Understand
The distribution of galaxies in position and velocity around the centers of galaxy clusters encodes important information about cluster mass and structure.
- Using the maxBCG galaxy cluster catalog identified from imaging data obtained in the Sloan Digital Sky Survey, we study the BCG-galaxy velocity correlation function.
- By modeling its non-Gaussianity, we measure the mean and scatter in velocity dispersion at fixed richness.
- The mean velocity dispersion increases from 202+/-10 km/s for small groups to more than 854+/-102 km/s for large clusters.
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