| Issue |
A&A
Volume 398, Number 3, February II 2003
|
|
|---|---|---|
| Page(s) | 993 - 1005 | |
| Section | Galactic structure, stellar clusters, and populations | |
| DOI | https://doi.org/10.1051/0004-6361:20021702 | |
| Published online | 28 January 2003 | |
The effect of HII regions on rotation measure of pulsars
1
Max-Planck Institute für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
2
University of Manchester, Jodrell Bank Observatory, Macclesfield SK11 9DL, UK
Corresponding author: D. Mitra, dmitra@mpifr-bonn.mpg.de
Received:
15
July
2002
Accepted:
12
November
2002
We have obtained new rotation measures for 11 pulsars
observed with the Effelsberg 100-m radio telescope, in the direction
of the Perseus arm. Using a combination of 34 published
and the 11 newly measured pulsar rotation measures we study the
magnetic field structure towards the Perseus arm.
We find that two pulsars towards 
(Region 1)
and four pulsars towards 
(Region 2) lie behind
HII regions which seriously affect the pulsar rotation measures.
The rotation measure of PSR J2337+6151 seems to be affected by
its passage through the supernova remnant G114.3+0.3.
For Region 1, we are able to constrain
the random component of the magnetic field to 
G. For the
large-scale component of
the Galactic magnetic field we determine a field strength of
G. This average field is constant
on Galactic scales lying within the Galactic longitude range
of 
and we find no evidence for
large scale field reversal upto 5–6 kpc. We highlight
the great importance to include the effects of foreground emission
in any systematic study.
Key words: Galaxy: structure / magnetic fields / ISM: HII regions / stars: pulsars: general
© ESO, 2003
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