Low Surface Brightness Galaxies in the Local Universe. III. Implications for the Field Galaxy Luminosity Function

Abstract

We present a luminosity function for low surface brightness (LSB) galaxies identified in the APM survey of Impey et al 1996. These galaxies have central surface brightnesses in B in the range 22 < mu < 25. Using standard maximum-likelihood estimators, we determine that the best-fit Schechter function parameters for this luminosity function (LF) are alpha = -1.42, M* = -18.34, and phi* = 0.0036, assuming H_0 = 100. We compare these results to those of other recent studies and find that surveys which do not take account of the observation selection bias imposed by surface brightness are missing a substantial fraction of the galaxies in the local universe. Under our most conservative estimates, our derivation of the LF for LSB galaxies suggests that the CfA redshift survey has missed at least one third of the local galaxy population. This overlooked fraction is not enough by itself to explain the large number of faint blue galaxies observed at moderate redshift under no-evolution models, but it does help close the gap between local and moderate-redshift galaxy counts.

23 pages including 8 figures and 1 table, LaTeX, style file dspp4.sty included, complete PostScript file available at ftp://lplx06.ing.iac.es/pub/dspray/lsb/lumfunc/preprint.ps.gz , Accepted by ApJ, scheduled for June 1 1997

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