The gravitational collapse of gaseous spheres and galaxy formation

Details The gravitational collapse of gaseous spheres and galaxy formation The gravitational collapse of gaseous spheres and galaxy formation

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356...41c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 356, June 10, 1990, p. 41-48.

Astronomy and Astrophysics

Astrophysics

5

Galactic Evolution, Gravitational Collapse, Mass Distribution, Cosmology, Density Distribution, Galactic Mass, Milky Way Galaxy, Stellar Mass

Scientific paper

The spherical collapse of a gas cloud initially in hydrostatic equilibrium is examined using self-similar solutions. It is found that the collapse of gas clouds to form galaxies can occur on a hydrodynamic time scale only if the gas dominates the gravitational field and the inflow forms a central dominant mass. The likelihood of a collisionless component and the observation of extended mass distributions in galaxies implies that the collapse of a hot protogalactic cloud is cooling-regulated. The formation of the Galaxy from an initially smooth, hot cloud is examined, showing that some nonlinear substructure must initially be present.

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