The sigma_c-V_c correlation in high and low surface brightness galaxies

Details The sigma_c-V_c correlation in high and low surface brightness galaxies The sigma_c-V_c correlation in high and low surface brightness galaxies

2003-11-03

arxiv.org/abs/astro-ph/0311023v1

Astronomy and Astrophysics

Astrophysics

2 pages, 2 figures, to appear in Proc. IAU Symp. 220, "Dark Matter in Galaxies" eds. S. Ryder, D.J. Pisano, M. Walker, & K. Fr

Scientific paper

We investigate the relation between the central velocity dispersion, sigma_0, and the circular velocity, V_c, 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 sigma_0 galaxies, always rejected in the previous studies. Low surface brightness galaxies seem to behave differently, showing either higher values of V_c or lower values of sigma_0 with respect to their high surface brightness counterparts.

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