2001A&A...369..459N

We present BeppoSAX results of a spatially resolved spectral analysis of A3571, a relaxed nearby cluster of galaxies. In the central 2' (130h₅₀^–1kpc) radius the metal abundance is 0.49±0.08 solar and the absorption (1.13±0.28)x10²¹atom/cm², whereas elsewhere within an 8' (520h₅₀^–1kpc) radius the abundance is 0.32±0.05 solar and the absorption consistent with the galactic value of 4.4x10²⁰atom/cm². The significant central metal abundance enhancement is consistent with the supernova enrichment scenario. The excess absorption may be attributed to the cooling flow, whose mass flow rate is 80±40M_☉/yr from our spectral fit. The BeppoSAX and ASCA radial temperature profiles agree over the entire overlapping radial range r<25'=1.6h₅₀^–1Mpc. The combined BeppoSAX and ASCA temperature profile exhibits a constant value out to a radius of ∼10' (650h₅₀^–1kpc) and a significant decrease (T∝r^–0.55, corresponding to γ=1.28) at larger radii. These temperature data are used to derive the total mass profile. The best fit NFW dark matter density model results in a temperature profile that is not convectively stable, but the model is acceptable within the uncertainties of the data. The temperature profile is acceptably modeled with a ``core'' model for the dark matter density, consisting of a core radius with a constant slope at larger radii. With this model the total mass and formal 90% confidence errors within the virial radius r₁₇₈ (2.5h₅₀^–1Mpc) are 9.1^+3.6_–1.5x10¹⁴h₅₀^–1M_☉, by a factor of 1.4 smaller than the isothermal value. The gas mass fraction increases with radius, reaching f_gas(r₁₇₈)=0.26^+0.05_–0.10xh₅₀^–3/2. Assuming that the measured gas mass fraction is the lower limit to the primordial baryonic fraction gives Ω_m<0.4 at 90% confidence.