WEAK-LENSING MASS MEASUREMENTS OF FIVE GALAXY CLUSTERS IN THE SOUTH POLE TELESCOPE SURVEY USING MAGELLAN/MEGACAM

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 an...

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Bibliographic Details
Published in:The Astrophysical journal 2012-10, Vol.758 (1), p.1-22
Main Authors: High, F W, Hoekstra, H, LEETHOCHAWALIT, N, de Haan, T, Abramson, L, Aird, K A, Armstrong, R, Ashby, M L N, Bautz, M, Bayliss, M
Format: Article
Language:English
Subjects:
APERTURES
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CALIBRATION
Clay (material)
Clusters
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
COSMOLOGY
Galactic clusters
GALAXY CLUSTERS
MASS
POTENTIALS
RED SHIFT
South Pole
SPHERICAL CONFIGURATION
TELESCOPES
Uncertainty
X RADIATION
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Summary: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 sub(500) > 2 x 10 super(14) h super(-1) M sub([middot in circle]), 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 sub(500,SZ) derived from the SZ mass, of 1.04 + or - 0.18. We measure a mean ratio of spherical WL masses evaluated at R sub(500,SZ) to spherical SZ masses of 1.07 + or - 0.18, and a mean ratio of spherical WL masses evaluated at R sub(500,WL) to spherical SZ masses of 1.10 + or - 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.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/758/1/68