On the nature of Extremely Red Objects: the 2 Ms Chandra Deep Field-North Survey results

C. Vignali , D.M. Alexander , F.E. Bauer , W.N. Brandt , A.E. Hornschemeier , G.P. Garmire , D.P. Schneider

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classification 🌌 astro-ph

keywords x-rayemissionchandradeepdetectederosextremelyfield-north

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Understanding the nature of Extremely Red Objects [EROs; (I-K)>=4] is one of the most challenging issues in observational cosmology. Here we report on the X-ray constraints provided by the 2 Ms Chandra Deep Field-North Survey (CDF-N). X-ray emission has been detected from 11 out of 36 EROs (approx 30%). Five of these have hard X-ray emission and appear to be obscured AGNs, while non-AGN emission (star formation or normal elliptical galaxy emission) is likely to be the dominant source of X-rays from the soft X-ray sources detected at the faintest X-ray flux levels.

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On the nature of Extremely Red Objects: the 2 Ms Chandra Deep Field-North Survey results

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