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An XMM-Newton survey of Extremely Red Objects

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arxiv astro-ph/0204251 v1 submitted 2002-04-15 astro-ph

M. Brusa (Dipartimento di Astronomia , Bologna , Italy) , A. Comastri (INAF-Osservatorio Astronomico di Bologna , E. Daddi (European Southern Observatory , Garching , Germany) , A. Cimatti (INAF-Osservatorio Astrofisico di Arcetri
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Firenze C. Vignali (The Pennsylvania State University University Park USA)
This is my paper · ORCID
classification astro-ph
keywords erosextremelyobjectsselectedsourcesx-rayxmm-newtonactivity
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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 arcmin^2 (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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