Abstract
Are we having a “biased” view of the universe because we have not surveyed the sky to a faint enough surface brightness level? Are the voids seen in the bright galaxy distribution filled with dwarf galaxies? In order to provide an answer to these questions, I have undertaken, in collaboration with S. E. Schneider, a 21-cm redshift survey of all galaxies classified by Nilson (1973) in the Uppsala General Catalog (UGC) as dwarf, magellanic irregular, or irregular galaxies, 1849 galaxies out of a total of ∼13000 galaxies of all morphological types in the UGC. The redshift survey thus defined avoids the selection effect against dwarf galaxies present in previous redshift surveys: the UGC is a diameter-limited catalog (it lists all galaxies with a blue diameter larger than 1 arc-minute visible on the Palomar Sky Survey Prints and north of δ = −2°30′) and thus does not discriminate against faint, low surface brightness dwarf galaxies, as is the case for magnitude-limited redshift surveys, such as the Center for Astrophysics (CfA) survey (de Lapparent et al. 1986).
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