Mathematics – Logic
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..232b&link_type=abstract
NOAO Proposal ID #2008B-0232
Mathematics
Logic
Scientific paper
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.
Allen Mark
Allen Steve
Applegate Douglas
Burchat Patrica
Burke David
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