论文标题
杠铃形的巨型射电星系，射流中有〜100 kpc扭结
Barbell-shaped giant radio galaxy with ~100 kpc kink in the jet
论文作者
论文摘要
我们首次使用GMRT（323、612和1300 MHz）和Lofar（144 MHz）的深层多频射无线电观察到对特殊的巨型射电宽银河系（GRG）J223301+131502进行研究。我们的观察结果已牢固地建立了0.09956的红移，并揭示了其出色的喷气结构，该结构延伸了$ \ sim $ 200 kpc，导致$ \ sim $ 100 kpc的特殊扭结结构。我们测量此GRG的整体尺寸为$ \ sim $ 1.83 MPC；它表现出没有任何突出的热点的裂片，并且与杠铃非常相似。我们深度的低频无线电图清楚地揭示了GRG裂片陡峭的散射发射。使用Lofar 144 MHz观测值和GMRT 323和612 MHz观测值的无线电数据估算了$ \ sim $ 5 $ 5 $ 5 $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $。我们讨论导致GRG观察到的扭结特征形成的可能原因，其中包括射流轴的动力，不稳定性的发展和磁重新连接。尽管杠铃GRG的尺寸很大，但仍发现杠铃GRG居住在低质量（M $ _ {200} \ sim 10^{14} $ $ $ \ rm m _ {\ odot} $）galaxy cluster中。这个带有双面大规模喷射的GRG，带有扭结和分散的外裂片，位于聚类环境中，为探索不同环境中GRG的结构和生长提供了机会。
We present for the first time a study of peculiar giant radio galaxy (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 $\sim$ 1.83 Mpc; it exhibits lobes without any prominent hotspots and closely resembles a barbell. 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 $μ$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 to explore the structure and growth of GRGs in different environments.
