, even though there is no
observational selection against them.
Next Section: Introduction
Martin Zwaan,
Frank Briggs and
David Sprayberry
Kapteyn Astronomical Institute
P.O. Box 800, NL-9700 AV Groningen, The
Netherlands
zwaan@astro.rug.nl, fbriggs@astro.rug.nl, dspray@astro.rug.nl
Results from the Arecibo HI Strip Survey, an unbiased extragalactic
HI survey, combined with optical and 21cm follow-up observations,
determine the HI Mass Function and the cosmological mass density of
HI at the present epoch. Both are consistent with earlier estimates,
computed for the population of optically selected galaxies. This
consistency occurs because, although the distribution of optical central
surface brightnesses among galaxies is flat, we fail to find a
population of galaxies with central surface brightnesses fainter than
24 B-, even though there is no
observational selection against them.
Keywords: Galaxies: Luminosity Function, Mass Function; Surveys
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