NOAO >   Observing Info >   Approved Programs >   2013B-0120

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Proposal Information for 2013B-0120


PI: Robert Sharp, Australian National University, rgs@mso.anu.edu.au
Address: Research School of Astronomy & Astrophysics, Mount Stromlo Observatory Cotter Road, Weston Creek, ACT 2611, Australia

CoI: Peter McGregor, Australian National University
CoI: Karl Glazebrook, Swinburne University of Technology
CoI: Roberto Abraham, University of Toronto
CoI: Mark Brodwin, University of Missouri
CoI: Matthew Bayliss, Harvard-Smithsonian Center for Astrophysics
CoI: Brian Stalder, Harvard-Smithsonian Center for Astrophysics

Title: Resolving cluster evolution

Abstract: We propose to use the high-multiplex of GMOS-S in N+S mode to spectroscopically confirm 50 new cluster members within the FoV of deep GeMS-AO observations of a massive z 1 galaxy cluster. The cluster, identified from the early South Pole Telescope sample, is currently the only confirmed z>1 cluster with accessible GeMS guide-stars (of 40 known clusters). We have committed 3 nights of guaranteed time to GeMS AO imaging of the inner Mpc of this system. This will provide HST-resolution morphological properties for cluster members derived directly from their rest-frame optical stellar continuum, and hence less susceptible to the bias inherent in the rest-frame UV due to the presence of star-formation. The unique combination of GMOS spectroscopy and GeMS imaging will permit detailed morphological studies of secure cluster members at this redshift where important evolutionary questions persist. This will test the relative importance of wet vs. dry merging, or major-mergers vs. inside-out growth, in one of the most massive, high-redshift clusters known.


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