Marrone, Daniel P. and Smith, Graham P. and Richard, Johan and Joy, Marshall and Bonamente, Massimiliano and Hasler, Nicole and Hamilton-Morris, Victoria and Kneib, Jean-Paul and Culverhouse, Thomas and Carlstrom, John E. and Greer, Christopher and Hawkins, David and Hennessy, Ryan and Lamb, James W. and Leitch, Erik M. and Loh, Michael and Miller, Amber and Mroczkowski, Tony and Muchovej, Stephen and Pryke, Clem and Sharp, Matthew K. and Woody, David (2009) LoCuSS: A Comparison of Sunyaev-Zel'dovich Effect and Gravitational-Lensing Measurements of Galaxy Clusters. Astrophysical Journal, 701 (2). L114-L118. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20090831-152321083
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We present the first measurement of the relationship between the Sunyaev-Zel'dovich effect (SZE) signal and the mass of galaxy clusters that uses gravitational lensing to measure cluster mass, based on 14 X-ray luminous clusters at z ≃ 0.2 from the Local Cluster Substructure Survey. We measure the integrated Compton y-parameter, Y, and total projected mass of the clusters (M_(GL)) within a projected clustercentric radius of 350 kpc, corresponding to mean overdensities of 4000-8000 relative to the critical density. We find self-similar scaling between M GL and Y, with a scatter in mass at fixed Y of 32%. This scatter exceeds that predicted from numerical cluster simulations, however, it is smaller than comparable measurements of the scatter in mass at fixed T_(X). We also find no evidence of segregation in Y between disturbed and undisturbed clusters, as had been seen with T_(X) on the same physical scales. We compare our scaling relation to the Bonamente et al. relation based on mass measurements that assume hydrostatic equilibrium, finding no evidence for a hydrostatic mass bias in cluster cores (M_(GL) = 0.98 ± 0.13 M_(HSE)), consistent with both predictions from numerical simulations and lensing/X-ray-based measurements of mass-observable scaling relations at larger radii. Overall our results suggest that the SZE may be less sensitive than X-ray observations to the details of cluster physics in cluster cores.
|Additional Information:||© 2009 American Astronomical Society. Print publication: Issue 2 (2009 August 20); received 2009 April 7; accepted for publication 2009 July 6; published 2009 August 10. We thank our colleagues in the LoCuSS collaborations for much support, encouragement and help. G.P.S. acknowledges support from the Royal Society and STFC, and thanks the Kavli Institute of Cosmological Physics at the University of Chicago for their hospitality whilstworking on this Letter. G.P.S. thanks Alain Blanchard for helpful comments. We gratefully acknowledge the James S. McDonnell Foundation, the National Science Foundation, and the University of Chicago for funding to construct the SZA. The operation of the SZA is supported by NSF Division of Astronomical Sciences through grant AST-0604982. Partial support is provided by NSF Physics Frontier Center grant PHY-0114422 to the Kavli Institute of Cosmological Physics at the University of Chicago, and by NSF grants AST-0507545 and AST-05-07161 to Columbia University. Facilities: SZA, HST (WFPC2)|
|Subject Keywords:||cosmology: observations; galaxies: clusters: general; gravitational lensing|
|Official Citation:||LoCuSS: A Comparison of Sunyaev-Zel'dovich Effect and Gravitational-Lensing Measurements of Galaxy Clusters Daniel P. Marrone, Graham P. Smith, Johan Richard, Marshall Joy, Massimiliano Bonamente, Nicole Hasler, Victoria Hamilton-Morris, Jean-Paul Kneib, Thomas Culverhouse, John E. Carlstrom, Christopher Greer, David Hawkins, Ryan Hennessy, James W. Lamb, Erik M. Leitch, Michael Loh, Amber Miller, Tony Mroczkowski, Stephen Muchovej, Clem Pryke, Matthew K. Sharp, and David Woody 2009 ApJ 701 L114-L118 doi: 10.1088/0004-637X/701/2/L114|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||14 Sep 2009 19:13|
|Last Modified:||26 Dec 2012 11:17|
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