Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21332307k&link_type=abstract
American Astronomical Society, AAS Meeting #213, #323.07; Bulletin of the American Astronomical Society, Vol. 41, p.379
Other
Scientific paper
Recent galaxy evolution models suggest that feedback from Active Galactic Nuclei (AGN) may be responsible for suppressing star formation in their host galaxies and the subsequent migration of these systems onto the red sequence. To investigate the role of AGN in driving the evolution of their hosts, we have carried out a multiwavelength study of the environments and optical properties of galaxies harboring x-ray, radio and mid-infrared selected AGN found in the Cl1604 supercluster at z=0.9. Making use of HST / ACS, Chandra / ACIS-I, Spitzer / MIPS and IRAC, VLA / 20-cm, and Keck / DEIMOS observations we examine the integrated colors, morphologies, environments and spectral properties of galaxies hosting AGN with a wide range of luminosities. We find that moderate-luminosity (Lx 10^43 erg s^-1) type 2 Seyferts detected in our x-ray imaging have colors that place them in the valley between the blue cloud and red sequence in color-magnitude space, consistent with predictions that the hosts of such AGN should constitute a transition population. We also find that a substantial number exhibit post-starburst spectral features, indicating they experienced an enhanced level of star formation within the last 1 Gyr which was rapidly suppressed. Their host galaxies also tend to avoid the densest regions of the supercluster and show signs of recent interactions. On the other hand, the host galaxies of less luminous radio detected AGN in the Cl1604 system have colors consistent with the supercluster red sequence and are predominately found in denser environments; a majority are found within 0.5 Mpc of a cluster center. Overall we find that the properties of the host galaxies are generally consistent with AGN feedback scenarios, suggesting this mechanism may play an important role in accelerating galaxy evolution in large-scale structures.
Fassnacht Chris D.
Gal Roy R.
Kocevski Dale D.
Lacy Mark
Lemaux Brian C.
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