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Linearly Polarised Radio Emission from M83 (NGC 5236) and NGC 891

Published online by Cambridge University Press:  19 July 2016

S. Sukumar  and
R.J. Allen
S. Sukumar
Affiliation:
1Department of Astronomy, University of Illinois, Urbana, IL 61801, USA
R.J. Allen
Affiliation:
1Department of Astronomy, University of Illinois, Urbana, IL 61801, USA 2National Center for Supercomputing Applications, University of Illinois, Urbana, IL 61801, USA

Abstract

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Recent VLA 20 cm radio continuum observations of the southern face-on barred spiral M83 reveal that the magnetic field is very highly aligned at the outer regions (~12 kpc radius) and totally disrupted in the inner regions (<6 kpc) of the galaxy. The RM variation suggests an axisymmetric morphology for the magnetic field. VLA 6 cm continuum polarization observations of the edge-on spiral NGC 891 reveal ordered magnetic fields at large Z-distances (~3 kpc) from the galactic plane, probably emanating from the disk through instabilities.

Type
5. The Polarization, Magnetic Field and Velocity Structure of External Spiral Galaxies
Information
Symposium - International Astronomical Union , Volume 140: Galactic and Intergalactic Magnetic Fields , 1990 , pp. 215 - 218
Copyright
Copyright © Kluwer 1990 

References

Sukumar, S., Klein, U., and Gräve, R. (1987) ‘Multi-frequency radio continuum observations of NGC 5236 (M83)’, Astron. Astrophys. 184, 71–78.Google Scholar
Sukumar, S. and Allen, R.J. (1989) ‘Large-scale magnetic-field structure in the spiral galaxy M83’, Nature, 340, 537–539.CrossRefGoogle Scholar
Sukumar, S., Allen, R.J., and Klein, U. (1990) ‘Axisymmetric magnetic field structure of M83’, Astron. Astrophys. submitted.Google Scholar