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Astron. Astrophys. 352, 489-494 (1999)

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Unusual frequency dependence of the width of integrated profiles of millisecond pulsars

A.D. Kuzmin and B.Ya. Losovsky

Pushchino Radio Astronomical Observatory, Astro Space Center, Lebedev Physical Institute, Pushchino, Moscow Reg., 142292, Russia (akuzmin@prao.psn.ru)

Received 15 March 1999 / Accepted 6 September 1999

Abstract

We have performed a comparative analysis of the frequency dependence of the profile widths of millisecond and normal pulsars. In this study we combine our 102 MHz observations with data at higher frequencies borrowed from the literature. We find that the profile width of millisecond pulsars remains nearly constant in the frequency range between 102 and 1400 MHz. This is in contrast with what is known for much slower pulsars where typically the pulse profile narrows significantly at the same frequency range. Our findings indicate that the geometry of the radio emission region of millisecond pulsars differs from that of normal pulsars. We therefore suggest that either the magnetic field configuration in millisecond pulsar magnetospheres deviates from that of a pure dipole, or (and) the radio emission region is compressed.

Key words: stars: magnetic fields – stars: pulsars: general

Send offprint requests to: A. Kuzmin

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© European Southern Observatory (ESO) 1999

Online publication: December 2, 1999
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