http://arxiv.org/abs/2209.13059
We present here for the first time a study of a peculiar giant radio galaxy (GRG) – GRG-J223301+131502 using deep multi-frequency radio observations from GMRT (323, 612, and 1300 MHz) and LOFAR (144 MHz) along with optical spectroscopic observations with the WHT 4.2m optical telescope. Our observations have firmly established its redshift of 0.09956 and unveiled its exceptional jet structure extending more than $\sim$200 kpc leading to a peculiar
kink' structure of $\sim$100 kpc. We measure the overall size of this GRG to be 1.83 Mpc, which exhibits lobes without any prominent hotspots and closely resembles aBarbell’. Our deep low-frequency radio maps clearly reveal the steep-spectrum diffuse emission from the lobes of the GRG. The magnetic field strength of $\sim$ 5 $\mu$G and spectral ages between about 110 to 200 mega years for the radio lobes were estimated using radio data from LOFAR 144 MHz observations and GMRT 323 and 612 MHz observations. We discuss the possible causes leading to the formation of the observed `kink’ feature for the GRG, which includes precession of the jet axis, development of instabilities and magnetic reconnection. Despite its enormous size, the Barbell GRG is found to be residing in a low mass (M${200} \sim 10^{14}$ $\rm M{\odot}$) galaxy cluster. This GRG with two-sided, large-scale jets with a kink and diffuse outer lobes residing in a cluster environment, provides an opportunity of exploring the structure and growth of GRGs in different environments.
P. Dabhade, T. Shimwell, J. Bagchi, et. al.
Wed, 28 Sep 22
9/89
Comments: Accepted for publication in A&A. 17 Pages, 7 figures and 6 tables. Comments are welcome
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