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Simultaneous single-pulse observations of radio pulsars - III. The behaviour of circular polarization
被引:27
作者:
Karastergiou, A
Johnston, S
Kramer, M
机构:
[1] Max Planck Inst Radioastron, D-53121 Bonn, Germany
[2] Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia
[3] Univ Manchester, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England
关键词:
pulsars : individual : PSR B1133+16;
polarization;
D O I:
10.1051/0004-6361:20030433
中图分类号:
P1 [天文学];
学科分类号:
0704 ;
摘要:
We investigate circular polarization in pulsar radio emission through simultaneous observations of PSR B1133+16 at two frequencies. In particular, we investigate the association of the handedness of circular polarization with the orthogonal polarization mode phenomenon at two different frequencies. We find the association to be significant across the pulse for PSR B1133+16, making a strong case for orthogonal polarization modes determining the observed circular polarization. The association however is not perfect and decreases with frequency. Based on these results and assuming emission occurs in superposed orthogonal polarization modes, we present a technique of mode decomposition based on single pulses. Average profiles of the polarization of each mode can then be computed by adding the individual mode-separated single pulses. We show that decomposing single pulses produces different average profiles for the orthogonal polarization modes from decomposing average profiles. Finally, we show sample single pulses and discuss the implications of the frequency dependence of the correlation of the circular polarization with the orthogonal polarization mode phenomenon.
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页码:325 / 332
页数:8
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