Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21930502s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #305.02
Astronomy and Astrophysics
Astronomy
Scientific paper
Although much progress has been made in the investigation of the co-evolution of black holes and galaxies, the nature of AGN accretion triggers and AGN-host feedback remain open questions. Using a sample of X-ray selected, moderate-luminosity AGN and their host galaxies in the GOODS fields from 0.5 < z < 2.7, we assess the growth rates and histories of these black holes, and use their host galaxy morphologies and colors to test the applicability of common quasar-triggering models to lower-powered AGN. We find that moderate-luminosity AGN span a range of growth rates but are mostly in a phase of slow growth, implying that they must have been growing at higher rates in the past in order to grow to the masses we observe. Additionally, a significant fraction of the host galaxies of moderate-luminosity AGN are disk-dominated even at the highest redshifts in our sample, indicating that models requiring major mergers to trigger the growth of black holes do not describe the majority of AGN. The range of both black hole growth rates and host galaxy colors and morphologies in our sample imply that secular processes are fundamental to the growth of moderate-luminosity AGN, which collectively dominate the AGN luminosity function.
We acknowledge support from NASA through grants HST-GO-09425.13-A, HST-GO-09822.09-A, HST-AR-10689.01, and HST-AR-12638.01 from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy under NASA contract NAS 5-26555.
Simmons Brooke
Urry Claudia Megan
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