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          Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents



ID: 125470.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
Polarization position angle swings caused by relativistic effects
Authors:Qian, S. J.; Zhang, X. Z.
Language:English
Date of Publication (YYYY-MM-DD):2003-02
Title of Journal:Chinese Journal of Astronomy and Astrophysics
Journal Abbrev.:Chin. J. Astron. Astrophys.
Volume:3
Issue / Number:1
Start Page:75
End Page:86
Review Status:Internal review
Audience:Experts Only
Abstract / Description:Polarization position angle swings of similar to 180degrees observed in extragalactic radio sources are a regular behavior of variability in polarization. They should be due to some kind of physically regular process. We consider relativistic shocks which propagate through and 'illuminate' regular configurations of magnetic field, producing polarization angle swing events. Two magnetic field configurations (force-free field and homogeneous helical field) are considered to demonstrate the results. It is shown that the properties of polarization angle swings and the relationship between the swings and variations in total and polarized flux density are critically dependent on the configuration of magnetic field and the dynamical behavior of the shock. In particular, we find that in some cases polarization angle swings can occur when the total and polarized flux densities only vary by a very small amount. These results may be useful for understanding the polarization variability with both long and short timescales observed in extragalactic radio sources.
Free Keywords:radio continuum : galaxies, polarization, galaxies : magnetic fields
Comment of the Author/Creator:Date: 2003, FEB
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Radioastronomie
External Affiliations:Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China.; Max Planck Inst Radioastron, D-5300 Bonn, Germany.
Identifiers:ISI:000181239600007 [ID No:1]
ISSN:1009-9271 [ID No:2]
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