Shape of the Galactic Orbits in Clusters

Abstract

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.

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

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Cited by in corpus (17)

• The ROSAT-ESO Flux Limited X-ray (REFLEX) Galaxy Cluster Survey. V. The cluster catalogue
• The HI Content of Spirals. II. Gas Deficiency in Cluster Galaxies
• The Dependence of Cluster Galaxy Star Formation Rates on the Global Environment
• The velocity and mass distribution of clusters of galaxies from the CNOC1 cluster redshift survey
• The ESO Nearby Abell Cluster Survey. XIII. The orbits of the different types of galaxies in rich clusters
• Signatures of Galaxy-Cluster Interactions: Spiral Galaxy Rotation Curve Asymmetry, Shape, and Extent
• Galaxy Orbits for Galaxy Clusters in Sloan Digital Sky Survey and 2dF Galaxy Redshift Survey
• Star formation activity and gas stripping in the Cluster Projected Phase-Space (CPPS)
• An ISOCAM survey through gravitationally lensing galaxy clusters. IV. Luminous infrared galaxies in Cl 0024+1654 and the dynamical status of clusters
• Shrinking of Cluster Ellipticals: a Tidal Stripping explanation and Implications for the Intra-Cluster Light
• Spatial and Kinematic Distributions of Transition Populations in Intermediate Redshift Galaxy Clusters
• Dynamical segregation of galaxies in groups and clusters
• Star formation activity of intermediate redshift cluster galaxies out to the infall regions
• Velocity dispersions and cluster properties in the SARS (Southern Abell Redshift Survey) clusters. Paper II
• Shape of the Galactic Orbits in the CNOC1 Clusters
• Are dumbbell brightest cluster members signposts to galaxy cluster activity?
• The distribution of lenticular galaxies in the phase space of present-day galaxy cluster regions