Dynamics of Galaxy Clusters in Wide-field Galaxy Surveys

Details Dynamics of Galaxy Clusters in Wide-field Galaxy Surveys Dynamics of Galaxy Clusters in Wide-field Galaxy Surveys

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.7804h&link_type=abstract

American Astronomical Society, AAS Meeting #211, #78.04; Bulletin of the American Astronomical Society, Vol. 39, p.869

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a kinematic analysis of galaxy clusters using a spectroscopic sample of galaxies in Sloan Digital Sky Survey (SDSS) and Two Degree Field Galaxy Redshift Survey (2dFGRS). We have selected the member galaxies of more than 850 Abell clusters covered by these surveys using the galaxies' redshift and positional data for kinematic analysis. First, we search for galaxy clusters that show an indication of global rotation. We find 12 tentative rotating clusters with large ratios of rotation amplitude to dispersion and large velocity gradients. Of the 12 tentative rotating cluster, we have selected six probable rotating clusters (A954, 1139, 1399, 2162, 2169, and 2366) that show a single number-density peak around the cluster center with a spatial segregation of high- and low-velocity galaxies. Secondly, we investigate the galaxy orbits in galaxy clusters. We determine the galaxy orbits for ten clusters with constant and variable velocity anisotropy over the clustercentric radius using the Jeans equation. Using all member galaxies, the majority of clusters are found to have isotropic orbits. The galaxy orbits of early- and late-type galaxies appear to be different depending on clusters.

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