Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-10-04
Astrophys.Space Sci. 269 (1999) 569-576
Astronomy and Astrophysics
Astrophysics
8 pages, 2 figures. To appear in the conference proceedings of "Toward a New Millennium in Galaxy Morphology" edited by D.L. B
Scientific paper
10.1023/A:1017043701971
The local space density of galaxies as a function of their basic structural parameters -luminosity, surface brightness and scale size- is still poorly known. Our poor knowledge is the result of strong selection biases against low surface brightness and small scale size galaxies in any optically selected sample. We derive bivariate space density distributions by correcting a sample of ~1000 local Sb-Sdm spiral galaxies for its selection effects. We present a parameterization of these bivariate distributions, based on a Schechter type luminosity function and a log-normal scale size distribution at a given luminosity. We next calculate the bivariate distributions as function of redshift using the Hubble Deep Field, and conclude that at higher redshift there is a decrease in space density of luminous, large scale size galaxies, but the density of smaller galaxies stays nearly the same.
de Jong Roelof S.
Lacey Cedric
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