Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-14
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures. Proceedings for the "X-ray Surveys: in the light of new observatories" workshop. To be published in Astron
Scientific paper
Extremely Red Objects (EROs, R-K>5) constitute a heterogenous class of extragalactic sources including high redshift elliptical galaxies, dusty star-forming systems and heavily obscured AGNs. Hard X-ray observations provide an unique and powerful tool to uncover obscured nuclear or star-forming activity. We present the results of XMM-Newton observations of the largest sample of EROs available to date (about 450 objects over a contiguous area of 700 arcmin^2). Five of the 46 hard X-ray selected sources brighter than 3x10^{-15} cgs in the 2-10 keV band, are associated with EROs. All of the X-ray detected EROs show rather extreme X-ray-to-optical flux ratios, suggesting the presence of highly obscured AGN activity. We also report on the X-ray stacking analysis of spectroscopically identified EROs in the Chandra Deep Field South.
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