The structure of integrated pulse profiles |
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Authors: | M Vivekanand V Radhakrishnan |
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Institution: | (1) Raman Research Institute, 560080 Bangalore |
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Abstract: | We offer two possible explanations to account for the characteristics of integrated pulse profiles, in particular their degree
of complexity, their variation from pulsar to pulsar, their stability, and the tendency of complex profiles to be associated
with older pulsars.
It is proposed that the pulse structure could be a reflection of surface irregularities at the polar caps, and it is shown
how the surface relief can affect the number of positrons released into the magnetosphere which are subsequently responsible
for the observed radio radiation. The electrons produced in the vacuum break-down in the gap carry enough energy to allow
creating such a surface relief in ∼ 106 years, and one way in which this could be achieved is discussed.
Alternatively, the presence of multipole components in the magnetic fields of older pulsars could lead to significant variations
in the curvature of the field lines across the gap, and hence to structure in the integrated pulse profiles. An assessment
of the two hypotheses from observed pulse profiles seems to favour the polar cap relief picture.
An erratum to this article is available at . |
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Keywords: | pulsars— integrated pulse profiles— polar cap model |
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