Pulsar Radio Emission from Expanding Charge Sheets

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

We semi-quantitatively calculate the distribution of energy in frequency and angle emitted from a sheet of charges that are moving out relativistically along dipolar magnetic field lines originating near the magnetic polar caps of a rotating neutron star. The angular distribution is conical with the angle of maximum intensity varying with frequency ω as ω-1/4 for ω≲ω c ≈2 c /(Rθ M 2), whereRθM is the initial angular radius of the charge sheet at the surface of the star of radiusR. At higher frequencies the width of the angular cone remains constant. The radiation is linearly polarized with the polarization vector in the plane of the line of sight and the magnetic axis. A sheet of uniform charge density and finite thickness has a frequency spectrum that varies from ω-3/2 to ω-4 for ω≲ω c and ω≲ω c , respectively. These features are in good general agreement with the observed characteristics of the intensity, pulse shape, and frequency spectrum of the radio pulses from pulsars.

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