The collapse and formation of galaxies. II - A control parameter for the Hubble sequence. III - The origin of the Hubble sequence

Details The collapse and formation of galaxies. II - A control parameter for the Hubble sequence. III - The origin of the Hubble sequence The collapse and formation of galaxies. II - A control parameter for the Hubble sequence. III - The origin of the Hubble sequence

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1581l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, Nov. 1988, p. 1581-1592. Research supported by AT&T Bell Laboratories, Nelson Sl

Astronomy and Astrophysics

Astronomy

23

Disk Galaxies, Galactic Evolution, Gravitational Collapse, Hubble Diagram, Many Body Problem, Angular Momentum, Dark Matter, Elliptical Galaxies, Luminosity, Red Shift, Star Distribution, Velocity Distribution

Scientific paper

The authors use fully self-consistent N-body simulations of gas and dark matter to examine the origin of the Hubble sequence. The models simulate a small volume of the universe that is sufficiently overdense to form a galaxy. The models show the full range of types from pure disks to pure spheroids. The initial velocity dispersion of the dark matter is the most important parameter for determining the final morphology of the galaxy. The principal quantitative result of these experiments is that disks and spheroids are determined by a critical velocity dispersion at turnaround equal to 20% of the final velocity dispersion in the virialized halo. When the velocity dispersion is less than this value, the result is a dense, slowly rotating spheroid.

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