Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.1333l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 4, p. 1333-1343.
Astronomy and Astrophysics
Astronomy
25
Faint Objects, Far Infrared Radiation, Galactic Evolution, Luminosity, Space Density, Blue Stars, Red Shift, Sky Surveys (Astronomy), Stellar Magnitude
Scientific paper
The space density of blue-selected galaxies at moderate redshifts is determined here directly by deriving the luminosity function. Evidence is found for density evolution for moderate luminosity galaxies at a rate of (1+z) exp delta, with a best fit of delta + 4 +/- 2, between the current epoch and Z greater than about 0.1. At M(b) less than -22 evidence is found for about 0.5-1.5 mag of luminosity evolution in addition to the density evolution, corresponding to an evolutionary rate of about (1+z) exp gamma, with gamma = 0.5-2.5, but a redshift of about 0.4. Assuming a steeper faint end slope of alpha = -1.3 similar to that observed in the Virgo cluster, could explain the data with a luminosity evolution rate of gamma = 1-2, without need for any density evolution. Acceptable fits are found by comparing composite density and luminosity evolution models to faint IRAS 60 micron source counts, implying that the blue and far-IR evolutionary rates may be similar.
Chokshi Arati
Lonsdale Carol J.
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