NOAO >   Observing Info >   Approved Programs >   2009A-0221

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Proposal Information for 2009A-0221


PI: Michael Balogh, University of Waterloo, mbalogh@uwaterloo.ca
Address: Department of Physics and Astronomy, 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. The reason for this is unknown, but tremendously important theoretically, since groups dominate the population today. Observable properties such as the colours and masses of group galaxies over 0.2<z<1 are able to put strong constraints on galaxy formation models. We have completed the low-redshift portion of this programme on Magellan and VLT (0.2<z<0.55), and these data have guided important modifications to these models. However, there remain degeneracies that cannot be resolved with these data; these require observations at z>0.6, where the mode of star formation is very different from today, and groups actually encourage starburst activity. We propose a 3 year campaign on GMOS to follow up 20 spectroscopically confirmed X-ray groups at 0.6<z<0.9, selected from very deep XMM and Chandra imaging of the CNOC2 survey fields. This semester's proposal is for classical mode follow-up spectroscopy of six groups.


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