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LoCuSS: The Sunyaev–Zel'dovich Effect and Weak-lensing Mass Scaling Relation

Marrone, Daniel P. and Smith, Graham P. and Okabe, Nobuhiro and Bonamente, Massimiliano and Carlstrom, John E. and Culverhouse, Thomas L. and Gralla, Megan and Greer, Christopher H. and Hasler, Nicole and Hawkins, David and Hennessy, Ryan and Joy, Marshall and Lamb, James W. and Leitch, Erik M. and Martino, Rosella and Mazzotta, Pasquale and Miller, Amber and Mroczkowski, Tony and Muchovej, Stephen and Plagge, Thomas and Pryke, Clem and Sanderson, Alastair J. R. and Takada, Masahiro and Woody, David and Zhang, Yuying (2012) LoCuSS: The Sunyaev–Zel'dovich Effect and Weak-lensing Mass Scaling Relation. Astrophysical Journal, 754 (2). Art. No. 119. ISSN 0004-637X.

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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 Δ = 500, 1000, and 2500 ρ_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.

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Mroczkowski, Tony0000-0003-3816-5372
Additional Information:© 2012 American Astronomical Society. Received 2011 July 24; accepted 2012 May 18; published 2012 July 17. We thank Daisuke Nagai, Laurie Shaw, Neelima Sehgal, and Rebecca Stanek for providing their simulated scaling relations. We are grateful to Gus Evrard, Andrey Kravtsov, Matthew Becker, and Bradford Benson for comments that have improved this manuscript. Support for CARMA construction was derived from the Gordon and Betty Moore Foundation, the Kenneth T. and Eileen L. Norris Foundation, the James S. McDonnell Foundation, the Associates of the California Institute of Technology, the University of Chicago, the states of California, Illinois, and Maryland, and the National Science Foundation. Ongoing CARMA development and operations are supported by the National Science Foundation under a cooperative agreement, including grant AST-0838187 at the University of Chicago, and by the CARMA partner universities. Partial support is provided by NSF Physics Frontier Center Grant PHY-0114422 to the Kavli Institute of Cosmological Physics. D. P. M. was supported for part of this work by NASA through Hubble Fellowship Grant HST-HF-51259.01. He acknowledges the Kavli Institute for Theoretical Physics for its hospitality during part of this research, supported by NSF Grant PHY-0551164. G. P. S. acknowledges support from the Royal Society. Support for T. M. was provided by NASA through the Einstein Fellowship Program, grant PF0-110077. N. O. was partially supported by a Grant-in-Aid (0740099), and this work was supported by the programs “Weaving Science Web beyond Particle-Matter Hierarchy” in Tohoku University and “Probing the Dark Energy through an Extremely Wide and Deep Survey with Subaru Telescope” (18072001), all of which are funded by the Ministry of Education, Culture, Sports, Science, and Technology of Japan.Y.Y.Z. acknowledges support from the German BMBF through the Verbundforschung under grant No. 50 OR 1005. Facility: CARMA
Funding AgencyGrant Number
NSF Physics Frontier Center grantPHY-0114422
NASA Hubble Fellowship grantHST-HF-51259.01
NASA Einstein Fellowship ProgramPF0-110077
Ministry of Education, Culture, Sports, Science, and Technology of Japan18072001
German BMBF Verbundforschung50 OR 1005
Subject Keywords:cosmology: observations; galaxies: clusters: intracluster medium; gravitational lensing: weak
Record Number:CaltechAUTHORS:20120831-101945253
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Official Citation:LoCuSS: The Sunyaev–Zel'dovich Effect and Weak-lensing Mass Scaling Relation Daniel P. Marrone et al. 2012 ApJ 754 119
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33758
Deposited By: Jason Perez
Deposited On:31 Aug 2012 19:48
Last Modified:27 Mar 2019 22:06

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