NOAO >   Observing Info >   Approved Programs >   2011B-0137

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Proposal Information for 2011B-0137


PI: Felipe Menanteau, Rutgers University, felipe@physics.rutgers.edu
Address: Department of Physics and Astronomy, 136 Frelinghuysen Rd, Piscataway, NJ 08855-0849, USA

CoI: L. Felipe Barrientos, Pontificia Universidad Catolica de Chile
CoI: John P. Hughes, Rutgers University
CoI: Leopoldo Infante, Pontificia Universidad Catolica de Chile
CoI: Matt Hilton, University of Nottingham
CoI: Cristobal Sifon, Pontificia Universidad Catolica de Chile
CoI: Jorge Gonzalez, Pontificia Universidad Catolica de Chile
CoI: Kavilan Modley, University of KwaZulu-Natal, South Africa
CoI: Yen-Ting Lin, IPMU, Japan

Title: Mass Calibration of a Sample of ACT SZE-Selected Galaxy Clusters

Abstract: We propose to continue our Gemini/GMOS program to obtain spectroscopic redshifts and dynamical mass estimates for a large redshift-independent sample of galaxy clusters detected by the Atacama Cosmology Telescope (ACT) via the Sunyaev-Zeldovich effect (SZE) for multiple high-impact science goals. The proposed GMOS observations of 12 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 a 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.


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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