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Paper: Radio Emission and the Butcher-Oemler Effect in Abell 2125
Volume: 176, Observational Cosmology: The Development of Galaxy Systems
Page: 83
Authors: Ledlow, M. J.; Owen, F. N.; Dwarakanath, K. S.; Keel, W. C.; Morrison, G. E.
Abstract: We present radio, optical, and X-ray observations of the Butcher-Oemler cluster Abell 2125. We find an interesting correlation between an excess of radio galaxies, X-ray substructure and an apparent ongoing cluster merger. Interestingly, the excess radio galaxy population appears to be nearly evenly divided between blue, star-forming disk galaxies and red cluster ellipticals. It appears that whatever mechanisms are responsible for the Butcher-Oemler effect in this cluster also stimulate weak AGN emission in these cluster ellipticals. Observations suggest that we may have caught this cluster in the act, in that the signatures of the enhanced activity may have occurred fairly recently (within the last few × 10^8 years), and detailed observations may provide important clues as to the cause of the excess activity. We review several possible mechanisms and compare to the observed properties of this cluster.
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