LoCuSS: The Sunyaev-Zel'dovich effect and weak-lensing mass scaling relation

Daniel P. Marrone, Graham P. Smith, Nobuhiro Okabe, Massimiliano Bonamente, John E. Carlstrom, Thomas L. Culverhouse, Megan Gralla, Christopher H. Greer, Nicole Hasler, David Hawkins, Ryan Hennessy, Marshall Joy, James W. Lamb, Erik M. Leitch, Rossella Martino, Pasquale Mazzotta, Amber Miller, Tony Mroczkowski, Stephen Muchovej, Thomas PlaggeClem Pryke, Alastair J.R. Sanderson, Masahiro Takada, David Woody, Yuying Zhang

Research output: Contribution to journalArticlepeer-review

80 Scopus citations


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 8.2m telescope and the Sunyaev-Zel'dovich Array. The M WL-Y sph scaling relations, measured at Δ = 500, 1000, and 2500 ρc, 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.

Original languageEnglish (US)
Article number119
JournalAstrophysical Journal
Issue number2
StatePublished - Aug 1 2012


  • cosmology: observations
  • galaxies: clusters: intracluster medium
  • gravitational lensing: weak

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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