GASP星系JO36与GIN 049射电羽流的相遇
On the encounter between the GASP galaxy JO36 and the radio plume of GIN 049
AI总结：
本研究通过LOFAR和uGMRT观测发现旋涡星系JO36与射电星系GIN 049的射电羽流发生相互作用，导致JO36恒星形成率爆发（约14太阳质量/年），并在射电老等离子体中留下磁拖拽痕迹。
摘要：
我们报告了一项偶然发现：一个射电星系的射电瓣与一个旋涡星系之间发生了前所未有的相互作用。这一发现得益于LOFAR望远镜在144 MHz频率下对星系团Abell 160（$z=0.04317$）的观测，数据来自LOFAR两米巡天（LOFAR Two-metre Sky Survey）。新的低频观测显示，中心星系GIN 049的射电羽流之一与旋涡星系JO36重叠。此前利用MUSE进行的研究表明，JO36盘中的暖电离气体（以H$α$发射为示踪）相对于恒星盘被严重截断。我们通过纳入uGMRT在675 MHz的新观测来绘制谱指数，进一步探索这一独特系统。浮现的情景是：JO36在过去200-500百万年内与射电羽流发生了相互作用。这次相遇对JO36产生了正反馈效应，表现为恒星形成率爆发，约$14$ $M_\odot$ yr$^{-1}$。反过来，星系的经过通过在射电老等离子体中通过磁拖拽（magnetic draping）重塑老相对论性等离子体，留下了痕迹。
英文摘要：
We report on the serendipitous discovery of an unprecedented interaction between the radio lobe of a radio galaxy and a spiral galaxy. The discovery was made thanks to LOFAR observations at 144 MHz of the galaxy cluster Abell 160 ($z=0.04317$) provided by the LOFAR Two-metre Sky Survey. The new low-frequency observations revealed that one of the radio plumes of the central galaxy GIN 049 overlaps with the spiral galaxy JO36. Previous studies carried out with MUSE revealed that the warm ionized gas in the disk of JO36, traced by the H$α$ emission, is severely truncated with respect to the stellar disk. We further explore this unique system by including new uGMRT observations at 675 MHz to map the spectral index. The emerging scenario is that JO36 has interacted with the radio plume in the past 200-500 Myr. The encounter resulted in a positive feedback event for JO36 in the form of a star formation rate burst of $\sim14$ $M_\odot$ yr$^{-1}$. In turn, the galaxy passage left a trace in the radio-old plasma by re-shaping the old relativistic plasma via magnetic draping.
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