论文标题
奇数无线电圈子作为内部介质中的超新星残留物
Odd Radio Circles as supernovae remnants in the intragroup medium
论文作者
论文摘要
最近发现的Arcmin大小的圆形扩散无线电源的可测量分数（$ \ sim8 $）可以在本地组及其直接邻居的星系组中，被称为奇数无线电圆或兽人。该估计值基于附近的群内超新星事件的光学检测率（$ z \ sim 0.1-0.2 $）组。预计在当地及其直接邻居星系中，每百万年度内无菌的速率约为5400个。对于$ 10^{4} $年的无线电可探测性期，平均每1000平方英尺的1.3个中型超新星残留物将在无线电调查中检测到具有敏感性，从而导致兽人发现。预期，超新星残留物的角度，表面亮度和无线电磁通量可预期在$ \ sim3 $ mpc的距离内，预计将与五个已知的兽人相似。群体内的超新星残留物并不居住在星系的密集和冷的星际媒介中，而是在低密度（$ 10^{ - 4} -4} -10^{ - 5} $ cm $^{ - 3} $中与乳白色和其他附近星系周围的各种潮汐流媒体相关的光。
A measurable fraction ($\sim8$ per cent) of recently discovered arcmin-size circular diffuse radio sources termed as Odd Radio Circles or ORCs can be supernovae remnants in the intragroup medium, within the local group and its immediate neighbour groups of galaxies. This estimate is based on the optical detection rate of the intragroup supernovae events in the nearby ($z \sim 0.1-0.2$) galaxy groups. A rate of about 5400 intragroup supernovae per million year is expected within the local and its immediate neighbour groups of galaxies. For a radio detectability period of about $10^{4}$ years, on average 1.3 intragroup medium supernovae remnants per 1000 square degree are expected to be detected in the radio surveys with a sensitivity that led to discovery of ORCs. The angular size, surface brightness and radio flux of the supernova remnants up to a distance of $\sim3$ Mpc in the intragroup medium can be expected to be similar to the five known ORCs. The intragroup supernovae remnants are not residing in the dense and cold interstellar medium of the galaxies but evolving in low density ($10^{-4}-10^{-5}$ cm$^{-3}$) warm medium ($10^{5}-10^{6}$ K) in galactic halos or beyond, and may find their progenitors in the diffuse stellar light associated with various tidal streamers surrounding the Milky-Way and other nearby galaxies.
