CD galaxy formation and dissipationless collapse

Details CD galaxy formation and dissipationless collapse CD galaxy formation and dissipationless collapse

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.243..629r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 243, April 15, 1990, p. 629-636. Research supported by

Astronomy and Astrophysics

Astronomy

20

Dark Matter, Galactic Clusters, Galactic Evolution, Galactic Structure, Gravitational Collapse, Interacting Galaxies, Angular Momentum, Elliptical Galaxies, Hubble Constant

Scientific paper

There is strong new evidence that first-ranked galaxies are aligned with their parent cluster and with the direction of the nearest-neighbor cluster and that the average ellipticity of first-ranked ellipticals is a strongly increasing function of radius. The alignment effect is limited to first-ranked galaxies and is stronger for cD and gE galaxies than for first-ranked galaxies of later type. In hierarchical clustering scenarios like the cold dark matter theory, clusters of galaxies are expected to have moderate asphericity. Numerical results of a study of the dissipationless collapse of moderately aspherical systems are presented which indicate that the central part of the collapsed and virialized system does show the large-scale elongation imposed by the initial conditions if the system is prolate. The increasing ellipticity is reproduced as a function of radius that is observed for brightest cluster ellipticals. The implications of these results for the formation of first-ranked galaxies in clusters are discussed.

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