Unraveling the kinematics of early-type galaxies - Presentation of a new method and its application to NGC4621

Bender, R. 1990, Astr. Ap. 229, 441.

A new technique to analyze the kinematics of early-type galaxies is presented. The method is shown to be superior to classical methods because of its low sensitivity to template mismatching and its ability to unravel the line-of-sight integrated velocity distributions of early-type galaxies. The Fourier correlation quotient method is used to analyze the kinematics of NGC4621 along the projected major axis. The ratio of projected rotation velocity to projected velocity dispersion indicates that the flattening of NGC4621 is due to rotation. Explanations for the observed asymmetry of the velocity distributions along the line of sight are considered.