Colors, Luminosity Function and Counts of Galaxies

Details Colors, Luminosity Function and Counts of Galaxies Colors, Luminosity Function and Counts of Galaxies

1995-10-25

arxiv.org/abs/astro-ph/9510131v2

Astronomy and Astrophysics

Astrophysics

6 pages, TeX, 9 PostScript figures, to appear in MNRAS

Scientific paper

Standard models for deep galaxy counts are based on luminosity functions (LF) with relatively flat faint end ($\alpha\sim-1.0$). Galaxy counts in the B--band exceed the prediction of such models by a factor of 2 to more than 5, forcing the introduction of strong luminosity and/or density evolution. Recently Marzke et al. (1994a) using the CfA redshift survey sample find that the number of galaxies in the range $-16<2.5$ for dwarf galaxies, we reproduce well also the observed $K$--band deep galaxy counts. This assumption is supported by the strong correlation we found between $B-K$ color of galaxies and their infrared absolute magnitude: galaxies become bluer with decreasing luminosity.

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