Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21712803j&link_type=abstract
American Astronomical Society, AAS Meeting #217, #128.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
I will present a new excitation diagnotic that allows us to identify the presence of active galactic nuclei (AGNs) in galaxies out to redshift 1. Our understanding of galaxy evolution relies on disentangling the roles of star formation and AGN, two phenomena affecting the fate of galaxies. Although it has become increasingly clear that supermassive black holes (SMBHs) are ubiquitous, the details of their connection to their host galaxies remain open questions. For instance, what fraction of SMBHs are actively accreting? How does that fraction relate to the rate of star formation? To address these topics, I will describe a census of AGNs within 70-micron selected galaxies from the Far-Infrared Deep Extragalactic Legacy survey (FIDEL). This population of galaxies includes the main contributors to the star formation rate density at redshift 1. We find that although only 10-12% of 70-micron galaxies with emission lines host a strong, X-ray detected AGN, the AGN fraction reaches 40% when including systems with low-level activity. Furthermore, the diagram reveals AGNs that are misidentified in the most sensitive Chandra X-ray observations (reaching 2 Msec in the GOODS-North field). I will show evidence that a large number of these "missed" AGNs are likely Compton-thick.
Dickinson Marc
Juneau Stephanie
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