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Date and Time of the Query: 2019-04-18 T15:37:34 PDT
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For refcode 2012ApJ...754..119M:
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2012ApJ...754..119M LoCuSS: The Sunyaev--Zel'dovich Effect and Weak-lensing Mass Scaling Relation Marrone, Daniel P.; Smith, Graham P.; Okabe, Nobuhiro; Bonamente, Massimiliano; Carlstrom, John E.; Culverhouse, Thomas L.; Gralla, Megan; Greer, Christopher H.; Hasler, Nicole; Hawkins, David; Hennessy, Ryan; Joy, Marshall; Lamb, James W.; Leitch, Erik M.; Martino, Rossella; Mazzotta, Pasquale; Miller, Amber; Mroczkowski, Tony; Muchovej, Stephen; Plagge, Thomas; Pryke, Clem; Sanderson, Alastair J. R.; Takada, Masahiro; Woody, David; Zhang, Yuying Abstract. We present the first weak-lensing-based scaling relation between galaxy cluster mass, M_WL_, and integrated Compton parameter Y_sph_. Observations of 18 galaxy clusters at z ~= 0.2 were obtained with the Subaru 8.2 m telescope and the Sunyaev-Zel'dovich Array. The M_WL_-Y_sph_ scaling relations, measured at Delta = 500, 1000, and 2500 {rho}_ c_, are consistent in slope and normalization with previous results derived under the assumption of hydrostatic equilibrium (HSE). We find an intrinsic scatter in M_WL_ at fixed Y_sph_ of 20%, larger than both previous measurements of M_HSE_-Y_sph_ scatter as well as the scatter in true mass at fixed Y_sph_ found in simulations. Moreover, the scatter in our lensing-based scaling relations is morphology dependent, with 30%-40% larger M_WL_ for undisturbed compared to disturbed clusters at the same Y_sph_ at r_ 500_. Further examination suggests that the segregation may be explained by the inability of our spherical lens models to faithfully describe the three-dimensional structure of the clusters, in particular, the structure along the line of sight. We find that the ellipticity of the brightest cluster galaxy, a proxy for halo orientation, correlates well with the offset in mass from the mean scaling relation, which supports this picture. This provides empirical evidence that line-of-sight projection effects are an important systematic uncertainty in lensing-based scaling relations. Key words: cosmology: observations, galaxies: clusters: intracluster medium, gravitational lensing: weak
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