Issue |
A&A
Volume 425, Number 2, October II 2004
|
|
---|---|---|
Page(s) | 569 - 575 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20035881 | |
Published online | 21 September 2004 |
The frequency evolution of interstellar pulse broadening from radio pulsars
1
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany e-mail: loehmer@mpifr-bonn.mpg.de
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
Received:
16
December
2003
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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