LoCuSS: A COMPARISON OF SUNYAEV-ZEL'DOVICH EFFECT AND GRAVITATIONAL-LENSING MEASUREMENTS OF GALAXY CLUSTERS
- Kavli Institute for Cosmological Physics, Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637 (United States)
- School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT (United Kingdom)
- California Institute of Technology, Mail Code 105-24, Pasadena, CA 91125 (United States)
- Space Science Office, VP62, NASA/Marshall Space Flight Center, Huntsville, AL 35812 (United States)
- Department of Physics, University of Alabama, Huntsville, AL 35812 (United States)
- Laboratoire d'Astrophysique de Marseilles, OAMP, CNRS-Universite Aix-Marseilles, 38 rue Frederic Joliot-Curie, 13388 Marseilles Cedex 13 (France)
- Owens Valley Radio Observatory, California Institute of Technology, Big Pine, CA 93513 (United States)
- Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027 (United States)
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 {approx_equal} 0.2 from the Local Cluster Substructure Survey. We measure the integrated Compton y-parameter, Y, and total projected mass of the clusters (M {sub 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 {sub 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{sub X} . We also find no evidence of segregation in Y between disturbed and undisturbed clusters, as had been seen with T{sub 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 {sub GL} = 0.98 {+-} 0.13 M {sub 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.
- OSTI ID:
- 21319502
- Journal Information:
- Astrophysical Journal (Online), Vol. 701, Issue 2; Other Information: DOI: 10.1088/0004-637X/701/2/L114; Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-4357
- Country of Publication:
- United States
- Language:
- English
Similar Records
LoCuSS: THE SUNYAEV-ZEL'DOVICH EFFECT AND WEAK-LENSING MASS SCALING RELATION
A NEW APPROACH TO OBTAINING CLUSTER MASS FROM SUNYAEV-ZEL'DOVICH EFFECT OBSERVATIONS