Xmm - Newton Observation of the Cluster Zw 1305 . 4 + 2941 in the Field Sa 57

We report the details of an XMM observation of the cluster of galaxies Zw 1305.4+2941 at the intermediate redshift of z=0.241, increasing the small number of interesting X-ray constraints on properties of ∼ 3 keV systems above z=0.1. Based on the ∼ 45ks XMM observation, we find that within a radius of 228 kpc the cluster has an unabsorbed X-ray flux of fX = (2.07± 0.06)× 10 −13 ergs cm s, a temperature of kT = 3.17 ± 0.19 keV, in good agreement with the previous ROSAT determination, and an abundance of 0.93 −0.29 Z⊙. Within r500 = 723 ± 16 kpc the rest-frame bolometric X-ray luminosity is LX(r500) = (1.25 ± 0.16) × 10 44 h 70 ergs s . The cluster obeys the scaling relations for LX, T and the velocity dispersion σv derived at intermediate redshift for kT∼ < 4 keV, for which we provide new fits for all literature objects. The mass derived from an isothermal NFW model fit is, Mvir = 2.77± 0.21× 10 14 M⊙, with a concentration parameter, c = 7.9± 0.5. Subject headings: galaxies: clusters: general — X-rays: general