Propagation-induced circular polarisation in synchrotron sources

被引：69

作者：

Kennett, M ^{[1
]}

Melrose, D ^{[1
]}

机构：

[1] Univ Sydney, Sch Phys, Res Ctr Theoret Astrophys, Sydney, NSW 2006, Australia

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA | 1998年 / 15卷 / 02期

关键词：

polarisation; radiative transfer; radio continuum; general;

D O I：

10.1071/AS98211

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The small degree of circular polarisation observed in some synchrotron sources has a frequency dependence that is not consistent with simple predictions based on the intrinsic circular polarisation of synchrotron emission. The suggestion is explored that the circular polarisation arises as a propagation effect within the source. The physical basis of this alternative mechanism is the fact that the natural wave modes of a synchrotron emitting gas are linearly polarised, allowing partial conversion of linear into circular polarisation as in a quarter-wave plate. A relativistic rotation measure (RRM) is defined to characterise the magnitude of this effect.

引用

页码：211 / 216

页数：6

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