An HI selected sample of galaxies -- The HI mass function and the surface brightness distribution
Abstract
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-mag arcsec^-2, even though there is no observational selection against them.
- Publication:
-
Publications of the Astronomical Society of Australia
- Pub Date:
- April 1997
- DOI:
- 10.1071/AS97126b
- arXiv:
- arXiv:astro-ph/9701175
- Bibcode:
- 1997PASA...14..126Z
- Keywords:
-
- GALAXIES: LUMINOSITY FUNCTION;
- MASS FUNCTION: SURVEYS;
- Astrophysics
- E-Print:
- 5 pages, including 3 encapsulated postscript figures. Presented at the workshop `HI in the Local Universe', Sydney, May 13-15 1996. Accepted for publication by PASA. Also available from http://www.atnf.csiro.au/Publications/HI_workshop/proceedings.html