Merger origin for the velocity and density substructure in elliptical galaxies

Details Merger origin for the velocity and density substructure in elliptical galaxies Merger origin for the velocity and density substructure in elliptical galaxies

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.156..133b&link_type=abstract

(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Pheno

Astronomy and Astrophysics

Astrophysics

5

Elliptical Galaxies, Galactic Structure, Brightness Distribution, Density Distribution, Galactic Rotation, Velocity Distribution

Scientific paper

The dynamics of mergers between two unequal elliptical systems was studied with self-consistent numerical simulations. Comparisons of these models to real ellipticals are made in a variety of properties, which include the mean central surface brightness, the shape of the surface brightness profile, and the type of rotation curve and dispersion profile. Several proofs are given that the cores of smaller, denser ellipticals sink to the remnant's center virtually undisturbed, and create a core-within-a-core structure with definite signatures in the surface brightness profile and the velocity dispersion profile. Ellipticals with anomalous cores appear to be a natural outcome of this type of merger.

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