The Vc-sigmac relation in high and low surface brightness galaxies
Abstract
We investigate the relation between the asymptotic circular velocity, Vc, and the central stellar velocity dispersion, sigmac, in galaxies. We consider a new sample of high surface brightness spiral galaxies (HSB), low surface brightness spiral galaxies (LSB), and elliptical galaxies with HI-based Vc measurements. We find that: 1) elliptical galaxies with HI measurements fit well within the relation; 2) a linear law can reproduce the data as well as a power law (used in previous works) even for galaxies with sigmac < 70 km/s; 3) LSB galaxies, considered for the first time with this respect, seem to behave differently, showing either larger Vc values or smaller sigmac values.
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