Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-04-02
Ann.Rev.Astron.Astrophys. 35 (1997) 389-443
Astronomy and Astrophysics
Astrophysics
42 pages with 10 embedded figures available in gzipped postscript from ftp://ftp.ast.cam.ac.uk/pub/rse/annrev97.ps.gz To appea
Scientific paper
10.1146/annurev.astro.35.1.389
The physical properties of the faint blue galaxy population are reviewed in the context of observational progress made via deep spectroscopic surveys and Hubble Space Telescope imaging of field galaxies at various limits, and theoretical models for the integrated star formation history of the Universe. Notwithstanding uncertainties in the properties of the local population of galaxies, convincing evidence has emerged from several independent studies for a rapid decline in the volume-averaged star formation rate of field galaxies since a redshift z~1. Together with the small angular sizes and modest mean redshift of the faintest detectable sources, these results can be understood in hierarchical models where the bulk of the star formation occurred at redshifts between z~1-2. The physical processes responsible for the subsequent demise of the faint blue galaxy population remains unclear. Considerable progress will be possible when the evolutionary trends can be monitored in the context of independent physical parameters such as the underlying galactic mass.
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