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Proceedings Paper

The K20 survey: new light on the evolution of massive galaxies from deep VLT spectroscopic observations
Author(s): Emanuele Daddi; Andrea Cimatti; Lucia Pozzetti
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Paper Abstract

Were massive galaxies already in place at high redshift or were they assembled to their total stellar mass only in recent epochs? Trying to quantitatively answer this question is the main goal of the K20 spectroscopic survey that we carried out at the VLT, measuring the redshift of about 500 Ks-selected galaxies. In this paper, we present the first results of this survey and discuss the first constraints on the nature, number density and clustering of EROs, the derivation of the redshift distribution of Ks<20 galaxies and the first results on the evolution of the Ks-band luminosity function. This wealth of observational results is compared to theorethical predictions of semianalytical hierarchical models. The results indicate that, up to z~1-1.5, luminosity evolution provides a satisfactory picture, whereas the strong density evolution required by the current scenarios of hierarchical merging is inconsistent with the observations. The origin of the discrepancy may reside in the incorrect treatment of the baryon assembly, the star formation modes and epoch, and the role of feedback.

Paper Details

Date Published: 13 February 2003
PDF: 12 pages
Proc. SPIE 4834, Discoveries and Research Prospects from 6- to 10-Meter-Class Telescopes II, (13 February 2003); doi: 10.1117/12.456510
Show Author Affiliations
Emanuele Daddi, European Southern Observatory (Germany)
Andrea Cimatti, Osservatorio Astrofisico di Arcetri (United States)
Lucia Pozzetti, Osservatorio Astrofisico di Arcetri (Italy)

Published in SPIE Proceedings Vol. 4834:
Discoveries and Research Prospects from 6- to 10-Meter-Class Telescopes II
Puragra Guhathakurta, Editor(s)

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