Linear Polarization and Spectrum of PSR 0833?45 and the Effects of Scattering

Abstract

Linear polarization characteristics as well as pulse shape have been measured at Parkes for the average of many pulses from PSR 0833?45 at several frequencies between 300 and 1410 MHz. These confirm a previous conclusion, which was based on pulse shape measurements alone, that the change of pulse character with decreasing frequency can be explained in terms of interstellar scattering. The inferred effect of the scattering medium is explained on the assumption that it comprises many layers of weak uncorrelated density inhomogeneities. Also, some evidence is found for a weak "precursor" pulse, and the possible implications are discussed.