NOAO >   Observing Info >   Approved Programs >   2008B-0232

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Proposal Information for 2008B-0232


PI: David Burke, SLAC, daveb@stanford.edu
Address: Kavli Institute for Particle Astrophysics and Cosmology, PO Box 20450, Stanford, CA 94309, USA

CoI: Mark Allen, Stanford University
CoI: Steve Allen, Stanford University
CoI: Douglas Applegate, Stanford University
CoI: Patrica Burchat, Stanford University
CoI: Patrick Kelly, 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 in 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 Subura 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 calibrate the photometry in 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 >   2008B-0232

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