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Results from ISOCAM Deep Surveys: An Answer on the AGN Contribution to the Cosmic Infrared Background

Published online by Cambridge University Press:  12 April 2016

Hervé Aussel
Hervé Aussel*
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, Hawaii, 96822, USA

Abstract

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The amount of energy contributed by type-2 AGNs to the Cosmic Infrared Background (CIB) has recently been the subject of some debate, since models have shown it could be responsible for up to half. If this were the case, this contribution should be taken carefully into account before using the combined CIB and COB to derive the density of metals in the universe. I argue here that an observational answer to this problem comes from ISOCAM deep surveys performed at 15 μm, that do resolve into discrete sources the bulk of the CIB at 140 μm. Studies of the X-ray properties of these sources allow us to assess whether or not they are dominated by AGNs, and to derive that the type-2 AGNs contribution to the CIB is not greater than 20%.

Type
Part 2. Infrared and Submillimeter Surveys for AGN
Information
International Astronomical Union Colloquium , Volume 184: AGN Surveys , 2002 , pp. 179 - 188
Copyright
Copyright © Astronomical Society of the Pacific 2002

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