A Pulsational Model for the Orthogonal Polarization Modes in Radio Pulsars

Abstract

In an earlier paper, we introduced a model for pulsars in which non-radial oscillations of high spherical degree (\el) aligned to the magnetic axis of a spinning neutron star were able to reproduce subpulses like those observed in single-pulse measurements of pulsar intensity. The model did not address polarization, which is an integral part of pulsar emission. Observations show that many pulsars emit radio waves that appear to be the superposition of two linearly polarized emission modes with orthogonal polarization angles. In this paper, we extend our model to incorporate linear polarization. As before, we propose that pulsational displacements of stellar material modulate the pulsar emission, but now we apply this modulation to a linearly-polarized mode of emission, as might be produced by curvature radiation. We further introduce a second polarization mode, orthogonal to the first, that is modulated by pulsational velocities. We combine these modes in superposition to model the observed Stokes parameters in radio pulsars.

arXiv comment19 pages, 4 figures accepted ApJ

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Cited by in corpus (8)

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• A Quantitative Non-radial Oscillation Model for the Subpulses in PSR B0943+10
• Neutron Star Physics in the Square Kilometer Array Era : An Indian Perspective
• A Non-Radial Oscillation Model for Pulsar State Switching
• Electromagnetic fields in the exterior of an oscillating relativistic star -- II. Electromagnetic damping
• Circular polarization in radio pulsar PSR B1451-68: coherent mode transitions and intrabeam interference
• A Quantitative Model for Drifting Subpulses in PSR B0809+74
• PSR J0026-1955: A curious case of evolutionary subpulse drifting and nulling