The effect of HII regions on rotation measure of pulsars

Abstract

We have obtained new rotation measure 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$\sim$ 149${}^{\circ }$ (Region 1) and four pulsars towards l$\sim 113^{\circ }$ (Region 2) lie behind HII regions which seriously affects the pulsar rotation measures. The rotation measure of PSR J2337+6151 seem 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 $5.7\mu$G. For the large-scale component of the Galactic magnetic field we determine a field strength of $1.7\pm 1.0\mu$G. This average field is constant on Galactic scales lying within the Galactic longitude range of $85^{\circ }<$ l $<240^{\circ }$ 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.

arXiv commentReplaced by the printed version in Astronomy and Astrophysics and includes erratum and new reference

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• Galactic and extragalactic magnetic fields
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