Does the Number Density of Elliptical Galaxies Change at z<1?

Details Does the Number Density of Elliptical Galaxies Change at z<1? Does the Number Density of Elliptical Galaxies Change at z<1?

1998-05-20

arxiv.org/abs/astro-ph/9805262v1

Astronomy and Astrophysics

Astrophysics

11 pages including 3 figures, to appear in ApJ Letters

Scientific paper

10.1086/311461

We have performed a detailed V/Vmax test for a sample of the Canada-France Redshift Survey (CFRS) for the purpose of examining whether the comoving number density of field galaxies changes significantly at redshifts of z<1. Taking into account the luminosity evolution of galaxies which depends on their morphological type through different history of star formation, we obtain \sim 0.5 in the range of 0.30.8 due to the selection bias, thereby causing a fictitious decrease of . We therefore conclude that a reasonable choice of upper bound of redshift z \sim 0.8 in the V/Vmax test saves the picture of passive evolution for field ellipticals in the CFRS sample, which was rejected by Kauffman, Charlot, & White (1996) without confining the redshift range. However, about 10% of the CFRS sample consists of galaxies having colors much bluer than predicted for irregular galaxies, and their \avmax is significantly larger than 0.5. We discuss this population of extremely blue galaxies in terms of starburst that has just turned on at their observed redshifts.

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