NOAO >   Observing Info >   Approved Programs >   2009A-0136

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Proposal Information for 2009A-0136


PI: Patrick Kelly, Stanford University, pkelly3@stanford.edu
Address: Physics Department, 382 Via Pueblo Mall, Stanford, CA 94305, USA

CoI: David Burke, Kavli Institute for Particle Astrophysics and Cosmology
CoI: Mark Allen, Stanford University
CoI: Steve Allen, Stanford University
CoI: Douglas Applegate, Stanford University
CoI: Patricia Burchat, Stanford University
CoI: Anja von der Linden, Stanford University

Title: Photometric Calibration of Subaru Massive Cluster Survey Fields

Abstract: Recent x-ray studies of galaxy clusters have produced strong evidence for Dark Energy and tight constraints on cosmological parameters. The dominant source of systematic uncertainties associated with these methods is in the cluster masses deduced from x-ray luminosities. The assumption of hydrostatic equilibrium that enables a mass estimate has been shown not to be applicable to many of the most massive clusters. To characterize systematic uncertainty and improve the calibration of x-ray masses, we have assembled optical images of a sample of massive clusters for which x-ray data is available and are using weak lensing to measure the clusters' total masses. Our data sample includes multi-band Subaru imaging of clusters in the MAssive Cluster Survey (MACS) with complementary Chandra and Hubble Space Telescope observations. Photometric calibration of the Subaru images has been partially completed with Subaru itself and with available Sloan Digital Sky Survey (SDSS) measurements, but a number of the Subaru fields remain uncalibrated. We propose to complete the photometric calibration of these fields using the 2.1m-telescope at Kitt Peak.


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 >   2009A-0136

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