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arXiv · astro-ph/0310742

The manifold spectra and morphologies of EROs

A. Cimatti·E. Daddi·P. Cassata·E. Pignatelli·G. Fasano·J. Vernet·E. Fomalont·K. Kellermann·G. Zamorani·M. Mignoli·L. Pozzetti·A. Renzini·S. di Serego Alighieri·A. Franceschini·E. Giallongo·A. Fontana
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Abstract

Deep VLT optical spectroscopy, HST+ACS (GOODS) imaging and VLA observations are used to unveil the nature of a complete sample of 47 EROs with R-Ks>5 and Ks<20. The spectroscopic redshift completeness is 62%. Morphological classification was derived for each ERO through visual inspection and surface brightness profile fitting. Three main ERO morphological types are found: E/S0 galaxies (30-37%), spiral-like (24-46%) and irregular systems (17-39%). The only ERO detected in the radio is likely to host an obscured AGN. The average radio luminosity of the star-forming EROs undetected in the radio implies star formation rates of the order of 33 Msun yr^-1. The colors, redshifts and masses of the E/S0 galaxy subsample imply a minimum formation redshift z_f \sim 2. With this z_f there is enough time to have old and massive stellar spheroids already assembled at z \sim 1. We verify that the R-Ks vs. J-Ks color diagram is efficient in segregating old and dusty-star-forming EROs.

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A. Cimatti, E. Daddi, P. Cassata, E. Pignatelli, G. Fasano, J. Vernet, E. Fomalont, K. Kellermann, G. Zamorani, M. Mignoli, L. Pozzetti, A. Renzini, S. di Serego Alighieri, A. Franceschini, E. Giallongo, A. Fontana. 2003-10-27. The manifold spectra and morphologies of EROs. https://doi.org/10.1051/0004-6361%3A20031601

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