Gravothermal catastrophe in anisotropic systems.

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Stellar Systems: Instabilities, Stellar Systems: Numerical Simulations

Scientific paper

The authors investigate the gravothermal instability of spherical stellar systems endowed with an anisotropic velocity distribution, focussing their attention on the connections between the conditions for the onset of the gravothermal instability and the amount of anisotropy globally present inside the system. The investigation has been carried out by the method of linear series, introduced by Poincare in 1885. By studying the influence of the internal kinematics on the global features of these models the authors have found out that a greater number of radial orbits affect the process in a dramatic way, in the sense that the stronger is the anisotropy the sooner a system looses stability (where the word "sooner" means for smaller central potentials). As a final step, the authors evaluated the stability of these systems with respect to the radial-orbit instability, a dynamical process occurring because of the anisotropy that leads to a modification of their internal structure, and such results have been compared with those coming from the former analysis, to exclude the presence of this second phenomenon during the study of the gravothermal catastrophe.

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