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Weak-lensing Mass Measurements of Five Galaxy Clusters in the South Pole Telescope Survey Using Magellan/Megacam

High, F. W. and Lueker, M. and Padin, S. and Shirokoff, E. and Vieira, J. D. (2012) Weak-lensing Mass Measurements of Five Galaxy Clusters in the South Pole Telescope Survey Using Magellan/Megacam. Astrophysical Journal, 758 (1). Art. No. 68. ISSN 0004-637X.

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We use weak gravitational lensing to measure the masses of five galaxy clusters selected from the South Pole Telescope (SPT) survey, with the primary goal of comparing these with the SPT Sunyaev-Zel'dovich (SZ) and X-ray-based mass estimates. The clusters span redshifts 0.28 < z < 0.43 and have masses M_(500) > 2 × 10^(14) h^(–1) M_☉, and three of the five clusters were discovered by the SPT survey. We observed the clusters in the g'r'i' passbands with the Megacam imager on the Magellan Clay 6.5 m telescope. We measure a mean ratio of weak-lensing (WL) aperture masses to inferred aperture masses from the SZ data, both within an aperture of R_(500,SZ) derived from the SZ mass, of 1.04 ± 0.18. We measure a mean ratio of spherical WL masses evaluated at R_(500,SZ) to spherical SZ masses of 1.07 ± 0.18, and a mean ratio of spherical WL masses evaluated at R_(500,WL) to spherical SZ masses of 1.10 ± 0.24. We explore potential sources of systematic error in the mass comparisons and conclude that all are subdominant to the statistical uncertainty, with dominant terms being cluster concentration uncertainty and N-body simulation calibration bias. Expanding the sample of SPT clusters with WL observations has the potential to significantly improve the SPT cluster mass calibration and the resulting cosmological constraints from the SPT cluster survey. These are the first WL detections using Megacam on the Magellan Clay telescope.

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Additional Information:© 2012 American Astronomical Society. Received 2012 May 11; accepted 2012 August 26; published 2012 September 26. We thank M. Holman for trading Megacam observing time for a proof-of-concept study, which enabled the first ever detection of weak gravitational shear using the Clay-Megacam system (SPT-CL J0516-5430). We extend thanks to P. Protopapas for observing assistance, as well as the entire staff of Las Campanas Observatory and the Megacam instrument scientists. We gratefully acknowledge Risa Wechsler, Michael Busha, and Matt Becker for providing us simulated shear catalogs. The simulation used to produce the catalogs is one of the Carmen simulations, a 1 Gpc simulation run by M. Busha as part of the Las Damas project. We also thank D. Johnston, E. Rozo, J. Dietrich, J. Rhodes, D. Clowe, P. Melchior, P. Shechter, and S. Dodelson for useful discussions. We gratefully acknowledge the anonymous referee for providing useful comments that improved this manuscript. The South Pole Telescope program is supported by the National Science Foundation through grant ANT-0638937. Partial support is also provided by the NSF Physics Frontier Center grant PHY-0114422 to the Kavli Institute of Cosmological Physics at the University of Chicago, the Kavli Foundation, and the Gordon and Betty Moore Foundation. H.H. acknowledges support from Marie Curie IRG grant 230924 and the Netherlands Organisation for Scientific Research (NWO) grant No.639.042.814. The Munich group acknowledges support from the Excellence Cluster Universe and the DFG research program TR33 The Dark Universe. Galaxy cluster research at Harvard is supported by NSF grant AST-1009012, and research at SAO is supported in part by NSF grants AST-1009649 and MRI-0723073. The McGill group acknowledges funding from the National Sciences and Engineering Research Council of Canada, Canada Research Chairs program, and the Canadian Institute for Advanced Research. R.J.F. is supported by a Clay fellowship. This paper used data products produced by the OIR Telescope Data Center, supported by the Smithsonian Astrophysical Observatory. This work is based in part on data products produced at the Canadian Astronomy Data Centre and Terapix as part of the Canada–France–Hawaii Telescope Legacy Survey, a collaborative project of the National Research Council of Canada and the French Centre National de la Recherche Scientifique. Facilities: Magellan: Baade (IMACS), Magellan: Clay (Megacam)
Funding AgencyGrant Number
NSF Physics Frontier CenterPHY-0114422
Kavli FoundationUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Marie Curie IRG grant230924
Netherlands Organization for Scientific Research (NWO)639.042.814
Excellence Cluster UniverseUNSPECIFIED
DFG research program TR33 Dark UniverseUNSPECIFIED
National Sciences and Engineering Research Council of CanadaUNSPECIFIED
Clay FellowshipUNSPECIFIED
Smithsonian Astrophysical ObservatoryUNSPECIFIED
Canadian Institute for Advanced Research (CIAR)UNSPECIFIED
Subject Keywords:cosmology: observations; galaxies: clusters: individual
Issue or Number:1
Record Number:CaltechAUTHORS:20121109-104005537
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Official Citation:Weak-lensing Mass Measurements of Five Galaxy Clusters in the South Pole Telescope Survey Using Magellan/Megacam F. W. High et al. 2012 ApJ 758 68
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35386
Deposited By: Ruth Sustaita
Deposited On:09 Nov 2012 21:18
Last Modified:03 Oct 2019 04:27

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