论文标题
银河中心的新发现的南部纬度非热细丝的VLA研究：无线电连续性总强度和光谱指数特性
A VLA Study of Newly-Discovered Southern Latitude Non-Thermal Filaments in the Galactic Center: Radio Continuum Total-intensity and Spectral Index Properties
论文作者
论文摘要
在银河系区域的银河系中心（GC）几百个parsec中聚集的非热细丝（NTF）无线电结构显然是独特的。使用Meerkat在1 GHz处的GC的最新无线电图像显示，众多淡淡的，以前未知的NTF束（NTFBS），其中一些由多达10个或更多个单个丝状组成。在这项工作中，我们在C-和X频段（4-12 GHz）的Arcsecond尺度分辨率上介绍了非常大的阵列（VLA）观察结果，这些分辨率是这些新发现的NTFB的三个分辨率，这些分辨率都位于南部银河纬度地区。这些观察结果使我们能够将它们的总强度特性与较大的NTF人群的特性进行比较。我们发现，这些目标通常具有类似于较大NTF种群中观察到的属性。但是，较大的NTF群体通常具有比我们对所选靶标观察到的值更陡峭的频谱指数值。此处根据这些结构的总强度特性介绍的结果表明，NTF可能全部由宇宙射线（CRS）形成。这些CR是由附近的紧凑源产生的，然后沿NTF长度扩散，或者由扩展的磁性结构产生，其磁场会与NTF磁场重新连接。
The non-thermal filament (NTF) radio structures clustered within a few hundred parsecs of the Galactic Center (GC) are apparently unique to this region of the Galaxy. Recent radio images of the GC using MeerKAT at 1 GHz have revealed a multitude of faint, previously unknown NTF bundles (NTFBs), some of which are comprised of as many as 10 or more individual filaments. In this work we present Very Large Array (VLA) observations at C- and X-bands (4 - 12 GHz) at arcsecond-scale resolutions of three of these newly-discovered NTFBs, all located at southern Galactic latitudes. These observations allow us to compare their total-intensity properties with those of the larger NTF population. We find that these targets generally possess properties similar to what is observed in the larger NTF population. However, the larger NTF population generally has steeper spectral index values than what we observe for our chosen targets. The results presented here based on the total-intensity properties of these structures indicate that the NTFs are likely all formed from Cosmic Rays (CRs). These CRs are either generated by a nearby compact source and then diffuse along the NTF lengths or are generated by extended, magnetized structures whose magnetic field undergoes reconnection with the NTF magnetic field.
