XMM‐NewtonObservation of the Cluster Zw 1305.4+2941 in the Field SA 57

Fabio Gastaldello, Dario Trevese, Fausto Vagnetti, Roberto Fusco‐Femiano
2008 Astrophysical Journal  
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 45 ks XMM observation, we find that within a radius of 228 kpc the cluster has an unabsorbed X-ray flux of 2.07 +/- 0.06 x 10^-13 erg/cm^2/s, a temperature of kT = 3.17 +/-0.19 keV, in good agreement with the previous ROSAT determination, and an
more » ... of 0.93 (+0.24,-0.29 solar. Within r_500 = 723 +/- 6 kpc the rest-frame bolometric X-ray luminosity is L_X (r_500)= 1.25 +/- 0.16 x 10^44 erg/s. The cluster obeys the scaling relations for L_X, T and the velocity dispersion 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, M_vir = 2.77 +/- 0.21 x 10^14 solar masses, with a concentration parameter, c = 7.9 +/- 0.5.
doi:10.1086/523937 fatcat:47iywaay3zbyrlbjiekgjmveui