Black holes and the shapes of galaxies

Details Black holes and the shapes of galaxies Black holes and the shapes of galaxies

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...296...20n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 296, Sept. 1, 1985, p. 20-34.

Astronomy and Astrophysics

Astronomy

64

Black Holes (Astronomy), Galactic Structure, Many Body Problem, Particle Trajectories, Celestial Mechanics, Elliptical Galaxies, Galactic Nuclei, Stellar Models

Scientific paper

The effect of a massive central black hole on the structure of a triaxial galaxy is studied using both test-particle integrations in a fixed potential and N-body simulations. For a black hole of a few tenths of the core mass, the galaxy becomes significantly rounder out to at least five core radii, by an amount of the order of one ellipticity subclass. The change in ellipticity is roughly proportional to the mass of the black hole and does not depend sensitively on the initial geometry of the galaxy (prolate or oblate). It is predicted that detailed studies of the isophotes of radio-loud ellipticals should show a small but perceptible increase in roundness at small radii.

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