Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.187..187b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 187, Apr. 1979, p. 187-200.
Astronomy and Astrophysics
Astronomy
63
Linear Polarization, Microwave Emission, Plasma Jets, Radio Astronomy, Radio Galaxies, Astronomical Maps, Brightness Temperature, Electron Density (Concentration), Magnetic Fields, Radiant Flux Density
Scientific paper
High-resolution polarization observations of the large radio galaxy 3C 31 have been made at 1.4 and 2.7 GHz. The straight and resolved sections of both radio jets are found to contain well-ordered magnetic fields aligned perpendicular to the jet axes and thermal electron densities of the order of 10,000 per cu m. The perpendicular field and the distribution of emission across the jets imply that the predominant radio emission is not coming from the interfaces between the jets and some external medium, as might be expected if the jets are confined by such a medium. However, a simple model of a 'free' jet (one not confined in this way) is also ruled out since the brightness of each jet decreases only slowly with distance from the central galaxy. Reacceleration of relativistic electrons is therefore probably occurring along each jet; this could perhaps be caused by shock fronts within the jets.
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