The K-selected Butcher-Oemler Effect

Details The K-selected Butcher-Oemler Effect The K-selected Butcher-Oemler Effect

2003-07-31

arxiv.org/abs/astro-ph/0307545v1

Astrophys.Space Sci.285:43-47,2003

Astronomy and Astrophysics

Astrophysics

37 pages, 19 figures, ApJ accepted (vol 598 n1)

Scientific paper

10.1023/A:1024661826229

[abridged] We investigate the Butcher-Oemler effect in a sample of K-selected galaxies in 33 clusters at 0.15 < z < 0.92. We attempt to duplicate the original Butcher-Oemler analysis as closely as possible given the characteristics of our data. We find that the infrared selected blue fractions are lower than those measured in the optical and that the trend with redshift is much weaker. Comparison with optical data in clusters in common with Butcher & Oemler (1984) shows that infrared selection is the primary difference between our study and optically selected samples. We suggest that the Butcher-Oemler effect is in large part due to a population of star-forming low mass galaxies which will evolve into dwarf galaxies. These early results point to the need for larger and deeper infrared samples of cluster galaxies to address this issue

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