Conjectures on the ellipticity of cD galaxies

Details Conjectures on the ellipticity of cD galaxies Conjectures on the ellipticity of cD galaxies

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..64..509d&link_type=abstract

Astrophysics and Space Science, vol. 64, no. 2, Aug. 1979, p. 509-512.

Astronomy and Astrophysics

Astrophysics

Elliptical Galaxies, Galactic Clusters, Galactic Evolution, Galactic Structure, Angular Momentum, Galactic Nuclei, Galactic Rotation, Jeans Theory

Scientific paper

A possible explanation is proposed for the observed peculiar flattening of some cD galaxies and for their alignment with the cluster's overall rotation. In the mechanism suggested, a cluster-sized protocloud experiencing Jeans instability will break down into galaxies. For a rotating protocloud, the galaxy that forms at the center (which in rich clusters is a cD) will carry, essentially, intrinsic angular momentum, while other galaxies, in addition, will carry orbital angular momentum. As a result, the cD will be oriented in the same way as the cluster, and the resulting flattening will be greater than may be expected from tidal theory.

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