TY - JOUR
T1 - LoCuSS
T2 - The Sunyaev-Zel'dovich effect and weak-lensing mass scaling relation
AU - Marrone, Daniel P.
AU - Smith, Graham P.
AU - Okabe, Nobuhiro
AU - Bonamente, Massimiliano
AU - Carlstrom, John E.
AU - Culverhouse, Thomas L.
AU - Gralla, Megan
AU - Greer, Christopher H.
AU - Hasler, Nicole
AU - Hawkins, David
AU - Hennessy, Ryan
AU - Joy, Marshall
AU - Lamb, James W.
AU - Leitch, Erik M.
AU - Martino, Rossella
AU - Mazzotta, Pasquale
AU - Miller, Amber
AU - Mroczkowski, Tony
AU - Muchovej, Stephen
AU - Plagge, Thomas
AU - Pryke, Clem
AU - Sanderson, Alastair J.R.
AU - Takada, Masahiro
AU - Woody, David
AU - Zhang, Yuying
PY - 2012/8/1
Y1 - 2012/8/1
N2 - 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.
AB - 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.
KW - cosmology: observations
KW - galaxies: clusters: intracluster medium
KW - gravitational lensing: weak
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U2 - 10.1088/0004-637X/754/2/119
DO - 10.1088/0004-637X/754/2/119
M3 - Article
AN - SCOPUS:84864245561
SN - 0004-637X
VL - 754
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 119
ER -