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arXiv 1307.2986astro-ph.GA
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小直径年轻超新星遗迹G354 .4+0.0的发现

Discovery of a small diameter young supernova remnant G354.4+0.0

Subhashis Roy, Sabyasachi Pal

摘要:

我们报告发现了一个大小为1.6'的壳状结构G354.4+0.0,显示了壳状超新星遗迹的形态。部分结构在NRAO VLA巡天图上显示出偏振发射。基于330 MHz,1.4 GHz的巨米波射电望远镜(GMRT)观测和现有的高频观测,我们得出结论:显示同步辐射的部分壳层结构是嵌入在~ 4 '的扩展HII区中。扩散HII区域的频谱在1.4 GHz和330 MHz之间转换。HI吸收谱表明它位于距离太阳5 kpc以上的位置。根据形态,非热偏振发射和大小,该物体是银河系中发现的最年轻的超新星遗迹之一,估计年龄约为100-500年。

英文摘要:

We report discovery of a shell like structure G354.4+0.0 of size 1.6' that shows morphology of a shell supernova remnant. Part of the structure show polarized emission in NRAO VLA sky survey (NVSS) map. Based on 330 MHz, 1.4 GHz Giant Metrewave Radio Telescope (GMRT) observations and existing observations at higher frequencies, we conclude the partial shell structure showing synchrotron emission is embedded in an extended HII region of size ~4'. The spectrum of the diffuse HII region turns over between 1.4 GHz and 330 MHz. HI absorption spectrum shows it to be located more than 5 kpc away from Sun. Based on morphology, non-thermal polarized emission and size, this object is one of the youngest supernova remnants discovered in the Galaxy with an estimated age of about 100-500 years.

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