A catalog of low surface brightness galaxies - List II

Abstract

The second edition of a catalog of low surface brightness (LSB) galaxies is presented based on a visual search of the Second Palomar Sky Survey. This paper presents newly discovered LSB galaxies in 97 fields within the declination range of 0^deg^ to +25^deg^. The primary catalog (objects with diameters greater than 1 arcmin) contains 198 objects; the secondary catalog (30 arcsec < D < 1 arcmin) contains 140 objects. H I observations are presented for 171 of these newly discovered galaxies. Our 80% detection rate yields a fairly representative velocity distribution for a sample of LSB objects. The sample is dominated by LSB disks galaxies with 2000 < v < 9000 km s^-1^. Below 2000 km s^-1^ a few true dwarf galaxies are found. Approximately 10% of the sample has v > 10000 km s^-1^ and thus represents additional examples of truly large LSB galaxies. The H I redshift distribution is consistent with the hypothesis that LSB and HSB disk galaxies, in general, are drawn from the same distribution of physical size (e.g., disk scale length) modulo the curious tendency for the LSB sample to contain significantly more large-scale length galaxies which rival the prototype, Malin 1. Optical broadband and Hα imaging for a subset of the catalog is also presented confirming their quiescent nature. Our survey using the PSS-II is presently 35% complete and indicates that the UGC is 11.5% incomplete for a 1 mag arcsec^-2^ increase in surface brightness depth. Overall this survey demonstrates that LSB galaxies are not exclusively dwarf galaxies but encompass all Hubble types, although dominated by the late types, and all masses.