Five E+A (post-starburst) galaxies as Brightest Cluster Galaxies
Abstract
Brightest Cluster Galaxies (BCGs) are mostly elliptical galaxies and very rarely have prominent star formation. We found that five out of 8,812 BCGs are E+A (i.e. post-starburst) galaxies, having the Hδ~absorption line with an equivalent width >2.5 and no distinct emission lines in [O II] and Hα. The E+A features we identified from the BCGs for the first time are not as significant as those in general galaxies, indicating that historically the star formation were not very violent.
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