Unusual Subpulse Modulation in PSR B0320+39

Abstract

We report on an analysis of the drifting subpulses of PSR B0320+39 that indicates a sudden step of ~180 degrees in subpulse phase near the centre of the pulse profile. The phase step, in combination with the attenuation of the periodic subpulse modulation at pulse longitudes near the step, suggests that the patterns arise from the addition of two superposed components of nearly opposite drift phase and differing longitudinal dependence. We argue that since there cannot be physical overlap of spark patterns on the polar cap, the drift components must be associated with a kind of ``multiple imaging'' of a single polar cap ``carousel'' spark pattern. One possibility is that the two components correspond to refracted rays originating from opposite sides of the polar cap. A second option associates the components with emission from two altitudes in the magnetosphere.

10 pages, 8 figures, accepted for publication in Astronomy & Astrophysics

References in corpus (4)

• Toward An Empirical Theory of Pulsar Emission. VII. On the Spectral Behavior of Conal Beam Radii and Emission Heights
• Drifting Sub-Pulse Analysis Using the Two-Dimensional Fourier Transform
• Understanding the radio emission geometry of multi-component radio pulsars from retardation and aberration effects
• Pulsar "Drifting"-Subpulse Polarization: No Evidence for Systematic Polarization-Angle Rotations

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• Neutron Star Physics in the Square Kilometer Array Era : An Indian Perspective
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• A model for double notches and bifurcated components in radio profiles of pulsars and magnetars - Evidence for the parallel acceleration maser in pulsar magnetosphere
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