Kinematics of Pulsar Beams
Open Access
- 1 July 1998
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 501 (1) , 228-241
- https://doi.org/10.1086/305804
Abstract
We have investigated in detail the geometry of the open magnetic field line structure of an oblique dipole rotator, with a view to attaining a better understanding of the geometry of pulsar beams in the polar cap model of pulsar emission. We find that the open field lines divide into two branches, both of which are required to describe the full polar cap. We have also investigated the possible changes in pulsar beams due to the spacetime curvature caused by the neutron star and the special relativistic aberration. Barring the light bending, which is treated numerically, we incorporate all other effects analytically. The formalism can be used for an arbitrary emission altitude and for all inclination angles between the magnetic and rotation axes. The combination of all these effects surprisingly leaves the Goldreich-Julian type beam essentially unaltered, owing to the mutually opposing nature of these effects. The general relativistic effects at most give a 4% beam squeeze. At a finer level, the possibility of seeing the resultant small effects in pulsar observations is indicated and briefly discussed.Keywords
This publication has 24 references indexed in Scilit:
- PrefaceInternational Astronomical Union Colloquium, 1996
- A Geometrical origin of the Pulsar Core and Conal EmissionsInternational Astronomical Union Colloquium, 1996
- General relativistic corrections in the gamma-ray emission from pulsarsThe Astrophysical Journal, 1994
- Magnetic field topology in pulsarsThe Astrophysical Journal, 1993
- Origin and radio pulse properties of millisecond pulsarsThe Astrophysical Journal, 1993
- The contribution of light bending and redshift to the pulse characteristics of a pulsar in the case of smaller neutron starsThe Astrophysical Journal, 1991
- A relativistic model of pulsar polarizationThe Astrophysical Journal, 1991
- The Mathematical Theory of Black HolesPublished by Springer Nature ,1984
- Electromagnetic field of a current loop around a Kerr black holePhysical Review D, 1975
- Pulsar ElectrodynamicsThe Astrophysical Journal, 1969