Temperature and total mass profiles of the A3571 cluster of galaxies

Abstract

We present BeppoSAX results of a spatially resolved spectral analysis of A3571, a relaxed nearby cluster of galaxies. In the central 2 0 (130 h 1 50 kpc) radius the metal abundance is 0:49 0:08 solar and the absorption (1:13 0:28) 10 21 atom cm 2 , whereas elsewhere within an 8 0 (520 h 1 50 kpc) radius the abundance is 0:32 0:05 solar and the absorption consistent with the galactic value of 4: 41 0 20 atom cm 2 . The signicant 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 40 M yr 1 from our spectral t. The BeppoSAX and ASCA radial temperature proles agree over the entire overlapping radial range r< 25 0 =1 .6h 1 50 Mpc. The combined BeppoSAX and ASCA temperature prole exhibits a constant value out to a radius of10 0 (650h 1 50 kpc) and a signicant decrease (T / r 0:55 , corresponding to =1 :28) at larger radii. These temperature data are used to derive the total mass prole. The best t NFW dark matter density model results in a temperature prole that is not convectively stable, but the model is acceptable within the uncertainties of the data. The temperature prole 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% condence errors within the virial radius r178 (2.5 h 1