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Issue A&A
Volume 448, Number 3, March IV 2006
Page(s) 1139 - 1148
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20053259

A&A 448, 1139-1148 (2006)
DOI: 10.1051/0004-6361:20053259

Frequency dependence of orthogonal polarisation modes in pulsars

J. M. Smits1, B. W. Stappers2, 3, R. T. Edwards4, J. Kuijpers1 and R. Ramachandran5

1  Department of Astrophysics, Radboud University Nijmegen, Nijmegen, The Netherlands
    e-mail: R.Smits@science.ru.nl
2  ASTRON, Dwingeloo, The Netherlands
3  Astronomical Institute "Anton Pannekoek", Amsterdam, The Netherlands
4  Australia Telescope National Facility, CSIRO, Australia
5  Department of Astronomy, University of California, Berkeley, USA

(Received 18 April 2005 / Accepted 21 November 2005 )

Abstract
We have carried out a study of the orthogonal polarisation mode behaviour as a function of frequency of 18 pulsars, using average pulsar data from the European Pulsar Network (EPN). Assuming that the radiation consists of two 100% polarised completely orthogonal superposed modes we separated these modes, resulting in average pulse profiles of each mode at multiple frequencies for each pulsar. Furthermore, we studied the frequency dependence of the relative intensity of these modes. We found in many pulsars that the average pulse profiles of the two modes differ in their dependence on frequency. In particular, we found that pulse components that are dominated by one mode tend to increase in intensity with increasing frequency with respect to the rest of the profile.


Key words: pulsar: general -- polarization

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