Faint galaxies - Bounds on the epoch of galaxy formation and the cosmological deceleration parameter
- Mount Stromlo and Siding Spring Observatories, Canberra (Australia) National Astronomical Observatory, Tokyo (Japan)
Models of galaxy luminosity evolution are used to interpret the observed color distributions, redshift distributions, and number counts of faint galaxies. It is found from the color distributions that the redshift corresponding to the epoch of galaxy formation must be greater than three, and that the number counts of faint galaxies, which are sensitive to the slope of the faint end of the luminosity function, are incompatible with q0 = 1/2 and indicate a smaller value. The models assume that the sequence of galaxy types is due to different star-formation rates, that the period of galaxy formation can be characterized by a single epoch, and that after formation, galaxies change in luminosity by star formation and stellar evolution, maintaining a constant comoving space density. 40 refs.
- OSTI ID:
- 5392612
- Journal Information:
- Astrophysical Journal; (United States), Vol. 372; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
GALACTIC EVOLUTION
COSMOLOGICAL MODELS
COLOR
COSMOLOGY
ENERGY SPECTRA
LUMINOSITY
PHOTOMETRY
RED SHIFT
STAR EVOLUTION
MATHEMATICAL MODELS
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHYSICAL PROPERTIES
SPECTRA
640105* - Astrophysics & Cosmology- Galaxies
640106 - Astrophysics & Cosmology- Cosmology