Polarized arcs near the Galactic Centre

We report on the results of a total intensity and polarization survey of the Galactic Centre region carried out with the Parkes 64-m telescope at a wavelength of λ3.5 cm and an angular resolution of 2.8' × 2.9'. The main result is the discovery of three arcs of polarized radio emission. Two of the arcs lie to the west and one to the east of Sagittarius A. Their axes lie orthogonal to the galactic plane. We confirm the presence of a major plume or arc structure to the east of Sagittarius A previously observed to abut the galactic plane near 0.2°. It is now found to be nearly 2° in extent, which is more extensive than previously thought