We report the discovery of a system of isolated nonthermal filaments approximately 0.5 deg. northwest (75 pc in projection) of Sgr A. Unlike other isolated nonthermal filaments which show subfilamentation, braiding of subfilaments, and flaring at their ends, these filaments are simple linear structures and more closely resemble the parallel bundled filaments in the Galactic center radio arc. However, the most unusual feature of these filaments is that the 20/90 cm spectral index uniformly decreases as a function of length, in contrast to all other nonthermal filaments in the Galactic center. This spectral gradient may not be due to simple particle aging but could be explained by a curved electron energy spectrum embedded in a diverging magnetic field. If so, the scale of the magnetic gradient is not consistent with a large scale magnetic field centered on Sgr A* suggesting that this filament system is tracing a local magnetic field.
展开▼
机译：我们报告发现隔离的非热丝约0.5度的系统的发现。 Sgr A的西北方向（投影时为75 pc）。与其他孤立的非热丝显示亚丝，亚丝编织并在其末端张开不同，它们是简单的线性结构，更类似于银河系中心无线电弧中的平行捆绑丝。但是，这些细丝的最不寻常的特征是，与银河系中心的所有其他非热性细丝相反，20/90 cm光谱指数随长度而均匀减小。该光谱梯度可能不是由于简单的粒子老化造成的，而是可以通过嵌入发散磁场中的弯曲电子能谱来解释。如果是这样，则磁梯度的大小与以Sgr A *为中心的大尺度磁场不一致，表明该灯丝系统正在跟踪局部磁场。
展开▼
