The ionized gas in the Galactic Center Radio Arc

The Radio Arc is one of the most prominent radiocontinuum features in the Galactic center region. It is composed by long and thin filaments that emit non-thermal radiation (Non-Thermal Filaments; NTFs) and indicate the presence of a strong component of the magnetic field perpendicular to the Galactic plane. The Arc is apparently connected to Sgr A by a ‘bridge’ of arched filaments that emit thermal radiocontinuum (Thermal Filaments). There are two other thermal sources in the vicinity of the NTFs: the Sickle and the Pistol Nebula.