Datamining the Butcher-Oemler Effect

Details Datamining the Butcher-Oemler Effect Datamining the Butcher-Oemler Effect

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9612r&link_type=abstract

American Astronomical Society, AAS Meeting #211, #96.12; Bulletin of the American Astronomical Society, Vol. 39, p.902

Astronomy and Astrophysics

Astronomy

Scientific paper

The Butcher-Oemler effect is an enigmatic observable that shows different aspects in different environments. In our literature survey of several hundred clusters with published redshifts, a richness, and blue fraction we find an overall trend for higher redshift clusters to have a higher blue fraction than lower redshift systems. We also find this trend is mediated by the richness of the cluster: The largest clusters have low blue fractions at all redshifts, and the smallest have high blue fractions at all redshifts in our sample. In this poster we present initial two parameter fits to the Butcher-Oemler Effect, using richness and redshift to define overall trends in the evolution of cluster blue fraction.

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