NOAO >   Observing Info >   Approved Programs >   2013A-0541

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Proposal Information for 2013A-0541


PI: Inger Jorgensen, Gemini Observatory, inger@gemini.edu
Address: Gemini Observatory, 670 N. Aohoku Place, Hilo, HI 96720, USA

CoI: Marcel Bergmann, NOAO
CoI: Richardo Schiavon, Gemini Observatory
CoI: Sune Toft, Dark Cosmology Center, Copenhagen
CoI: Andrew Zirm, Dark Cosmology Center, Copenhagen
CoI: Ruth Gruetzbauch, University of Lisbon, Portugal
CoI: Kristin Chiboucas, Gemini Observatory

Title: RDCS J0848+4453: Stellar populations in a z=1.27 galaxy cluster

Abstract: We propose to obtain deep optical spectroscopy of galaxies in the rich cluster RDCSJ0848+4453 (z=1.27). Our proposal is part of a larger project aimed at constraining models for galaxy evolution in dense environments from observations of stellar populations in rich z=1.2-2 galaxy clusters. The main objective is to establish the star formation (SF) history over this epoch during which large changes in SF rates and galaxy structure are expected to take place in cluster galaxies. Together with our previous shallower GMOS-N spectroscopy of RDCSJ0848+4453 the observations proposed here will reach S/N=20 for galaxies 2.7 mag fainter than the brightest cluster galaxy. The spectra will be used to determine SF rates, ages and metallicities as well as measure the velocity dispersions. Combining the spectroscopy with available HST/ACS imaging, we will test models for evolution of the Fundamental Plane and of galaxy size. The analysis will also utilize data from the Gemini/HST Galaxy Cluster Project, which covers rich clusters at z=0.2-1.0. The new E2V DD CCDs in GMOS make possible this unprecedented probe of distant cluster galaxies, as no prior stellar population studies based on high S/N spectra exist for clusters at z>1.


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