X‐Ray Spectral Properties of the Cluster Abell 2029

We have analyzed ASCA and ROSAT PSPC spectra and images of the galaxy clusterAbell 2029. The ASCA spectra of the cluster indicate that the gas temperaturedeclines with radius. The PSPC image shows that the cluster is very regular andsmooth. Also, there is no significant evidence for any irregularities in thetemperature distribution in the cluster, as would be produced by a subclustermerger. These results suggest that A2029 is a relaxed cluster, and that the gasis in hydrostatic equilibrium. We use the assumption of equilibrium todetermine the gravitational mass of the cluster as a function of radius. At aradius of 16' (1.92 h_50^-1 Mpc), the gravitational mass is M_tot =(9.42+-4.22) x 10^14 h_50^-1 Msun, while the mass of gas is M_gas =(2.52+-0.77) x 10^14 h_50^-5/2 Msun. The gas fraction is found to increase withradius; within a spherical radius of 16', the fraction is (M_gas/M_tot) =(0.26+-0.14) h_50^-3/2. The iron abundance in the gas is found to be(0.40+-0.04) of solar. There is no significant evidence for any variation inthe abundance with position in the cluster. The global X-ray spectra, centralX-ray spectra, and ROSAT surface brightness all require a cooling flow at thecluster center. The global X-ray spectrum implies that the total cooling rateis 363^+79_-96 h_50^-2 Msun/yr. The global X-ray spectra are consistent withthe Galactic value for the soft X-ray absorption toward the cluster. The PSPCspectra of the central regions of the cluster are inconsistent with the largevalue of foreground excess absorption found by White et al. (1991) based on theEinstein SSS spectrum. The upper limit on excess foreground absorption is 7.3 x10^19 cm^-2. However, the spectra do not rule a significant amount of intrinsicabsorbing gas located within the cooling flow region.Comment: ApJ, in press, 16 pages including 13 figures, formatted with emulateapj Latex styl