Polarized radio emission from the edge-on spiral galaxies NGC 891 and NGC 4565

Details Polarized radio emission from the edge-on spiral galaxies NGC 891 and NGC 4565 Polarized radio emission from the edge-on spiral galaxies NGC 891 and NGC 4565

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382..100s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 382, Nov. 20, 1991, p. 100-107. Research supported by University of Illinoi

Astronomy and Astrophysics

Astrophysics

72

Polarized Radiation, Radio Emission, Spiral Galaxies, Astronomical Polarimetry, Faraday Effect, Interstellar Matter, Linear Polarization, Three Dimensional Models, Very Large Array (Vla)

Scientific paper

Results are presented, at a resolution of 20 arcsec, of observations of the distribution of radio continuum intensity and linear polarization with the VLA in two nearby edge-on spiral galaxies, NGC 891 and NGC 4565, at 6 and 20 cm, respectively. A unified model is presented to account for the main features of the radio polarization in these two galaxies. The model geometry is determined from recent observations of face-on galaxies where the polarized emission is found to be strongest in the dark inter-arm and outer parts of the disks. A substantial Z-thickness is ascribed to this polarized emission. It is shown that the exceptionally strong wavelength dependence of this type of Faraday depolarization can result in edge-on galaxies becoming rapidly 'Faraday thick' at decimeter wavelengths, thereby obliterating the polarization from regions on the dark side of the disk. The degree of polarization observed in both galaxies increases strongly with increasing Z-distance from the plane.

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