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arXiv · 1310.6744

Weak lensing analysis of SZ-selected clusters of galaxies from the SPT and Planck surveys

D. Gruen·S. Seitz·F. Brimioulle·R. Kosyra·J. Koppenhoefer·C. -H. Lee·R. Bender·A. Riffeser·T. Eichner·T. Weidinger·M. Bierschenk
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Abstract

We present the weak lensing analysis of the Wide-Field Imager SZ Cluster of galaxy (WISCy) sample, a set of 12 clusters of galaxies selected for their Sunyaev-Zel'dovich (SZ) effect. After developing new and improved methods for background selection and determination of geometric lensing scaling factors from absolute multi-band photometry in cluster fields, we compare the weak lensing mass estimate with public X-ray and SZ data. We find consistency with hydrostatic X-ray masses with no significant bias, no mass dependent bias and less than 20% intrinsic scatter and constrain fgas,500c=0.128+0.029-0.023. We independently calibrate the South Pole Telescope significance-mass relation and find consistency with previous results. The comparison of weak lensing mass and Planck Compton parameters, whether extracted self-consistently with a mass-observable relation (MOR) or using X-ray prior information on cluster size, shows significant discrepancies. The deviations from the MOR strongly correlate with cluster mass and redshift. This could be explained either by a significantly shallower than expected slope of Compton decrement versus mass and a corresponding problem in the previous X-ray based mass calibration, or a size or redshift dependent bias in SZ signal extraction.

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D. Gruen, S. Seitz, F. Brimioulle, R. Kosyra, J. Koppenhoefer, C. -H. Lee, R. Bender, A. Riffeser, T. Eichner, T. Weidinger, M. Bierschenk. 2014-05-30. Weak lensing analysis of SZ-selected clusters of galaxies from the SPT and Planck surveys. https://doi.org/10.1093/mnras%2Fstu949

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