Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.2101r&link_type=abstract
American Astronomical Society, AAS Meeting #212, #21.01; Bulletin of the American Astronomical Society, Vol. 40, p.218
Astronomy and Astrophysics
Astronomy
Scientific paper
While it is well documented that galaxy clusters have a generally bluer population at higher redshifts then in the current epoch, detailed analysis of how blue fraction changes as a function of redshift, cluster size, and cluster concentration has not been possible with current data sets. The difficulties come from many directions, but the dominant problem is different teams classify blue fraction using different criteria, leading to results that show consistent trends with inconsistent numbers. What is needed for a statistically significant understanding of the Butcher-Oemler effect is large, self-consistent set of blue fractions over a range of cluster types and a variety of distances.
In this paper we identify a way to do this using the Sloan Digital Sky Survey to replicate Butcher and Oemlers study, and compare our technique's results to their results for a set of 12 clusters. The SDSS has limiting magnitudes of g=22.2, r=22.2, i=21.3. This means that Butcher and Oemler's original Mv=-20 limiting magnitude is only visible out to about z 0.4. To do our study we are assuming a flat geometry and are converting all of Butcher and Oemler's B-V cut offs to SDSS g-r cut offs. In this paper we outline our methodologies and outline ways to pipeline our results to systematically study large numbers of clusters.
Gay Pamela
Russell Brian
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