An HI Selected Sample of Galaxies: The HI Mass Function and the Surface Brightness Distribution
- 1 January 1997
- journal article
- Published by Cambridge University Press (CUP) in Publications of the Astronomical Society of Australia
- Vol. 14 (1) , 126-129
- https://doi.org/10.1071/as97126b
Abstract
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.Keywords
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