Secular evolution in elliptical galaxies

Statistics – Computation

Scientific paper

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Elliptical Galaxies, Galactic Evolution, Interacting Galaxies, Kinematics, Morphology, Computational Astrophysics, Digital Simulation, Hubble Constant, Many Body Problem

Scientific paper

Recent qualitative analysis of the evolution of a conservative N-body dynamical system from one side and the study of the stochastic orbits in realistic galactic potentials on the other give the prediction of a collective relaxation time scale of the same order of magnitude and several orders of magnitudes shorter than the standard binary relaxation time. Here a study is presented of the applicability of these theories to elliptical galaxies, examining a sample of 25 well-studied objects with quite complete morphological and kinematical data. The correlation between the relaxation time-scales and the parameter (vm/(sigma))*, giving information on the relative importance of rotation and random velocity anisotropy, supports the possibility of secular evolution in a fraction of elliptical galaxies.

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