Volume 425, Number 2, October II 2004
|Page(s)||569 - 575|
|Section||Interstellar and circumstellar matter|
|Published online||21 September 2004|
The frequency evolution of interstellar pulse broadening from radio pulsars
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany e-mail: email@example.com
2 National Centre for Radio Astrophysics, TIFR, Pune University Campus, Ganeshkhind, Pune 411007, India
3 University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, UK
4 Inter-University Centre for Astronomy and Astrophysics, Pune University Campus, Ganeshkhind, Pune 411007, India
Accepted: 23 June 2004
In this paper we report multi-frequency measurements of pulse broadening times () for nine medium dispersion measure (DM pc cm-3) pulsars observed over a wide frequency range. The low frequency data at 243, 325 and 610 MHz are new observations done with the Giant Metrewave Radio Telescope (GMRT). The frequency dependence of for all but one (PSR B1933+16) of our sources is consistent with the Kolmogorov spectrum of electron density fluctuations in a turbulent medium. PSR B1933+16, however, shows a very flat spectrum as previously observed for high DM pulsars. Our observations combined with earlier published results enable us to study the spectral index of over the whole observed DM range. While the spectral properties are generally consistent with a Kolmogorov spectrum, pulsars seen along line-of-sights towards the inner Galaxy or complex regions often show deviations from this expected behaviour.
Key words: ISM: structure / scattering / stars: pulsars: general / stars: pulsars: individual: PSR B1933+16
© ESO, 2004
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