A Survey of the Anticentre Region of the Galaxy at 237 Mc/s

Abstract

A part of the galactic plane 700 square degrees in area was mapped with a 1°.1 × 1°.2 beam at 237 Mc/s. The disk component of galactic radiation is still distinguishable in this anticentre region although it is largely resolved into irregular emission areas. Any uniform emission from the galactic disk appears to be less than 20 °K compared with a mean brightness temperature of the resolved regions of 80 °K. It is concluded that the bulk of the disk radiation, assumed to be of synchrotron origin, comes from localized regions of high magnetic field or cosmic ray density, or both, as are found for example in supernova remnants. This removes the difficulty of requiring a high uniform magnetic field to explain the emission from the disk component.