NOAO >   Observing Info >   Approved Programs >   2006A-0411

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Proposal Information for 2006A-0411


PI: Simona Mei, Johns Hopkins University, smei@pha.jhu.edu
Address: Departement of Physics and Astronomy, 3400, N Charles Street, Baltimore, MD 21218, USA

CoI: John Blakeslee, Washinton State University
CoI: Holland Ford, Johns Hopkins University
CoI: Nicole Homeier, Johns Hopkins University
CoI: Marc Postman, Space Telescope Science Institute
CoI: Piero Rosati, European Southern Observatory
CoI: Ricardo Demarco, Johns Hopkins University
CoI: Peter Eisenhardt, JPL
CoI: Myungkook J. Jee, Johns Hopkins University
CoI: Bradford Holden, University of California - Santa Cruz
CoI: Tadayuki Kodama, NAOJ
CoI: Fumiaki Nakata, NAOJ
CoI: Masayuki Tanaka, University of Tokyo
CoI: Richard L. White, Space Telescope Science Institute

Title: Galaxy transformation in groups at z > 1

Abstract: The discovery of five galaxy groups in the Lynx supercluster region opens the exciting opportunity to observe, for the first time, groups in the process of accreting into a merging pair of clusters at z > 1. Modern concepts of structure formation suggest that substantial evolution of galaxy properties can occur in groups and filaments well before they enter the environs of massive clusters. This scenario can be tested directly by observing these high redshift groups, in the early phases of galaxy transformation. Our team has already constructed a treasure of X-ray/optical/IR data in this region and it will be augmented by recently allocated observations with the HST/ACS and Spitzer/IRAC and MIPS. Our objective here is to obtain spectroscopy of the brightest galaxies in each group in order to measure star formation rates and precise redshifts. These GMOS observations are essential in order to conclusively determine whether significant galaxy evolution occurs mostly prior to entry into the densest regions and also to constrain the relative importance of initial conditions in determining the fate of galaxy systems.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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