NOAO >   Observing Info >   Approved Programs >   2010B-0222

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Proposal Information for 2010B-0222


PI: Felipe Menanteau, Rutgers University, felipe@physics.rutgers.edu
Address: Physics Department, 136 Frelinghuysen Rd, Piscataway, NJ 08854, USA

CoI: John P. Hughes, Rutgers University
CoI: Felipe Barrientos, P. Univ. Catolica de Chile
CoI: Leopoldo Infante, P. Univ. Catolica de Chile
CoI: Toby Marriage, Princeton University
CoI: Jorge Gonzalez, P. Univ. Catolica de Chile
CoI: Jean-Baptiste Juin, P. Univ. Catolica de Chile
CoI: Yen-Ting Lin, IPMU, Japan
CoI: Matt Hilton, University of KwaZulu-Natal, South Africa
CoI: Kavilan Moodley, University of KwaZulu-Natal, South Africa

Title: Mass Calibration and Gas Physics of a Complete Sample of ACT SZE- Selected Galaxy Clusters

Abstract: We propose to use Gemini/GMOS to obtain spectroscopic redshifts and dynamical mass estimates for the first sample of high-redshift galaxy clusters detected by the Atacama Cosmology Telescope (ACT) via the Sunyaev-Zeldovich effect (SZE). The proposed GMOS observations of 14 massive newly-discovered SZE-clusters will provide a precision calibration of the SZE signal (Y) vs. mass correlation at redshifts out to 1. With this calibration, our existing SZE-selected cluster sample should enable a better measurement of \sigma_8 and \Omega_M. The observations will also allow us to study the evolution, star formation rates and stellar populations in the most massive clusters over 0.3 < z <1. The proposed observations represents the first complete, SZE- selected sample of massive clusters over all redshifts within a cosmologically-significant survey volume. The overall sample (of ~ 50 clusters) will be used to calibrate the Y-mass scaling relation, which in turn allows us to constrain the dark energy via cluster mass function, in conjunction with a cluster correlation function analysis. This sample will also allows us to start studying the cluster gas physics responsible for the the SZE signature.


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 >   2010B-0222

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