Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411..501l&link_type=abstract
Astrophysical Journal - Part 1 (ISSN 0004-637X), vol. 411, no. 2, p. 501-512.
Astronomy and Astrophysics
Astrophysics
112
Astrometry, Astronomical Spectroscopy, Galactic Evolution, Galactic Mass, Red Shift, Spectral Bands, Cosmology, Hubble Constant, Spectral Energy Distribution
Scientific paper
Simple 'no evolution' predictions are supported by new spectroscopic observations of a statistically complete sample of 50 very faint I-band selected galaxies, despite a roughly threefold excess in the number-magnitude counts relative to a no-evolution q(0) = 0.5 model. This points to a domination of the faint field galaxy population by a rapidly evolving population of numerous, and presumably relatively low-mass galaxies. Nevertheless, a Lambda-dominated universe with q(0) of about -0.85 would require little evolution in the luminosity function at rest wavelengths of about 5500 A back to z of about 0.5
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