Mathematics – Logic
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21831701k&link_type=abstract
American Astronomical Society, AAS Meeting #218, #317.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
Using high-resolution HST/WFC3 imaging in the J and H bands, we have examined the rest-frame optical morphologies and colors of X-ray selected AGN hosts at z 2 for the first time. This imaging was taken as part of the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS), which aims to document the evolution of galaxies and black holes at z > 1.5. I will show that from visual classifications we have determined that AGN hosts do not exhibit merger or interaction signatures more often than non-active galaxies of similar mass at this redshift. We have also used Galfit to determine the morphological breakup of these galaxies and find that a high fraction of the AGN are located in disk-like systems. Our results suggest that the bulk of the X-ray luminous AGN population at z 2 could not have been triggered by a major merger event in the recent past. I will compare the observed properties of the AGN hosts to what is predicted from semi-analytic cosmological models which incorporate a prescription for merger-triggered, self-regulated black hole growth and discuss the implications for AGN feedback models.
CANDELS Collaboration
Faber Sandra M.
Grogin Norman Andrew
Kocevski Dale D.
Koekemoer Anton M.
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