2001MNRAS.324..877A

We present spatially resolved X-ray spectroscopy of the luminous lensing cluster Abell 2390, using observations made with the Chandra observatory. The temperature of the X-ray gas rises with increasing radius within the central ∼200kpc of the cluster, and then remains approximately isothermal, with kT=11.5-1.6+1.5keV, out to the limits of the observations at r∼1.0Mpc. The total mass profile determined from the Chandra data has a form in good agreement with the predictions from numerical simulations. Using the parametrization of Navarro, Frenk and White, we measure a scale radius r_s∼0.8Mpc and a concentration parameter c∼3. The best-fitting X-ray mass model is in good agreement with independent gravitational lensing results and optical measurements of the galaxy velocity dispersion in the cluster. The X-ray gas to total mass ratio rises with increasing radius with f_gas∼21 per cent at r=0.9Mpc. The azimuthally averaged 0.3-7.0keV surface brightness profile exhibits a small core radius and a clear `break' at r∼500kpc, where the slope changes from S_X∼ ∝r^–1.5 to S_X∼ ∝r^–3.6. The data for the central region of the cluster indicate the presence of a cooling flow with a mass deposition rate of 200-300M_☉yr^–1 and an effective age of 2-3Gyr.