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

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

2002-09-19

arxiv.org/abs/astro-ph/0209415v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, Latex macro sprocl.sty, to be published in the proceedings of the 5th Italian AGN Meeting "Inflows, Outflo

Scientific paper

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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