NOAO >   Observing Info >   Approved Programs >   2014A-0191

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Proposal Information for 2014A-0191


PI: Hendrik Hildebrandt, University of Bonn, hendrik@astro.uni-bonn.de
Address: Argelander-Institute for Astronomy, Auf dem Huegel 71, Bonn 53121, Germany

CoI: Gillian Wilson, University of California, Riverside
CoI: Adam Muzzin, Leiden University
CoI: Thomas Erben, Bonn University
CoI: Henk Hoestra, Leiden University
CoI: Paul Hsieh, Academia Sinica, Taipei
CoI: Konrad Kuijken, Leiden University
CoI: Jason Surace, California Institute of Technology
CoI: Ludovic van Waerbeke, University of British Columbia
CoI: Howard Yee, University of Toronto
CoI: Alexandru Tudorica, University of Bonn

Title: Lensing Magnification: A novel method to calibrate the mass-richness relation of galaxy clusters at high redshift

Abstract: We propose to calibrate the mass-richness relation of galaxy clusters at redshift z > 1 with an innovative technique based on weak gravitational lensing magnification. Optical imaging data from DECam in the ugr-bands (together with existing griz-band data) will be used to select Lyman-break galaxies. We will measure their lensing- induced angular cross-correlation function to z > 1 clusters found in the SpARCS survey. Our technique, which we have tested extensively, will enable us to measure the average mass of these high- z clusters with an error of ~ 25% which will normalize the mass- richness relation at z > 1. Such a normalization will represent a valuable input for cosmological studies employing the galaxy cluster mass function. Studies of cluster formation and evolution will benefit from such a mass estimate in this crucial cluster formation epoch. We anticipate that this technique will become very important for future large imaging surveys like DES, PanSTARRS, LSST, and Euclid since there is no other method that yields average cluster masses at z > 1 for large samples of hundreds or thousands of high-redshift clusters.


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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