X-RAY PROPERTIES OF THE NON-COOL-CORE CLUSTER OF GALAXIES ABELL 2147

Abstract

XMM-Newton data of the medium-richness non-cD cluster of galaxies Abell 2147, at a redshift of z= 0.035, were analyzed for radial distributions of its X-ray surface brightness, temperature, and metal abundances. The measured X-ray temperature is constant at 5.2 ± 0.8 keV up to ~3’ (~ 130 kpc) from the center, while it decreases to ≤ 3.5 keV at ~13’ (~ 600 kpc). The obtained abundance profile is consistent with being constant at 0.26 ± 0.08 times the Solar value, although a slight outward decrease is suggested. The X-ray surface brightness can be described by a single -model, with = 0.50 ± 0.14 and a core radius of 145” ± 45” = 105 ± 33 kpc. These properties of Abell 2147 agree with those of the best-studies non-cD cluster, Abell 1060. When compared with typical cD clusters, Abell 2147 agrees in its X-ray properties in outer regions, including in particular the outward temperature decrease. However, in the central regions (within ~ 100 kpc), Abell 2147, as well as Abell 1060, lacks major characteristics seen in many cD clusters; the temperature decrease, the abundance enhancements, and evidence for nested two scale lengths in the gravitational potential.