Galaxy mass distributions for some extreme orbital-speed Profiles

Abstract

Extreme speed profiles, that are impossible to anayze correctly using the usual methods, are shown to be easily handled using the methods developed previously by Nicholson (astro-ph/0006330). These profiles are constant orbital speeds with sharp and smooth ramps at the origin, and constant angular velocity with speeds increasing linearly to the galaxy rim. Also an example using measured data for a real galaxy is shown for NGC 3198. A new format is presented to show results in dimensionless form, that includes a way to show SMD results so they are easily compared. Based on repeated trials for accuracy, the rod representing the mass of a fundamental segment is now placed at 0.575*dr at the center ring of a galaxy.