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We present gas and total mass profiles for 13 low-redshift, relaxed clusters spanning a temperature range 0. 7-9 keV, derived from all available Chandra data of sufficient quality. In all clusters, gas temperature profiles are measured to large radii (Vikhlinin et al. ) so that direct hydrostatic mass estimates are possible to nearly r₅00 or beyond. The gas density was accurately traced to larger radii; its profile is not described well by a beta-model, showing continuous steepening with radius. The derived rhoₜot profiles and their scaling with mass generally follow the Navarro-Frenk-White model with concentration expected for dark matter halos in LambdaCDM cosmology. In the inner region (r<0. 1r₅00), the gas density and temperature profiles exhibit significant scatter and trends with mass, but they become nearly self-similar at larger radii. Correspondingly, we find that the slope of the mass-temperature relation for these relaxed clusters is in good agreement with the simple self-similar behavior, M₅00 ~ Tᵃlpha, where alpha= (1. 5-1. 6) +-0. 1, if the gas temperatures are measured excluding the central cool cores. The normalization of this M-T relation is significantly, by =~ 30%, higher than most previous X-ray determinations. We derive accurate gas mass fraction profiles, which show increase both with radius and cluster mass. The enclosed fgas profiles within r₂500 =~ 0. 4 r₅00 have not yet reached any asymptotic value and are still far (by a factor of 1. 5-2) from the Universal baryon fraction according to the CMB observations. The fgas trends become weaker and its values closer to Universal at larger radii, in particular, in spherical shells r₂500<r<r₅00.
Vikhlinin et al. (Mon,) studied this question.