Exploring the Absolute Orthogonal Polarization-Mode Geometry of Outer-Edge Conal Emission

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Pulsars, Neutron Stars, Radiation Mechanisms, Polarization, Magnetohydrodynamics And Plasmas, Supernovae

Scientific paper

The Johnston et al. (2006) demonstration that natal supernovae ``kinks'' tend to orient a pulsar's rotation axis Ω with its proper-motion direction Aν potentially provides the important possibility of determining how pulsar radiation is polarized with respect to the projected magnetic field direction. Although orthogonal polarization mode (OPM) emission has been detected in most pulsars, heretofore no means has been available to fix its absolute direction. Were we thus able to distinguish the OPM orientation, one or the other could be associated with the O or X propagation mode and the implications explored physically. Then, if the O-mode displacements are in the expected direction, magnetospheric refraction provides a very plausible mechanism. Concretely, the outer edges of conal profiles are almost always highly depolarized through the incoherent mixing of roughly equal OPM levels-requiring them to be offset in both magnetic colatitude and longitude. We inquire whether these differential OPM offsets result from magnetospheric refraction. We expand on these various circumstances below, and show how they can be applied in practice.

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