The radio halo of NGC 4631: Ordered magnetic fields far above the plane

Details The radio halo of NGC 4631: Ordered magnetic fields far above the plane The radio halo of NGC 4631: Ordered magnetic fields far above the plane

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...197l..29h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 197, no. 1-2, May 1988, p. L29-L31.

Astronomy and Astrophysics

Astrophysics

78

Continuous Radiation, Halos, Interstellar Magnetic Fields, Linear Polarization, Radio Emission, Spiral Galaxies, Morphology, Relativistic Electron Beams, Star Formation, Synchrotron Radiation

Scientific paper

In this letter, the discovery of linearly polarized emission in the radio halo of the edge-on spiral galaxy NGC 4631 is reported. At a distance of 6.5 kpc above the plane of the galaxy the radio emission at 1.49 GHz is 10 to 30 percent polarized, implying the existence of a very well ordered magnetic field. The observations suggest that the excessive thickness of the radio halo of NGC 4631, when compared to other edge-on galaxies, is due to the gravitational interaction between NGC 4631 and its companions.

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