Difference between the frequency dependences of the integrated-profile widths for millisecond and "normal" pulsars

Astronomy and Astrophysics – Astronomy

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Scientific paper

Based on our observations of millisecond pulsars, which have extended the frequency range of their study fourfold, we analyze the frequency dependence of the integrated profiles for millisecond pulsars. We have found that in contrast to the decrease in the integrated-profile width with frequency which is observed in "normal" pulsars and which follows from the universally accepted hollow-cone model, the integrated-profile width for millisecond pulsars is virtually constant with frequency. We suggest that since the radius of the light cylinder is smaller, the emitting region in millisecond pulsars is "pressed" against the neutron star and the levels of emergence of radiation at different frequencies are close together, while the magnetic field is multipole and the divergence of the field lines is small.

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