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S. Raychaudhury, S. C. Porter (University of Birmingham, UK)
Most galaxies lie in filamentary structures, often called superclusters, connecting rich clusters of galaxies, Simulations show that most galaxies are formed in groups on these filaments, and are gradually assimilated into the clusters connected to the filaments. We investigate the dependence of the rate of star formation in galaxies on their environment. Using simple indicators of star formation in galaxies belonging to the 2dF galaxy redshift survey and the Sloan Digital Sky survey, we analyze the variation of the rate of star formation in galaxies according to their position on these filaments, and also to the richness of the groups to which they belong. We find evidence of enhanced star formation in galaxies, belonging to supercluster filaments, on the immediate outskirts of clusters, and of suppressed star formation in their cores.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.