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- W3201998818 abstract "We present original GMRT radio observations of the galaxy cluster Abell~725, at a redshift of 0.09, along with other archival observations. Our GMRT maps reveal two steep-spectrum diffuse filaments in the cluster, along with a previously reported arc-like structure, and a wide-angle tail (WAT) radio source associated with the Brightest Cluster Galaxy (BCG) at the periphery of the cluster. The bent morphology of the WAT indicates that its jets have been swept back by the dynamic pressure resulting from the motion of the BCG through the surrounding intracluster medium. The BCG associated with the WAT hosts a black hole whose mass we estimate to be 1.4$pm0.4 times10^{9} Msun$. We observe a 2arcmin (195,kpc in projection) offset between the BCG and the X-ray centroid of the galaxy cluster, which, along with other dynamic features, indicates the cluster's early stage of evolution. The WAT radio galaxy, the arc and the filaments have spectral indices $alpha_{612}^{240}= -0.46pm 0.15$, $-0.8pm0.3$, and ($-1.13pm 0.48$, $-1.40pm 0.50$), respectively. The WAT and the arc are connected structures, while the filaments are detached from them, but are found to be along the trail of the WAT. Based on the morphology of the components, and the progressive steepening of the components from the core of the WAT to the filaments, we propose that this system is a radio galaxy with trailing antique filaments." @default.
- W3201998818 created "2021-10-11" @default.
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- W3201998818 date "2021-10-07" @default.
- W3201998818 modified "2023-09-27" @default.
- W3201998818 title "GMRT unveils steep-spectrum antique filaments in the galaxy cluster Abell 725" @default.
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