Analyzing the Intrinsic Magnetic Field in the Galactic Center Radio Arc

Abstract The Radio Arc is a system of organized nonthermal filaments (NTFs) located within the Galactic center (GC) region Milky Way. Recent observations NTFs revealed magnetic field that alternates between being parallel and rotated with respect to orientation filaments. This pattern in stark contrast predominantly orientations observed other GC NTFs. To help elucidate origin this pattern, we analyze spectro-polarimetric data using an Australian Telescope Compact Array set covering continuous frequency range from ?4 11 GHz at spectral resolution 2 MHz. We fit depolarization models polarization characterize Faraday effects along line sight. assess whether structures local may contribute unusual orientation. External are identified as most likely rotation for NTFs; however, internal also found be regions field. increased likelihood attributed GC. One such structure could Shell Future studies needed determine alternating present multi-stranded NTFs, or unique property resulting complex interstellar