Shape of the Galactic Orbits in Clusters

Details Shape of the Galactic Orbits in Clusters Shape of the Galactic Orbits in Clusters

1998-01-21

arxiv.org/abs/astro-ph/9801203v1

Astronomy and Astrophysics

Astrophysics

23 pages including 6 EPS-figures, and 4 tables. Accepted for publication by ApJ, April 1998

Scientific paper

10.1086/305395

A kinematical analysis applied to a sample of galaxy clusters indicates that the differences between the velocity distribution of elliptical and spiral galaxies are associated with the shape of their orbit families. The orbital anisotropies present on each morphological population could be measured with the use of a parameter which is the ratio of the radial and tangential velocity dispersions, and can be recovered through the observed line-of-sight velocity distribution. When a Gaussian velocity distribution is assumed, having different dispersions along the radial and tangential directions, we conclude that the orbits of elliptical galaxies in clusters are close to radial, while spirals have more circular shaped or isotropic orbits. Lenticulars galaxies shares an intermediate orbital parameter, between spirals and ellipticals.

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