Poster Title: Are QSO2 hiding among EROS?
Abstract: I present the results of a deep (about 80 ks) XMM-Newton survey of the largest sample of near-infrared selected Extremely Red Objects (R-K > 5) available to date (Daddi et al. 2000). At the relatively bright X-ray and near-infrared fluxes probed by the present observations, AGN account only for a negligible fraction (3%) of the ERO population; conversely, the fraction of EROs among X-ray selected samples is much higher (15-20%). The X-ray properties of EROs individually detected in the XMM-Newton observation indicate absorption in excess of 10^22 cm^-2. To place our findings in a broader context, we have also considered all the sources in the CDF-N sample (Barger et al. 2003) with ERO colors. Spectral analysis of the highest S/N sources unambiguously indicate that large column of cold gas (even > 10^23 cm^-2) are the rule rather than the exception. Although a spectroscopic redshift is not available for all of the sources, the X-ray, optical, and near-infrared properties of X-ray selected EROs nicely fit those expected for Quasars 2, the high-luminosity, high-redshift obscured AGNs predicted in XRB synthesis models.
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