Astrophys. J., 805, 101 (2015/June-1)
On the merging cluster Abell 578 and its central radio galaxy 4C+67.13.
HAGINO K., STAWARZ L., SIEMIGINOWSKA A., CHEUNG C.C., KOZIEL-WIERZBOWSKA D., SZOSTEK A., MADEJSKI G., HARRIS D.E., SIMIONESCU A. and TAKAHASHI T.
Abstract (from CDS):
Here we analyze radio, optical, and X-ray data for the peculiar cluster Abell 578. This cluster is not fully relaxed and consists of two merging sub-systems. The brightest cluster galaxy (BCG), CGPG 0719.8+6704, is a pair of interacting ellipticals with projected separation ∼10 kpc, the brighter of which hosts the radio source 4C+67.13. The Fanaroff-Riley type-II radio morphology of 4C+67.13 is unusual for central radio galaxies in local Abell clusters. Our new optical spectroscopy revealed that both nuclei of the CGPG 0719.8+6704 pair are active, albeit at low accretion rates corresponding to the Eddington ratio ∼ 10–4 (for the estimated black hole masses of ∼3 x 108M☉ and ∼ 109 M☉). The gathered X-ray (Chandra) data allowed us to confirm and to quantify robustly the previously noted elongation of the gaseous atmosphere in the dominant sub-cluster, as well as a large spatial offset (∼60 kpc projected) between the position of the BCG and the cluster center inferred from the modeling of the X-ray surface brightness distribution. Detailed analysis of the brightness profiles and temperature revealed also that the cluster gas in the vicinity of 4C+67.13 is compressed (by a factor of about ∼1.4) and heated (from ~= 2.0 keV up to 2.7 keV), consistent with the presence of a weak shock (Mach number ∼1.3) driven by the expanding jet cocoon. This would then require the jet kinetic power of the order of ∼1045 erg/s, implying either a very high efficiency of the jet production for the current accretion rate, or a highly modulated jet/accretion activity in the system.
galaxies: active - galaxies: clusters: individual: Abell 578 - galaxies: individual: 4C+67.13 - galaxies: jets - intergalactic medium - X-rays: galaxies: clusters
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