EROs in GOODS: The nature, morphologies, and X-ray properties of Extremely Red Object galaxies in the CDF-S field

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Scientific paper

Using collated U'- through Ks-band imaging data in the GOODS-South ACS mosaic (which overlaps with the Chandra Deep Field-South), we select `extremely red object' (ERO) galaxies through optical-minus-infrared colors that are comparable to, or in excess of, those possible by aged stellar populations at redshifts z=1-2. Using simple models consistent with current data on EROs, we employ color-selection criteria to split the sample of ~140 galaxies into `old,' `dusty,' and `other' subsets. We independently quantify their concentration and asymmetry indices using the high-resolution HST/ACS Z-band data. The objects are cross-correlated with the point- and extended X-ray sources list and comparisons made between the `AGN' and `non-AGN' ERO samples, particularly in view of the morphologies. Photometric redshifts for all objects have been determined using data from up to 13 bands combining ground- and ACS-photometry. Using these measurements, we attempt to determine the (astro-)physical parameters that characterize the main types of EROs, and place them in the context of galaxy formation at redshifts z=1-2. Ground-based imaging data were taken at ESO 2.2m, NTT, VLT, and NOAO 4m telescopes and made publicly available.

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