Roy Gal (IfA)

The ORELSE Survey: Galaxy Evolution in Large Scale Structures at z~1

The large scale structures around clusters at z~1 contain the galaxies
that will infall into the cluster cores and form the cluster
population observed today. Thus, the LSS around high-redshift clusters
offers the unique opportunity to probe, over the full range of
environments, the physical effects on galaxies as they assemble into
denser regions. The Observations of Redshift Evolution in Large Scale
Environments (ORELSE) survey, is a systematic search for such
structures on scales > 10 Mpc around 20 known clusters at 0.6 < z <
1.3. Covering a total of 5 square degrees, with deep optical imaging,
Spitzer IRAC maps, Chandra and VLA observations, and most uniquely
100-200 (or more) spectroscopically confirmed members in each system,
this is the largest sample of galaxies in the historically neglected
intermediate-density regions of the Universe. I will describe the
survey and the results on environmental effects on galaxy properties
such as colors, starbursts, and AGN activity.