Mid-infrared sources in the ELAIS Deep X-ray Survey
Abstract
We present a cross-correlation of the European Large Area ISO survey (ELAIS) with the ELAIS Deep X-ray Survey of the N1 and N2 fields. There are 7 Chandra point sources with matches in the ELAIS Final Analysis 15um catalogue, out of a total of 28 extragalactic ISO sources present in the Chandra fields. Five of these are consistent with AGN giving an AGN fraction of ~19 per cent in the 15um 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.
Cite
@article{arxiv.astro-ph/0409723,
title = {Mid-infrared sources in the ELAIS Deep X-ray Survey},
author = {J. C. Manners and S. Serjeant and S. Bottinelli and M. Vaccari and A. Franceschini and I. Perez-Fournon and E. Gonzalez-Solares and C. J. Willott and O. Johnson and O. Almaini and M. Rowan-Robinson and S. Oliver},
journal= {arXiv preprint arXiv:astro-ph/0409723},
year = {2009}
}
Comments
9 pages, 6 figures, MNRAS accepted