Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aipc...56..373s&link_type=abstract
In: Particle acceleration mechanisms in astrophysics; Proceedings of the Workshop, La Jolla, Calif., January 3-5, 1979. (A80-532
Astronomy and Astrophysics
Astrophysics
4
Direct Current, Electric Fields, Particle Acceleration, Pulsars, Stellar Models, Electromagnetic Radiation, Electrostatics, Incoherent Scattering, Magnetic Fields, Neutron Stars, Periodic Variations, Poisson Equation, Stellar Luminosity, Stellar Mass Ejection, Stellar Structure
Scientific paper
Models of particle acceleration inside the light cylinder of a pulsar are reviewed. The models involve a steady component of electric field parallel to the magnetic field, in the frame rotating with the neutron star. The pulsed incoherent radiation (in particular X- and gamma-radiation) observed from four pulsars puts the most serious constraints on the models; the energy to explain the observations must be put into particles at low enough altitude that the magnetic field remains rigid. Models with acceleration occurring near the stellar surface are incapable of providing the energy for the Crab pulsar, and only barely able for the Vela pulsar. A high-altitude 'outer gap' can explain the Crab energy; outer gaps may not form for longer period pulsars. If the same mechanism is responsible for the similar gamma-ray pulse profiles of all four gamma-ray pulsars, outer gaps become unlikely. An alternative high-altitude acceleration model, involving a 'slot gap,' is mentioned; it too has difficulties but potentially can explain the pulse shapes.
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