Astronomy and Astrophysics, volume 482, 451-472 (2008/5-1)
LoCuSS: comparison of observed X-ray and lensing galaxy cluster scaling relations with simulations.
ZHANG Y.-Y., FINOGUENOV A., BOEHRINGER H., KNEIB J.-P., SMITH G.P., KNEISSL R., OKABE N. and DAHLE H.
Abstract (from CDS):
The Local Cluster Substructure Survey (LoCuSS, Smith et al., in prep.) is a systematic multi-wavelength survey of more than 100 X-ray luminous galaxy clusters in the redshift range 0.14-0.3 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 (S-T, S-YX, P-YX, M-T, M-YX, M-Mgas, Mgas-T, L-T, L-YX, and L-M) obey empirical self-similarity and reveal no additional evolution beyond the large-scale structure growth. They also reveal up to 17 per cent segregation between all 37 clusters and non-cool core clusters. 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±0.08, setting the limit of the non-thermal pressure support to 9 ±8 per cent. The mean of the weak lensing mass to X-ray based mass ratio of these clusters is ∼1, indicating good agreement between X-ray and weak lensing masses for most clusters, although with 31-51 per cent scatter. The scatter in the mass-observable relations (M-YX, M-Mgas, and M-T) is smaller using X-ray based masses than using weak lensing masses by a factor of 2. With the scaled radius defined by the YX profile - r500^ YX,X^, r500^Y_ X_,wl^, and r500YX_,si^, we obtain lower scatter in the weak lensing mass based mass-observable relations, which means the origin of the scatter is Mwl and M^ X^ instead of YX. The normalization of the M-Y_ X_ relation using X-ray mass estimates is lower than the one from simulations by up to 18-24 per cent at 3σ significance. This agrees with the M-YX relation based on weak lensing masses, the normalization of the latter being ∼20 per cent lower than the one from simulations at ∼2σ significance. This difference between observations and simulations is also indicated in the M-Mgas and M-T relations. Despite the large scatter in the comparison of X-ray to lensing, the agreement between these two completely independent observational methods is an important step towards controlling astrophysical and measurement systematics in cosmological scaling relations.
cosmology: observations - galaxies: clusters: general - X-rays: galaxies: clusters - dark matter - cosmology: gravitational lensing
+ corrigendum vol. 527, C3 (2011)
Tables in Appendix: RXC J0645.4-5413 is probably 1RXS J064529.1-541338 in Simbad, RXC J0958.3-1103 is 1RXS J095821.8-110344.
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