期刊
ASTROPHYSICAL JOURNAL
卷 758, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0004-637X/758/1/68
关键词
cosmology: observations; galaxies: clusters: individual
资金
- National Science Foundation [ANT-0638937]
- NSF Physics Frontier Center [PHY-0114422]
- Kavli Foundation
- Gordon and Betty Moore Foundation
- Marie Curie IRG [230924]
- Netherlands Organisation for Scientific Research (NWO) [639.042.814]
- Excellence Cluster Universe
- DFG research program [TR33]
- NSF [AST-1009012, AST-1009649, MRI-0723073]
- National Sciences and Engineering Research Council of Canada
- Canada Research Chairs program
- Canadian Institute for Advanced Research
- Clay fellowship
- Smithsonian Astrophysical Observatory
- Direct For Mathematical & Physical Scien
- Division Of Physics [1125897] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1009012, 1009649] Funding Source: National Science Foundation
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 x 10(14) h(-1)M(circle dot), 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,R-SZ derived from the SZ mass, of 1.04 +/- 0.18. We measure a mean ratio of spherical WL masses evaluated at R-500,R-SZ to spherical SZ masses of 1.07 +/- 0.18, and a mean ratio of spherical WL masses evaluated at R-500,R-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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