.. - :

 

:

 

1. Bisnovatyi-Kogan, Gennady S.; Merafina, Marco; Vaccarelli, Maria Rosaria; Spherically Symmetric Stellar Clusters with Anisotropy and Cutoff Energy in Momentum Distribution. I. The Newtonian Regime; The Astrophysical Journal, Volume 703, Issue 1, pp. 628-632 (2009).

 

Abstract

We construct numerical models of spherically symmetric Newtonian stellar clusters with anisotropic distribution functions. These models generalize solutions obtained earlier for isotropic Maxwellian distribution functions with an energy cutoff and take into account distributions with different levels of anisotropy.

 

2. Bisnovatyi-Kogan, Gennady S.; Merafina, Marco; Vaccarelli, Maria Rosaria; Spherically Symmetric Stellar Clusters with Anisotropy and Cutoff Energy in Momentum Distribution. II. The Relativistic Regime; The Astrophysical Journal, Volume 709, Issue 2, pp. 1174-1182 (2010).

 

Abstract

We numerically construct models of spherically symmetric relativistic stellar clusters with anisotropic distribution functions. Newtonian solutions obtained in Paper I are generalized as isotropic Maxwellian ones with energy cutoff in their distribution function. We consider distributions with different levels of anisotropy and discuss some general characteristics of the models.

 

3. Merafina, Marco; Bisnovatyi-Kogan, Gennady S.; Vaccarelli, Maria Rosaria; Relativistic Stellar Clusters: Equilibrium Models with Anisotropic Momentum Distribution and Dynamic and Thermodynamic Stability of Isotropic Models; in Astrophysics and Cosmology after Gamow: Proceedings of the 4th Gamow International Conference on Astrophysics and Cosmology After Gamow and the 9th Gamow Summer School Astronomy and Beyond: Astrophysics, Cosmology, Radio Astronomy, High Energy Physics and Astrobiology; AIP Conference Proceedings, Volume 1206, pp. 399-416 (2010).

 

Abstract

Models of spherically symmetric relativistic stellar clusters with anisotropic distribution functions in relativistic regime are described by using Maxwellian distribution function with energy cutoff. We consider distributions with different levels of anisotropy and discuss some general characteristics of the models. In addition, we analyze dynamic and thermodynamic stability of isotropic models still described by Maxwellian distribution function with energy cutoff and we find critical values of the onset of instability.