The vc-sigmac relation in low mass and low surface brightness galaxies
Abstract
We present an updated investigation of the relation between large scale disk circular velocity, vc, and bulge velocity dispersion, sigmac. New bulge velocity dispersions are measured for a sample of 11 low surface brightness (LSB) and 7 high surface brightness (HSB) spiral galaxies for which vc is known from published optical or HI rotation curves. We find that, while LSB galaxies appear to define the upper envelope of the region occupied by HSB galaxies (having relatively larger vc for any given sigmac), the distinction between LSB and HSB galaxies in the vc-sigmac plane becomes less pronounced for sigmac <= 80 km/s. We conclude that either the scatter of the vc-sigmac relation is a function of vc (and hence galaxy mass) or that the character of the vc-sigmac relation changes at vc ~ 80 km/s. Some inplications of our findings are discussed.
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