AEGIS: Host galaxy morphologies of X-ray-selected and infrared-selected active galactic nuclei at 0.2 ≤ z < 1.2

C. M. Pierce, J. M. Lotz, E. S. Laird, L. Lin, K. Nandra, J. R. Primack, S. M. Faber, P. Barmby, S. Q. Park, S. P. Willner, S. Gwyn, D. C. Koo, A. L. Coil, M. C. Cooper, A. Georgakakis, A. M. Koekemoer, K. G. Noeske, B. J. Weiner, C. N.A. Willmer

Research output: Contribution to journalArticlepeer-review

94 Scopus citations

Abstract

We visually and quantitatively determine the host galaxy morphologies of 94 intermediate-redshift (0.2 ≤ z < 1.2) active galactic nuclei (AGNs), selected using Chandra X-ray data and Spitzer mid-infrared data in the Extended Groth Strip. Using recently developed morphology measures, the second-order moment of the brightest 20% of a galaxy's flux (M20) and the Gini coefficient, we find that X-ray-selected AGNs mostly reside in E/S0/Sa galaxies (53-10+11%), while IR-selected AGNs show no clear preference for host morphology. X-ray-selected AGN hosts are members of close pairs more often than the field population by a factor of 3.3 ± 1.4, but most of these pair members appear to be undisturbed early-type galaxies and do not tend to show direct evidence of gravitational perturbations or interactions. Thus, the activation mechanism for AGN activity remains unknown, even for pair members.

Original languageEnglish (US)
Pages (from-to)L19-L22
JournalAstrophysical Journal
Volume660
Issue number1 II
DOIs
StatePublished - May 1 2007

Keywords

  • Galaxies: active
  • Galaxies: interactions
  • Galaxies: nuclei
  • Infrared: galaxies
  • X-rays: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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