Mid-infrared sources in the ELAIS Deep X-ray Survey

Manners, J C, Serjeant, S, Bottinelli, S, Vaccari, M, Franceschini, A, Perez-Fournon, I, Gonzalez-Solares, E, Willott, C J, Johnson, O, Almaini, O, Rowan-Robinson, M and Oliver, Seb (2004) Mid-infrared sources in the ELAIS Deep X-ray Survey. Monthly Notices of the Royal Astronomical Society, 355 (1). pp. 97-105. ISSN 0035-8711

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We present a cross‐correlation of the European Large Area Infrared Space Observatory (ISO) survey (ELAIS) with the ELAIS Deep X‐ray Survey of the N1 and N2 fields. There are seven Chandra point sources with matches in the ELAIS Final Analysis 15‐μm catalogue, out of a total of 28 extragalactic ISO sources present in the Chandra fields. Five of these are consistent with active galactic nuclei (AGN) giving an AGN fraction of ∼19 per cent in the 15‐μm flux range 0.8–6 mJy. We have co‐added the hard X‐ray fluxes of the individually undetected ISO sources and find a low significance detection consistent with star formation in the remaining population. We combine our point source cross‐correlation fraction with the XMM–Newton observations of the Lockman Hole and Chandra observations of the Hubble Deep Field North to constrain source count models of the mid‐infrared galaxy population. The low dust‐enshrouded AGN fraction in ELAIS implied by the number of cross‐identifications between the ELAIS mid‐infrared sample and the Chandra point sources is encouraging for the use of mid‐infrared surveys to constrain the cosmic star formation history, provided there are not further large undetected populations of Compton‐thick AGN.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: EPrints Services
Date Deposited: 06 Feb 2012 20:03
Last Modified: 30 Jul 2019 07:44
URI: http://sro.sussex.ac.uk/id/eprint/23824

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