NOAO >   Observing Info >   Approved Programs >   2008B-0341

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Proposal Information for 2008B-0341


PI: Eiichi Egami, University of Arizona, eegami@as.arizona.edu
Address: Steward Observatory, 933 N. Cherry Ave., 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: Noboru Okabe, Tohoku University, Japan
CoI: Keiichi Umetsu, Academica Sinca, 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: The Local Cluster Substructure Survey (LoCuSS): I. Joint KPNO/Spitzer/Herschel/Subaru Study of the Star Formation & Assembly Histories of Massive 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 32 LoCuSS clusters for which we have Subaru/Suprime-CAM weak lensing mass maps, panoramic Spitzer/MIPS 24(micron) images, and approved GALEX FUV/NUV and Herschel/PACS 100 and 160(micron) images. 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. (We are also submitting a companion CTIO- 4m/ISPI proposal to observe the central 10'\times10' area of 12 southern LoCuSS clusters, expanding the data set to explore K-band light as a probe of cluster mass and substructure.)


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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