Toward an empirical theory of pulsar emission. V. On the circular polarization in pulsar radiation

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168531· OSTI ID:6807110

Radhakrishnan, V; Rankin, J M ^[1]

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1. Raman Research Institute, Bangalore (India) Vermont Univ., Burlington (USA)

The circular polarization associated with pulsar emission is examined phenomenologically. Virtually all circular polarization is observed in core components - that is, in core-single profiles and in the central components of triple and five-component profiles. Two extreme types of circular signature are identified in the observations: (1) an antisymmetric type wherein the circular polarization changes sense in midpulse, and (2) a symmetric type wherein it is predominantly of one sense. It is found that circular polarization of the antisymmetric type is strongly correlated with the sense of rotation of the linear position angle. Transitions from positive (LH) to negative (RH) are found to accompany negative (clockwise) rotations of the position angle and vice versa. The correlation requires that the antisymmetric circular polarization is also a purely geometric property of the emission process. Curvature radiation will have significant net circular polarization if there are gradients in the emissivity over angular scales comparable with the emission cone of a single charge. Furthermore, no net circular polarization is produced if the emissivity is circularly symmetric about the magnetic dipole axis. 37 refs.

• OSTI ID: 6807110
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 352; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
COSMIC RADIO SOURCES
EMISSION SPECTRA
EMISSIVITY
MAGNETIC FIELDS
MOTION
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
POLARIZATION
PULSARS
ROTATION
SPECTRA
STELLAR ATMOSPHERES
STELLAR MAGNETOSPHERES
STELLAR RADIATION
SURFACE PROPERTIES