We investigate the relation between the central velocity dispersion, σ_c, and the circular velocity, V_circ, in galaxies. In addition to previously obtained data, we consider an observationally homogeneous 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 σ_c galaxies, always rejected in the previous studies. Low surface brightness galaxies seem to behave differently, showing either higher values of V_circ or lower values of σ_c with respect to their high surface brightness counterparts.
The σ_c-V_circ correlation in high and low surface brightness galaxies
PIZZELLA, ALESSANDRO;DALLA BONTA', ELENA;CORSINI, ENRICO MARIA;COCCATO, LODOVICO;BERTOLA, FRANCESCO
2004
Abstract
We investigate the relation between the central velocity dispersion, σ_c, and the circular velocity, V_circ, in galaxies. In addition to previously obtained data, we consider an observationally homogeneous 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 σ_c galaxies, always rejected in the previous studies. Low surface brightness galaxies seem to behave differently, showing either higher values of V_circ or lower values of σ_c with respect to their high surface brightness counterparts.
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