The number, luminosity, and mass density of spiral galaxies as a function of surface brightness

Details The number, luminosity, and mass density of spiral galaxies as a function of surface brightness The number, luminosity, and mass density of spiral galaxies as a function of surface brightness

1995-11-02

arxiv.org/abs/astro-ph/9511010v1

Mon.Not.Roy.Astron.Soc. 280 (1996) 337

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS. Uuencoded compressed tarred postscript. Also available at http://www.ast.cam.ac.uk/preprint

Scientific paper

I give analytic expressions for the relative number, luminosity, and mass density of disc galaxies as a function of surface brightness. These surface brightness distributions are asymmetric, with long tails to lower surface brightnesses. This asymmetry induces systematic errors in most determinations of the galaxy luminosity function. Galaxies of low surface brightness exist in large numbers, but the additional contribution to the integrated luminosity density is modest, probably 10 -- 30%.

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