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Published 2006 | Published
Book Section - Chapter Open

Mid-infrared selection of dusty AGN

Abstract

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, narrowline 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.

Additional Information

© 2006 Astronomical Society of the Pacific. We thank Alejo Martinez-Sansigre and Steve Rawlings for their contributions to the spectroscopic observations.

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Published - Lacy2006p8884Spitzer_Space_Telescope_New_Views_Of_The_Cosmos.pdf

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Created:
August 19, 2023
Modified:
January 13, 2024