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- W2060884670 abstract "The presence of multiple luminous galaxies in clusters can be explained by the finite time over which a galaxy sinks to the center of the cluster and merges with the the central galaxy. The simplest measurable statistic to quantify the dynamical age of a system of galaxies is the luminosity (magnitude) gap, which is the difference in photometric magnitude between the two most luminous galaxies. We present a simple analytical estimate of the luminosity gap distribution in groups and clusters as a function of dark matter halo mass. The luminosity gap is used to define fossil groups; we expect the fraction of fossil systems to exhibit a strong and model-independent trend with mass: ~1-3% of massive clusters and ~5-40% of groups should be fossil systems. We also show that, on cluster scales, the observed intrinsic scatter in the central galaxy luminosity-halo mass relation can be ascribed to dispersion in the merger histories of satellites within the cluster. We compare our predictions to the luminosity gap distribution in a sample of 730 clusters in the Sloan Digital Sky Survey C4 Catalog and find good agreement. This suggests that theoretical excursion set merger probabilities and the standard theory of dynamical segregation are valid on cluster scales." @default.
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- W2060884670 date "2006-01-17" @default.
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- W2060884670 title "Cluster Merger Variance and the Luminosity Gap Statistic" @default.
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- W2060884670 doi "https://doi.org/10.1086/500547" @default.
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