An XMM-Newton survey of Extremely Red Objects
M. Brusa, A. Comastri, E. Daddi, A. Cimatti, C. Vignali
Abstract
We present preliminary results of a 25 ks XMM-Newton observation of the largest sample of Extremely Red Objects (EROs) available to date (about 450 sources), selected in a contiguous area of 700 arcmin2 (Daddi et al. 2000). Five of the 36 hard X-ray selected sources brighter than 7x10-15 erg cm-2 s-1 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.
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