Tidal Torques and the Angular Momentum of Elliptcal Galaxies

Details Tidal Torques and the Angular Momentum of Elliptcal Galaxies Tidal Torques and the Angular Momentum of Elliptcal Galaxies

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.5214g&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #52.14; Bulletin of the American Astronomical Society, Vol. 26, p.1400

Astronomy and Astrophysics

Astronomy

Scientific paper

The behaviour of the angular momentum of a sample of elliptical galaxies is compared with theoretical predictions for tidal torques acting during the protogalactic phase as the source of galactic angular momentum (Heavens & Peacock, 1988). The large range in the observed angular momenta at a fixed mass scale is consistent with the predicted dispersion in the spin parameter lambda ~ J M(-5/3) . There is a trend for less massive galaxies to have larger lambda . This trend implies that, for this range of mass scales, the power spectrum is such that the higher torques acting on the higher density peaks dominate over the shorter collapse time during which torques can act. In order for the higher torque mechanism to dominate at the smaller mass scales, the slope of the power spectrum has to be shallow, possibly even shallower than that predicted for the CDM spectrum.

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