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Determination of Young Population Ages in Cluster Galaxies
Published online by Cambridge University Press: 07 August 2017
Extract
The “Butcher–Oemler” effect was originally defined as the excess of blue galaxies observed in distant rich clusters when compared to local counterparts. Subsequent observations revealed that a larger fraction of objects in clusters between 0.1 < z < 1 show signs in their spectra of the presence of young stars, i.e. of a recent (during the last 2 Gyrs) or current burst of star formation.
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- Copyright © Kluwer 1995