NOAO >   Observing Info >   Approved Programs >   2007A-0428

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Proposal Information for 2007A-0428


PI: Eiichi Egami, Steward Observatory, University of Arizona, eegami@as.arizona.edu
Address: 933 N. Cherry Avenue, Tucson, AZ 85721, USA

CoI: Phil Marshall, U.C. Santa Barbara
CoI: Pasquale Mazzotta, CfA, Harvard
CoI: August Evrard, University of Michigan
CoI: John Carlstrom, University of Chicago
CoI: Graham P. Smith, University of Birmingham, UK
CoI: Jean-Paul Kneib, Laboratoire d'Astrophysique de Marseille, France
CoI: Alexis Finoguenov, MPE, Garching, Germany
CoI: Toshifumi Futamase, Tohoku University, Japan
CoI: James Taylor, University of Waterloo, Canada

Title: The Local Cluster Substructure Survey (LoCuSS): Exploring K-band light as a probe of cluster mass and substructure

Abstract: LoCuSS is a systematic multi-wavelength survey of 100 X-ray luminous galaxy clusters at z~eq0.2. A key goal is to construct robust cluster mass-observable scaling relations for cosmological and astrophysical applications. For example the mass-temperature and mass- SZE relations are pivotal to cluster-based dark energy measurements. We are using gravitational lensing to measure cluster mass and thus to test explicitly assumptions about how baryons trace the total cluster mass. Here, we propose to obtain NIR imaging of LoCuSS clusters to probe their evolved stellar populations. These data will allow a detailed investigation of how the the integrated cluster K-band luminosity and substructure within K-band light maps correlate with the total cluster mass and substructure obtained from lensing. In addition to exploring the mass-L_K scaling relation for possible cosmological application, we will calibrate NIR data as an inexpensive probe of cluster mass and substructure to aide the interpretation of ongoing and future surveys for high-redshift clusters.


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



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