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The Radio Arc is one of the brightest systems of non-thermal filaments (NTFs)in the Galactic Center, located near several prominent HII regions (Sickle andPistol) and the Quintuplet stellar cluster. We present observations of the ArcNTFs using the S-, C-, and X-bands of the Very Large Array interferometer. Ourimages of total intensity reveal large-scale helical features that surround theArc NTFs, very narrow sub-filamentation, and compact sources along the NTFs.The distribution of polarized intensity is confined to a relatively small areaalong the NTFs. There are elongated polarized structures that appear to lacktotal intensity counterparts. We detect a range of rotation measure values from-1000 to -5800 rad m$\rm^{-2}$, likely caused by external Faraday rotationalong the line of sight. After correcting for Faraday rotation, the intrinsicmagnetic field orientation is found to generally trace the extent of the NTFs.However, the intrinsic magnetic field in several regions of the Arc NTFs showsan ordered pattern that is rotated with respect to the extent of the NTFs. Wesuggest this changing pattern may be caused by an additional magnetized sourcealong the line of sight, so that we observe two field systems superposed in ourobservations. We suggest that the large scale helical segments near the RadioArc could be components of such a source causing these changes in intrinsicmagnetic field, and some variations in the polarization and rotation measurevalues along the NTFs.

A VLA Polarimetric Study of the Galactic Center Radio Arc: Characterizing Polarization, Rotation Measure, and Magnetic Field Properties