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Abstract
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 similar or equal to 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.
Original language | English |
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Pages (from-to) | L114-L118 |
Journal | The Astrophysical Journal |
Volume | 701 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Aug 2009 |
Keywords
- galaxies: clusters: general
- gravitational lensing
- cosmology: observations
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Birmingham Astrophysics - Rolling Grant 2007-2012
Ponman, T. (Principal Investigator), Cruise, M. (Co-Investigator), Freise, A. (Co-Investigator), Raychaudhury, S. (Co-Investigator), Smith, G. (Co-Investigator), Speake, C. (Co-Investigator), Stevens, I. (Co-Investigator) & Vecchio, A. (Co-Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/04/07 → 31/03/12
Project: Research Councils