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- W3103606489 abstract "Here we analyze radio, optical, and X-ray data for a peculiar cluster Abell 578. This cluster is not fully relaxed and consists of two merging sub-systems. The brightest cluster galaxy, CGPG 0719.8+6704, is a pair of interacting ellipticals with projected separation $sim$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 $sim10^{-4}$ (for the estimated black hole masses of $sim 3 times 10^8,M_odot$ and $sim 10^9 , M_odot$). The gathered X-ray ({it 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 ($sim 60$,kpc projected) between the position of the brightest cluster galaxy 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 $sim 1.4$) and heated (from $simeq 2.0$,keV up to 2.7,keV), consistent with the presence of a weak shock (Mach number $sim 1.3$) driven by the expanding jet cocoon. This would then require the jet kinetic power of the order of $sim 10^{45}$,erg,s$^{-1}$, 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." @default.
- W3103606489 created "2020-11-23" @default.
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- W3103606489 date "2015-05-26" @default.
- W3103606489 modified "2023-10-03" @default.
- W3103606489 title "ON THE MERGING CLUSTER ABELL 578 AND ITS CENTRAL RADIO GALAXY 4C+67.13" @default.
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- W3103606489 doi "https://doi.org/10.1088/0004-637x/805/2/101" @default.
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