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Astron. Astrophys. 332, 111-120 (1998)

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Radio pulsar microstructure at 1.41 and 4.85 GHz

Ch. Lange , M. Kramer , R. Wielebinski and A. Jessner

Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany

Received 12 June 1997 / Accepted 31 October 1997


We report on observations of microstructure at 4.85 and 1.41 GHz of pulsars strong enough for the observation of single pulses with time resolution between 7 µs and 160 µs. All five pulsars observed at 4.85 GHz show microstructure in a large fraction of their pulses. We confirm that microstructure seems to be a common property of the pulsar emission mechanism and not only an additional feature of some pulsars. We show that, for those pulsars observed earlier at lower frequencies, there is little variation in microstructure parameters at different frequencies. The fraction of pulses showing microstructure tends to be higher at 4.85 GHz when compared with lower frequency observations. We argue that the short time-scale of microstructure reflects the extension of the emitting structures.

Key words: methods: statistical – stars: neutron – pulsars individual: PSR B0329+54, PSR B0540+23, PSR B0823+26, PSR B0950+08

Send offprint requests to: C. Lange (clange@mpifr-bonn.mpg.de)

© European Southern Observatory (ESO) 1998

Online publication: March 10, 1998