http://arxiv.org/abs/1407.7868
The first building block for using galaxy clusters in astrophysics and cosmology is an accurate determination of their mass, which can be estimated with weak lensing (WL) determinations or X-ray analyses assuming hydrostatic equilibrium (HE). By comparing the two mass proxies in well observed samples of rich clusters, we determined the intrinsic scatters, sigma_{WL}~15 per cent for WL masses and sigma_{HE}~25 per cent for HE masses. The certain assessment of the bias is hampered by differences as large as ~40 per cent in either WL or HE mass estimates reported by different groups. If the scatter in the mass proxy is not considered, the slope of any scaling relation `mass–observable’ is biased towards shallower values, whereas the intrinsic scatter of the scaling is over-estimated.
M. Sereno and S. Ettori
Thu, 31 Jul 14
16/52
Comments: 14 pages, 7 figures
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