Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...428...43m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 428, no. 1, p. 43-50
Astronomy and Astrophysics
Astrophysics
220
Cosmology, Galactic Evolution, Galactic Rotation, Luminous Intensity, Mass Distribution, Red Shift, Astronomical Photometry, Correlation Detection, Error Analysis, Galactic Clusters, Galactic Mass
Scientific paper
We use the CfA Reshift Survey of galaxies with mz less than or equal to 15.5 to calculate the galaxy luminosity function over the range -13 less than or equal to Mz less than or equal to -22. The sample includes 9063 galaxies distributed over 2.1 sr. For galaxies with velocities cz greater or equal to 2500 km per sec, where the effects of peculiar velocities are small, the luminosity function is well represented by a Schechter function with parameters phistar = 0.04 +/- 0.01 per cu Mpc, Mstar = -18.8 +/- 0.3, and alpha = -1.0 +/- 0.2. When we include all galaxies with cz greater or equal to 500 km per sec, the number of galaxies in the range -16 less than or equal to Mz less than or equal to -13 exceeds the extrapolation of the Schechter function by a factor of 3.1 +/- 0.5. This faint-end excess is not caused by the local peculiar velocity field but may be partially explained by small scale errors in the Zwicky magnitudes. Even with a scale error as large as 0.2 mag per mag, which is unlikely, the excess is still a factor of 1.8 +/- 0.3. If real, this excess affects the interpretation of deep counts of field galaxies.
Geller Margaret J.
Huchra John P.
Marzke Ronald O.
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