The ELAIS deep X-ray survey

Willott, C.J.; Almaini, O.; Manners, J.; Johnson, O.; Lawrence, A.; Dunlop, J.S.; Mann, R.G.; Perez-Fournon, I.; Gonzalez-Solares, E.; Cabrera-Guerra, F.; Serjeant, S.; Oliver, S.J. and Rowan-Robinson, M. (2001). The ELAIS deep X-ray survey. In: Astrophysics Meeting, 10-17 Mar 2001, Savoie, France.



We present initial follow-up results of the ELAIS Deep X-ray Survey which is being undertaken with the Chandra and XMM-Newton Observatories. 235 X-ray sources are detected in our two 75 ks ACIS-I observations in the well-studied ELAIS N1 and N2 areas. 90% of the X-ray sources are identified optically to R=26 with a median magnitude of R=24. We show that objects which are unresolved optically (i.e. quasars) follow a correlation between their optical and X-ray fluxes, whereas galaxies do not. We also find that the quasars with fainter optical counterparts have harder X-ray spectra, consistent with absorption at both wavebands. Initial spectroscopic follow-up has revealed a large fraction of high-luminosity Type 2 quasars. The prospects for studying the evolution of the host galaxies of X-ray selected Type 2 AGN are considered.

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