Pure Luminosity Evolution Models of Faint Field Galaxy Samples; Pozzetti L. et al 1996

Miércoles, 06 de Marzo de 1996 19:30

Authors:		Pozzetti, L.; Bruzual A., G.; Zamorani, G.
Affiliation:		AA(Dipartimento di Astronomia, Universita di Bologna, via Zamboni 33, I-40126 Bologna, Italy ), AB(Centro de Investigaciones de Astronomia, AP 264, Merida 5101-A, Venezuela ), AC(Osservatorio Astronomico di Bologna, via Zamboni 33, I-40126 Bologna, Italy )
Publication:		Monthly Notices of the Royal Astronomical Society, Volume 281, Issue 3, pp. 953-969. (MNRAS Homepage)
Publication Date:		08/1996
Origin:		MNRAS
MNRAS Keywords:		GALAXIES: DISTANCES AND REDSHIFTS, GALAXIES: EVOLUTION, GALAXIES: PHOTOMETRY, COSMOLOGY: MISCELLANEOUS
Abstract Copyright:		(c) 1996 The Royal Astronomical Society
Bibliographic Code:		1996MNRAS.281..953P

Abstract

We have examined a set of pure luminosity evolution (PLE) models in order to explore up to what extent the rapidly increasing observational constraints from faint galaxy samples can be understood in this simple framework. We find that a PLE model, in which galaxies evolve mildly in time even in the rest-frame UV, can reproduce most of the observed properties of faint galaxies assuming an open (Omega~0) universe. In particular, such a model is able to fit reasonably well the number counts in the U, b_j, r_f, I and K bands, as well as the colour and redshift distributions derived from most of the existing samples. The most significant discrepancy between the predictions of this model and the data is the z distribution of faint K-selected galaxies. Significantly worse fits are obtained with PLE models for the theoretically attractive value of Omega=1, although a simple number luminosity evolution model with a significant number of merger fits the data also in this cosmology.

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