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An HI Selected Sample of Galaxies: The HI Mass Function and the Surface Brightness Distribution

Published online by Cambridge University Press:  16 May 2016

Martin Zwaan ,
Frank Briggs  and
David Sprayberry
Martin Zwaan
Affiliation:
Kapteyn Astronomical Institute, PO Box 800, NL-9700 AV Groningen, The Netherlands; [email protected].
Frank Briggs
Affiliation:
Kapteyn Astronomical Institute, PO Box 800, NL-9700 AV Groningen, The Netherlands; [email protected].
David Sprayberry
Affiliation:
Kapteyn Astronomical Institute, PO Box 800, NL-9700 AV Groningen, The Netherlands; [email protected].
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Abstract

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Results from the Arecibo HI Strip Survey, an unbiased extragalactic HI survey, combined with optical and 21 cm 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-mag arcsec−2, even though there is no observational selection against them.

Type
HI in the Local Universe
Information
Publications of the Astronomical Society of Australia , Volume 14 , Issue 1 , 1997 , pp. 126 - 129
Copyright
Copyright © Astronomical Society of Australia 1997

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