Radio Pulsar Death Line Revisited: Is PSR J2144-3933 Anomalous?

Abstract

We reinvestigate the radio pulsar ``death lines'' within the framework of two different types of polar cap acceleration models, i.e., the vacuum gap model and the space-charge-limited flow model, with either curvature radiation or inverse Compton scattering photons as the source of pairs. General relativistic frame-dragging is taken into account in both models. We find that the inverse Compton scattering induced space-charge-limited flow model can sustain strong pair production in some long-period pulsars, which allows the newly detected 8.5s pulsar PSR J2144-3933 to be radio loud, without assuming a special neutron star equation-of-state or ad hoc magnetic field configurations.

replaced to meet the final version published in ApJ, 531, L135. The main revision is the discussion about the pulsar polar cap surface magnetic field, which reads $6.4\times 10^{19}\sqrt{P\dot{P}}$ regardless of the internal field structure (point dipole or uniformly magnetized interior). Therefore different assumptions of the internal magnetic fields have no infuence on the location of the deathlines

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• Pulsar Magnetospheric Emission Mapping: Images and Implications of Polar-Cap Weather
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