Polarisation detection at radio wavelengths in three spiral galaxies

Details Polarisation detection at radio wavelengths in three spiral galaxies Polarisation detection at radio wavelengths in three spiral galaxies

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.264..222s&link_type=abstract

Nature, vol. 264, Nov. 18, 1976, p. 222-226. Research supported by the Nederlandse Organisatie voor Zuiver-Wetenschappelijk Onde

Physics

65

Galactic Radio Waves, Magnetic Fields, Polarized Electromagnetic Radiation, Spiral Galaxies, Andromeda Galaxy, Magnetic Flux, Radiant Flux Density

Scientific paper

Polarization at radio wavelengths has been measured in the disk radiation from M51, M81, and M31 using the Westerbork Synthesis Radio Telescope. The magnetic field of M51, as implied by the polarization-vector map, is oriented preferentially in the tangential direction. The intrinsic polarization of the disk radiation from M51 is estimated to be, on average, 12%, corresponding to an anisotropy (or degree of uniformity) in the magnetic field of 14% with a scale length not exceeding 3 kpc. A 7% lower limit is set on the polarized disk radiation from M81, but in some parts of the disk of M31 it reaches 20%.

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