Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-10-07
Astronomy and Astrophysics
Astrophysics
4 pages, 1 figure, in Proc. of the 26th International Cosmic Ray Conference, Vol. IV (1999), p. 93
Scientific paper
Developments over the last couple of years have supported the interpretation that anomalous X-ray pulsars (AXPs) and soft gamma repeaters (SGRs) possess unusually high magnetic fields, and furthermore may represent a class or classes of neutron stars distinct from the population of conventional radio pulsars. We have recently suggested that such a dichotomization of the pulsar population may naturally arise due to the inherently different conditions in subcritical and supercritical magnetic fields. In this paper, we summarize, within the polar gap model, expectations for observable properties of highly magnetized pulsars, conventional or anomalous. This includes a discussion of the potential suppression of pair production and cascade generation in very strong fields by photon splitting and by threshold pair creation, which might explain radio quiescence in AXPs and SGRs. X-ray and hard gamma-ray spectral properties and trends are identified, with a view to establishing goals for future high energy experimental programs.
Baring Matthew G.
Harding Alice K.
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