Collapse and violent relaxation of a spherical protogalaxy

Details Collapse and violent relaxation of a spherical protogalaxy Collapse and violent relaxation of a spherical protogalaxy

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.189..737h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 189, Dec. 1979, p. 737-749.

Astronomy and Astrophysics

Astronomy

18

Astronomical Models, Galactic Evolution, Galactic Structure, Gravitational Collapse, Relaxation (Mechanics), Boundary Value Problems, Density Distribution, Dynamic Stability, Space Density, Spheres, Steady State, Stellar Evolution

Scientific paper

An investigation of the collapse and violent relaxation of a spherical protogalaxy is presented. The method in which the Vlasov and Poisson equations are solved in a three-dimensional phase space is used, showing that the steady state obtained depends on the initial conditions and can be made to agree with observations of the density profile in E galaxies without assuming matter infall or star formation during the collapse. The steady state is not in a complete or local thermodynamic equilibrium and it is found that the moment approach or the hydrodynamic approximation neglects some essential features of the collapse. It is concluded that the relaxation proceeds from the high energy towards the low energy stars, and from long spatial wavelengths towards short ones.

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