2005A&A...429...85Z

We present a detailed gravitational mass measurement based on the XMM-Newton imaging spectroscopy analysis of the lensing cluster of galaxies CL0024+17 at z=0.395. The emission appears approximately symmetric. However, on the scale of r ∼3.3' some indication of elongation is visible in the northwest-southeast (NW-SE) direction from the hardness ratio map (HRM). Within 3', we measure a global gas temperature of 3.52±0.17keV, metallicity of 0.22±0.07, and bolometric luminosity of 2.9±0.1x10⁴⁴h^–2₇₀erg/s. We derive a temperature distribution with an isothermal temperature of 3.9keV to a radius of 1.5' and a temperature gradient in the outskirts (1.3'<r<3'). Under the assumption of hydrostatic equilibrium, we measure gravitational mass and gas mass fraction to be M₂₀₀=2.0±0.3x10¹⁴h₇₀^–1M_☉ and f_gas=0.20±0.03h^–3/2₇₀ at r₂₀₀=1.05 h^–1₇₀Mpc using the observed temperature profile. The complex structure in the core region is the key to explaining the discrepancy in gravitational mass determined from XMM-Newton X-ray observations and HST optical lensing measurements.