NOAO >   Observing Info >   Approved Programs >   2013A-0369

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Proposal Information for 2013A-0369


PI: Rose Finn, Siena College, rfinn@siena.edu
Address: Physics Department, 515 Loudon Rd, Loudonville, NY 12211, USA

CoI: Janice C. Lee, Space Telescope Science Institute
CoI: Ken Rines, Western Washington University
CoI: Daniel Dale, University of Wyoming
CoI: Chun Ly, Space Telescope Science Institute
CoI: Greg Rudnick, University of Kansas
CoI: Vandana Desai, IPAC
CoI: Dennis Zaritsky, University of Arizona

Title: NEWFIRM H-alpha Survey of z=0.8 Galaxy Clusters

Abstract: We request 4 nights of 4.0-m time to complete narrow-band imaging centered on the observed wavelength of \ha for three z=0.8 galaxy clusters using NEWFIRM and a custom narrow-band filter. The narrow-band filter is designed to sample a region of the IR window that is relatively free from OH emission; we are thus able to detect low star- formation rates (SFRs) (2 \smy) in a reasonable amount of observing time. NEWFIRM's large field-of-view allows simultaneous imaging of the cluster center and surrounding infall region, an area where galaxy transformation is likely taking place. These data, in conjunction with a companion survey of z=0.8 field galaxies led by CoI Lee, will provide a census of SFRs over the full range in galactic environments at an epoch when the Universe was half its current age. In contrast, most field surveys of intermediate-redshift galaxies deliberately avoid clusters and thus fail to survey the densest galactic environments. The z=0.8 epoch probes a cosmologically interesting time in cluster evolution, when clusters were only half their present mass and accretion rates were higher. This study is thus uniquely suited to determine whether clusters speed a galaxy's evolution from star-forming to quiescent.


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