paper

LoCuSS: Comparison of Observed X-ray and Lensing Galaxy Cluster Scaling Relations with Simulations

arXiv:0802.0770 · doi:10.1051/0004-6361:20079103

Abstract

The Local Cluster Substructure Survey (LoCuSS, Smith et al.) is a systematic multi-wavelength survey of >100 X-ray luminous galaxy clusters (0.14<z<0.3) selected from the ROSAT all sky survey. We used data on 37 LoCuSS clusters from the XMM-Newton archive to investigate the global scaling relations of galaxy clusters. The scaling relations based solely on the X-ray data obey empirical self-similarity and reveal no additional evolution beyond the LSS growth. Weak lensing mass measurements are also available in the literature for 19 of the clusters with XMM-Newton data. The average of the weak lensing mass to X-ray based mass ratio is 1.09+/-8, setting the limit of the non-thermal pressure support to 9+/-8%. The mean of the weak lensing mass to X-ray based mass ratio of these clusters is ~1 with 31-51% scatter. The scatter in the mass--observable relations (M-Y_X, M-M_{gas} and M-T) is smaller using X-ray based masses than using weak lensing masses by a factor of 2. Using the scaled radius defined by the Y_X profile, we obtain lower scatter in the weak lensing mass based mass--observable relations. The normalization of the M-Y_X relation (also M-M_{gas} and M-T relations) using X-ray (weak lensing) mass estimates is lower than the one from simulations by up to 20% at ~3 sigma (~2 sigma) significance. Despite the large scatter in the X-ray to lensing comparison, the agreement between these two completely independent observational methods is an important step towards controlling astrophysical and measurement systematics in cosmological scaling relations.

56 pages, 32 figure, 2008A&A...482..451Z, typos corrected in Table A.1

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