Structure of the magnetic field in the radio jets in 3C 31 and NGC 315

Details Structure of the magnetic field in the radio jets in 3C 31 and NGC 315 Structure of the magnetic field in the radio jets in 3C 31 and NGC 315

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237..418f&link_type=abstract

Astrophysical Journal, Part 1, vol. 237, Apr. 15, 1980, p. 418-423. Research supported by the Natural Sciences and Engineering

Astronomy and Astrophysics

Astronomy

105

Astronomical Maps, Linear Polarization, Magnetic Field Configurations, Radio Galaxies, Radio Jets (Astronomy), Astronomical Models, Brightness Temperature, Contours, Extragalactic Radio Sources

Scientific paper

The VLA has been used to map the distributions of the total and linearly polarized radio brightness over the inner parts of the jets in the radio galaxies 3C 31 and NGC 315. In each galaxy it is found that the jet on one side of the nuclear radio core has a bright base within which the organized component of the magnetic field lies predominantly parallel to the jet for several kiloparsecs. Farther from the cores, as the jets widen, their magnetic fields become predominantly perpendicular to the jet axes, and the jets become more symmetric in intensity. These changes in magnetic-field direction are consistent with some classes of continuous-beam models for energy transport in extragalactic radio sources. The details of the polarization distributions can be fitted to a model wherein the ordered magnetic-field components in the beams have helical configurations whose pitch angles increase with distance from the radio cores.

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