Counter-Evolution of Faint Field Galaxies

Details Counter-Evolution of Faint Field Galaxies Counter-Evolution of Faint Field Galaxies

1993-07-21

arxiv.org/abs/astro-ph/9307029v1

Astrophys.J. 415 (1993) L21

Astronomy and Astrophysics

Astrophysics

10 pages + 4 figures (appended), AAS LaTeX v3.0, Ap.J. Letters in press, UCO/Lick Bulletin #1263

Scientific paper

10.1086/187023

We adopt a new approach to explore the puzzling nature of faint blue field galaxies. Instead of assuming that the local luminosity function is well defined, we first determine whether any non-evolving set of luminosity functions for different spectral types of galaxies is compatible with the observed marginal distributions in optical and near-infrared counts, B - R colors, and redshifts. Exploiting a non-negative least squares method, we derive a new no-evolution model that is found to fit all the observations surprisingly well. We conclude that models more exotic than mild luminosity evolution, such as those requiring rapid evolution in star formation rates, disappearing dwarf galaxy populations, high values of the cosmological constant, rapid mergers, or substantial non-conservation of galaxy numbers with time, are no longer as compelling.

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