NOAO >   Observing Info >   Approved Programs >   2008A-0344

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Proposal Information for 2008A-0344


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

CoI: Graham P. Smith, University of Birmingham, UK
CoI: Chris P. Haines, University of Birmingham, UK
CoI: Masahiro Takada, Tohoku University, Japan
CoI: Nobuhiro Okabe, Tohoku University, Japan
CoI: Keiichi Umetsu, Academica Sinica, Taiwan
CoI: Richard S. Ellis, California Institute of Technology
CoI: Johan Richard, California Institute of Technology
CoI: Jean-Paul Kneib, Laboratoire d'Astrophysique de Marseilles
CoI: John Carlstrom, University of Chicago

Title: LoCuSS: Joint KPNO/Spitzer/Subaru Study of the Star Formation and Assembly Histories of Massive Galaxy Clusters

Abstract: LoCuSS (\bf Local \bf Cl\bf uster \bf Substructure \bf Survey) is a systematic multi-wavelength survey of 100 X-ray luminous galaxy clusters at z=0.2 to study the impact of the hierarchical assembly history of the clusters on the star formation histories of the cluster galaxies. Importantly, we are using gravitational lensing to measure cluster mass and substructure - we are therefore able to test the assumptions necessary in other studies to connect baryonic observables with cluster mass. Here we propose a comprehensive near-IR study of the stellar mass content of a sub-set of 31 LoCuSS clusters for which we have Subaru/Suprime-CAM weak lensing mass maps available, and have been approved Spitzer/MIPS obervations at 24(micron) in 2008. The proposed J/K-band observations will enable us to measure the stellar mass content of the clusters out to the virial radius, determine whether 24(micron) Spitzer sources are cluster members, and estimate the stellar mass of the 24(micron) cluster population.


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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