Double Faraday rotation toward 3C 27

Details Double Faraday rotation toward 3C 27 Double Faraday rotation toward 3C 27

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...283..540g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 15, 1984, p. 540-545.

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7

Faraday Effect, Interstellar Magnetic Fields, Polarization Characteristics, Polarized Electromagnetic Radiation, Radio Galaxies, Astronomical Models, Linear Polarization, Magnetic Dipoles, Milky Way Galaxy, Radiant Flux Density

Scientific paper

From observations of the integrated flux of 3C 27 with the NRAO 140 foot (43 m) telescope at 40 frequencies between 1250 and 1445 MHz, the authors deduce rotation measures of 165±15 and -104±4 rad m-2. Since the source (assumed to be a radio galaxy) has components 45arcsec apart, it is concluded that the net magnetic field reverses between these directions. One explanation is that a large magnetic field surrounding the central galaxy of the distant source covers one component but not the other. Another explanation is that our Galaxy contains a dipole field with a scale of order 1 pc. One component of the distant source is seen inside the current loop associated with the dipole field, while the other is seen outside the loop.

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