NOAO >   Observing Info >   Approved Programs >   2010A-0250

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Proposal Information for 2010A-0250


PI: Michael Balogh, University of Waterloo, mbalogh@uwaterloo.ca
Address: Department of Physics and Astronomy, Astronomy Group, Waterloo, Ontario, N2L 3G1, Canada

CoI: Sean McGee, University of Waterloo
CoI: Laura Parker, McMaster University
CoI: Richard Bower, University of Durham
CoI: John Mulchaey, Carnegie Institution of Washington (Carnegie Obs.)
CoI: Alexis Finoguenov, MPE, Garching
CoI: Dave Wilman, MPE, Garching
CoI: Jennifer Connelly, MPE, Garching

Title: The transition of galaxy groups from an invigorating environment to a suffocating one

Abstract: At low redshift, galaxy groups are hostile environments, gradually shutting down star formation activity; but at z=1 there is evidence that groups actually induce star formation in massive galaxies. While much can be learned about this important process from wide-field, sparsely sampled redshift surveys, a complementary and necessary approach is to study a smaller, pure sample of groups in detail. Only then is it possible to robustly measure the group mass, centre and radius, and the group-to-group variations predicted by simple infall models. We propose to continue a 3 semester programme begun in 09A, to study galaxies in 16 groups at 0.8<z<1, selected from ultradeep X-ray observations. With the available data we will be able to measure the dynamical mass, stellar mass fraction, star formation rate, and the fraction of "evolved" galaxies in these 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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