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AGN torus properties with WISE

Published online by Cambridge University Press:  25 July 2014

Robert Nikutta ,
Maia Nenkova ,
Željko Ivezić ,
Nicholas Hunt-Walker  and
Moshe Elitzur
Robert Nikutta
Affiliation:
Departamento de Ciencias Físicas, Universidad Andrés Bello, Av. República 252, Santiago, Chile email: [email protected] Department of Physics & Astronomy, University of Kentucky, Lexington, KY 40506, USA email: [email protected]
Maia Nenkova
Affiliation:
School of English and Liberal Studies, Seneca College, Toronto, ON, M2J 2X5, Canada email: [email protected]
Željko Ivezić
Affiliation:
Astronomy Department, University of Washington, Box 351580, Seattle, WA 98195-1580, USA email: [email protected], [email protected]
Nicholas Hunt-Walker
Affiliation:
Astronomy Department, University of Washington, Box 351580, Seattle, WA 98195-1580, USA email: [email protected], [email protected]
Moshe Elitzur
Affiliation:
Department of Physics & Astronomy, University of Kentucky, Lexington, KY 40506, USA email: [email protected]
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Abstract

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The Wide-field Infrared Survey Explorer (WISE) has scanned the entire sky with unprecedented sensitivity in four infrared bands, at 3.4, 4.6, 12, and 22 μm. The WISE Point Source Catalog contains more than 560 million objects, among them hundreds of thousands of galaxies with Active Nuclei (AGN). While type 1 AGN, owing to their bright and unobscured nature, are easy to detect and constitute a rather complete and unbiased sample, their type 2 counterparts, postulated by AGN unification, are not as straightforward to identify. Matching the WISE catalog with known QSOs in the Sloan Digital Sky Survey we confirm previous identification of the type 1 locus in the WISE color space. Using a very large database of the popular Clumpy torus models, we find the colors of the putative type 2 counterparts, and also, for the first time, predict their number vs. flux relation that can be expected to be observed in any given WISE color range. This will allow us to put statistically very significant constraints on the torus parameters. Our results are a successful test of the AGN unification scheme.

Keywords

radiative transfergalaxies: activegalaxies: Seyfertinfrared: galaxiescatalogsmethods: data analysismethods: statistical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S304: Multiwavelength AGN Surveys and Studies , October 2013 , pp. 56 - 60
Copyright
Copyright © International Astronomical Union 2014 

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