The effect of HII regions on rotation measure of pulsars

被引:82
作者
Mitra, D
Wielebinski, R
Kramer, M
Jessner, A
机构
[1] Max Planck Inst Radioastron, D-53121 Bonn, Germany
[2] Univ Manchester, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England
关键词
Galaxy : structure; magnetic fields; ISM : HII regions; stars : pulsars : general;
D O I
10.1051/0004-6361:20021702
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 l similar to 149degrees (Region 1) and four pulsars towards l similar to 113degrees (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 5.7 muG. For the large-scale component of the Galactic magnetic field we determine a field strength of 1.7 +/- 1.0 muG. This average field is constant on Galactic scales lying within the Galactic longitude range of 85degrees < l < 240degrees 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.
引用
收藏
页码:993 / 1005
页数:13
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