faber, Sandra M.; Newman, Jeff A.; Pierce, Christy M.; Primack, Joel R.; Yan, Renbin
Affiliation:
AA(Reinhardt Fellow, Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Room 101, Toronto, ON M5S 3H4, Canada.), AB(Astrophysics Group, Blackett Laboratory, Imperial College, London SW7 2AZ, UK.; Marie Curie Fellow.), AC(Astrophysics Group, Blackett Laboratory, Imperial College, London SW7 2AZ, UK.), AD(California Institute of Technology, 1201 East California Boulevard, MS 105-24, Pasadena, CA 91125.), AE(California Institute of Technology, 1201 East California Boulevard, MS 105-24, Pasadena, CA 91125.; School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK.), AF(Astrophysics Group, Blackett Laboratory, Imperial College, London SW7 2AZ, UK.), AG(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.; Hubble Fellow.), AH(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.; Spitzer Fellow.), AI(University of California Observatories/Lick Observatory, University of California, Santa Cruz, CA 95064.), AJ(Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260.), AK(Department of Physics, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064.), AL(University of California Observatories/Lick Observatory, University of California, Santa Cruz, CA 95064.), AM(Department of Astronomy, University of California, Berkeley, MC 3411, Berkeley, CA 94720.)
Publication:
The Astrophysical Journal, Volume 681, Issue 2, pp. 931-943. (ApJ Homepage)
Publication Date:
07/2008
Origin:
UCP
ApJ Keywords:
Cosmology: Observations, Galaxies: Evolution, Galaxies: Formation
DOI:
10.1086/588719
Bibliographic Code:
2008ApJ...681..931B

Abstract

Using Chandra X-ray observations in the All-Wavelength Extended Groth Strip International Survey (AEGIS) we identify 241 X-ray-selected active galactic nuclei (AGNs; L2-10>1042 ergs s-1) and study the properties of their host galaxies in the range 0.4<z<1.4. By making use of infrared photometry from the Palomar Observatory and BRI imaging from the Canada-France-Hawaii Telescope, we estimate AGN host galaxy stellar masses and show that both stellar mass and photometric redshift estimates (where necessary) are robust to the possible contamination from AGNs in our X-ray-selected sample. Accounting for the photometric and X-ray sensitivity limits of the survey, we construct the stellar mass function of X-ray-selected AGN host galaxies and find that their abundance decreases by a factor of ~2 since z~1 but remains roughly flat as a function of stellar mass. We compare the abundance of AGN hosts to the rate of star formation quenching observed in the total galaxy population. If the timescale for X-ray-detectable AGN activity is roughly 0.5-1 Gyr, as suggested by black hole demographics and recent simulations, then we deduce that the inferred AGN ``trigger'' rate matches the star formation quenching rate, suggesting a link between these phenomena. However, given the large range of nuclear accretion rates we infer for the most massive and red hosts, X-ray-selected AGNs may not be directly responsible for quenching star formation.
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