4.7 Article

LoCuSS: THE SUNYAEV-ZEL'DOVICH EFFECT AND WEAK-LENSING MASS SCALING RELATION

期刊

ASTROPHYSICAL JOURNAL
卷 754, 期 2, 页码 -

出版社

IOP Publishing Ltd
DOI: 10.1088/0004-637X/754/2/119

关键词

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

资金

  1. Gordon and Betty Moore Foundation
  2. Kenneth T. and Eileen L. Norris Foundation
  3. James S. McDonnell Foundation
  4. Associates of the California Institute of Technology
  5. University of Chicago
  6. states of California, Illinois, and Maryland
  7. National Science Foundation [AST-0838187, PHY-0114422, PHY-0551164]
  8. NASA [HST-HF-51259.01, PF0-110077]
  9. Royal Society
  10. Tohoku University
  11. Ministry of Education, Culture, Sports, Science, and Technology of Japan
  12. German BMBF through the Verbundforschung [50 OR 1005]
  13. [0740099]
  14. [18072001]
  15. Direct For Mathematical & Physical Scien
  16. Division Of Astronomical Sciences [1140019, 0838187] Funding Source: National Science Foundation
  17. Direct For Mathematical & Physical Scien
  18. Division Of Physics [1125897] Funding Source: National Science Foundation
  19. Grants-in-Aid for Scientific Research [23340061] Funding Source: KAKEN
  20. STFC [ST/J003077/1, ST/H001417/1, PP/E003486/1] Funding Source: UKRI

向作者/读者索取更多资源

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 similar or equal to 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.

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