A redshift survey of low-surface-brightness galaxies. I - The basic data

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Brightness Distribution, Galactic Clusters, Red Shift, Space Observations (From Earth), Spiral Galaxies, Astronomical Catalogs, Dwarf Galaxies, Luminosity, Optical Properties

Scientific paper

The authors present the initial results from a 21 cm redshift survey of very low-surface-brightness galaxies that are contained in the Uppsala General Catalog of Galaxies. The selection criteria and detection statistics as a function of the optical properties of this sample are fully discussed. The redshift distribution for this sample of 375 galaxies exhibits a pronounced peak at 5000 km s-1, corresponding to the well-studied Perseus-Pisces supercluster. The overall detection rate was 65% and the bulk of the detections are genuine low-surface-brightness spiral galaxies, many with linewidths in excess of 300 km s-1, as opposed to true dwarf galaxies. The authors argue that most of their nondetections are unlikely to be gas-poor dwarfs but instead are galaxies with velocities beyond 10000 km s-1. Taken as a whole, this sample demonstrates that optical surface brightness is not necessarily a reliable indicator of intrinsic luminosity or mass.

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