NOAO >   Observing Info >   Approved Programs >   2012A-0308

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Proposal Information for 2012A-0308


PI: Saul Perlmutter, Lawrence Berkeley National Laboratory, saul@lbl.gov
Address: Lawrence Berkeley National Laboratory, One Cyclotron Rd, MS50R5032, Berkeley, CA, 94720, USA

CoI: Chris Lidman, Anglo-Australian Observatory
CoI: Isobel Hook, University of Oxford
CoI: Eli Rykoff, Lawrence Berkeley National Laboratory
CoI: Tony Spadafora, Lawrence Berkeley National Laboratory
CoI: Nao Suzuki, Lawrence Berkeley National Laboratory
CoI: Joshua Meyers, University of California, Berkeley
CoI: David Rubin, University of California, Berkeley
CoI: Kyle Barbary, University of California, Berkeley
CoI: Greg Aldering, Lawrence Berkeley National Laboratory
CoI: Jakob Nordin, Lawrence Berkeley National Laboratory

Title: Galaxy Cluster Supernovae at z 0.5: Dissecting the Hubble Diagram

Abstract: Large new surveys using WFC3 and ACS on HST will enable the construction of a Type Ia supernova Hubble diagram free from the deleterious and uncertain effects of host-galaxy dust absorption. We propose Gemini-N Target-of-Opportunity long-slit spectroscopy to measure SN features and characterize host environments in conjunction with an approved HST cluster SN search at z 0.5. When combined with high-redshift cluster SNe, we will for the first time be able to create a dust-free Hubble diagram. Furthermore, by comparing elliptical and non-elliptical hosted subsamples we will quantify the cosmology measurement systematics present in existing mixed-host SN samples. In addition to targeting cluster-hosted SNe, we will have the opportunity to observe highly magnified background SNe Ia that can be used as independent probes of cosmology as well as testing lensing mass maps of the foreground clusters.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2012A-0308

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