The sigmac-Vc correlation in high and low surface brightness galaxies
A. Pizzella, E. Dalla Bonta', E. M. Corsini, L. Coccato, F. Bertola
Abstract
We investigate the relation between the central velocity dispersion, sigma0, and the circular velocity, Vc, in galaxies. In addition to previously available data, we consider an observationally homogeneus sample of 52 high surface brightness and 11 low surface brightness spiral galaxies. We performed a straight line regression analysis in a linear scale, finding a good fit, also for low sigma0 galaxies, always rejected in the previous studies. Low surface brightness galaxies seem to behave differently, showing either higher values of Vc or lower values of sigma0 with respect to their high surface brightness counterparts.
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