Mid-infrared selection of dusty AGN

Details Mid-infrared selection of dusty AGN Mid-infrared selection of dusty AGN

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..357..255l&link_type=abstract

The Spitzer Space Telescope: New Views of the Cosmos ASP Conference Series, Volume 357, proceedings of the conference held 9-12

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We present results from the spectroscopic follow-up of a sample of candidate obscured AGN selected in the mid-infrared from the Spitzer First Look Survey. Our selection allows a direct comparison of the numbers of obscured and unobscured AGN at a given luminosity for the first time, and shows that the ratio of obscured to unobscured AGN in an 8μm-selected sample with infrared luminosities corresponding to low luminosity quasars is ≈ 1:1 at z˜ 0.5. Most of our optically-faint candidate obscured AGN have the high-ionization, narrow-line spectra expected from type-2 AGN. We discuss techniques for selecting such samples at longer infrared wavelengths to reduce the selection bias against highly-obscured and high redshift objects inherent in our IRAC-based selection technique.

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