Constraints on the evolution of high-redshift galaxies and on q(0) from faint galaxy counts

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Faint Objects, Galactic Evolution, Red Shift, Astronomical Photography, Astronomical Spectroscopy, Color, Galactic Structure, Star Formation

Scientific paper

The intrinsic evolution of the overall population of galaxies in the remote past were analyzed using the magnitude and color distributions resulting from faint galaxy counts and a model of spectrophotometric evolution. The luminosity and spectral evolution predicted by the model for the case of 'pure' luminosity evolution were compared with apparent magnitude and color distributions obtained from faint galaxy counts in four photometric bands from 3600 to 7900 A. It is shown that, under the assumption of pure luminosity evolution, the magnitude and color distributions are consistent only with scenarios of evolution in which a significant fraction of the galaxies formed at high redshift (the value of the redshift of galaxy formation, z/for/, equal to about 10 or more), in a universe with a low value of the deceleration parameter q(0). Good fit was obtained with q(0) = 0.05 and z(for) = 30.

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