Infrared Views of a Complete Sample of Active Galactic Nuclei

Details Infrared Views of a Complete Sample of Active Galactic Nuclei Infrared Views of a Complete Sample of Active Galactic Nuclei

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21535305d&link_type=abstract

American Astronomical Society, AAS Meeting #215, #353.05; Bulletin of the American Astronomical Society, Vol. 42, p.536

Astronomy and Astrophysics

Astronomy

Scientific paper

Our census of supermassive black hole growth is biased against obscured sources. Commonly used AGN luminosity indicators, such as X-ray and [O III] emission, are often attenuated by several orders of magnitude, and it is difficult to accurately estimate extinction corrections. We use Spitzer observations of a complete sample of 90 local Seyferts to show that the distributions of [O IV] 26 micron luminosities, which probe high-ionization gas and suffer little dust attenuation, are indistinguishable for obscured and unobscured AGNs, indicating that their intrinsic luminosities are quite similar. Furthermore, we characterize the star formation in circumnuclear environments using the largely obscuration-independent mid-infrared aromatic features between 6 and 17 microns. We compare the interband strengths of these features to those in star-forming galaxies and test whether the AGN radiation field affects the ionization, temperature, or grain-size distribution of the aromatic dust grains. We use this information to refine aromatic-based estimates of the star-formation rate in AGN host galaxies, both locally and at high redshift.

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