Reconstructing the History of Star Formation in Rich Cluster Cores

Details Reconstructing the History of Star Formation in Rich Cluster Cores Reconstructing the History of Star Formation in Rich Cluster Cores

2000-05-19

arxiv.org/abs/astro-ph/0005397v3

Mon.Not.Roy.Astron.Soc.321:18,2001

Astronomy and Astrophysics

Astrophysics

20 pages, 12 figures, Accepted for Publication in MNRAS (first submitted on 9th Feb 2000)

Scientific paper

10.1046/j.1365-8711.2001.03981.x

We address the current crucial issues on the formation and evolution of cluster galaxies: ie., connection between the Butcher-Oemler effect, assembly of cluster galaxies, truncation of star formation, and the origin of S0 galaxies. We construct the field corrected colour-magnitude (CM) diagrams for 7 CNOC clusters (0.23M*+1). Truncation of star formation is, however, found to be relatively milder (with a time scale of 1 Gyr) than suggested by the viorent processes such as ram-pressure stripping and/or mergers/harassment. The BO effect is after all found to be a combination of three effects, namely, increasing field star formation activity, increasing galaxy infall rate, and the truncatin of star formation after the accretion. Our approach naturally leads to the history of galaxy assembly and `global' star foramtion for `cluster' galaxies.

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