Collapses of stellar protogalaxies from aspheric initial conditions

Details Collapses of stellar protogalaxies from aspheric initial conditions Collapses of stellar protogalaxies from aspheric initial conditions

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244...33m&link_type=abstract

Astrophysical Journal, Part 1, vol. 244, Feb. 15, 1981, p. 33-39.

Astronomy and Astrophysics

Astrophysics

15

Collapse, Galactic Evolution, Galactic Rotation, Stellar Motions, Astronomical Models, Astrophysics, Protostars, Spherical Harmonics, Universe

Scientific paper

Numerical experimens are presented which were intended to verify the independence of bar formation in rotating galaxy models from special initial conditions. Three-dimensional n-body programs were run starting from aspherical initial conditions characterized by particle rotational and peculiar velocities and offsets from sphericity for a set of 100,000 particles. All the initial configurations examined are observed to collapse to a thin form, overshoot, collapse again and again overshoot, with diameters and central densities similar to those observed under spheric initial conditions. Every aspheric collapse is also found to result in bar formation within two rotation periods, which is even sooner than in initially spherical conditions. In the intermediate stages of collapse, transient sheet patterns are found to be destroyed at asymmetries of 2-3%, while transient rings survived asymmetries of 6-7% but not 15-18%. It is noted that the results may be applicable to galaxy formation in the early universe, and possible mechanisms for the arresting of protogalactic collapse are indicated.

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