Radio Pulsar Death Line Revisited: Is PSR J2144-3933 Anomalous?
  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. 
Bing Zhang (1, 2), Alice K. Harding (1) and Alexander G. Muslimov (3)   ((1) NASA/GSFC, (2) NRC research associate, (3) SM&A...