Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372....8y&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 372, May 1, 1991, p. 8-20. Research supported by Australian Academy of Scie
Astronomy and Astrophysics
Astrophysics
34
Cosmology, Faint Objects, Galactic Evolution, Red Shift, Astronomical Models, Astronomical Photometry, Luminosity, Spectral Energy Distribution
Scientific paper
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.
Peterson Bruce A.
Yoshii Yuzuru
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