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2003ApJ...598...20D - Astrophys. J., 598, 20-35 (2003/November-3)
The K-selected Butcher-Oemler effect.
DE PROPRIS R., STANFORD S.A., EISENHARDT P.R. and DICKINSON M.
Abstract (from CDS):
As a test of our methods, our data allow us to construct optically selected samples down to rest-frame MV=-20, as used by Butcher & Oemler, for four clusters that are common between our sample and theirs. For these rest-frame V-selected samples, we find similar fractions of blue galaxies to Butcher & Oemler, while the K-selected samples for the same four clusters yield blue fractions that are typically half as large. This comparison indicates that selecting in the K band is the primary difference between our study and previous optically based studies of the Butcher & Oemler effect. Selecting in the observed K band is more nearly a process of selecting galaxies by their mass than is the case for optically selected samples. Our results suggest that the Butcher-Oemler effect is at least partly due to low-mass galaxies whose optical luminosities are boosted. These lower mass galaxies could evolve into the rich dwarf population observed in nearby clusters.
Abstract Copyright: ∼
Journal keyword(s): Galaxies: Clusters: General - Galaxies: Evolution - Galaxies: Formation - Galaxies: High-Redshift
CDS comments: t.3 : MS 2137-0234 not found, could be MS 2137.3-2353, others misprints : MS 1054.5-0327 for 1054.4-0321, 1601+54 for 1601+42
Simbad objects: 35
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