We will ask a fundamental question: ie, how the star formation is truncated in cluster environment in the course of hierarchical assembly of dark matter haloes. This is the central question of the Butcher-Oemler effect and the environmental effect seen in local and distant clusters. We try to answer this fundamental question by comparing the galaxy properties in detail as a function of time (redshift) and the environment using the CNOC clusters data and our own Subaru wide-field data of distant clusters. We derive the global star formation history in clusters by sketching the flow of galaxies across the colour-magnitude plane over a large fraction of the Hubble time, and connect this to the large scale structure of clusters traced by the photometric redshift technique.
Studies of Galaxies in the Young Universe with New Generation Telescope
- Pub Date:
- February 2004