Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ap%26ss..55...49e&link_type=abstract
Astrophysics and Space Science, vol. 55, no. 1, May 1978, p. 49-57.
Astronomy and Astrophysics
Astrophysics
14
Galactic Structure, Interstellar Magnetic Fields, Magnetic Field Configurations, Optical Polarization, Polarized Light, Astronomical Photography, Galactic Nuclei, Milky Way Galaxy, Peculiar Galaxies, Spiral Galaxies
Scientific paper
Polarimetric data are examined for about 15 spiral galaxies, and the magnetic fields revealed by the observation of optical polarization in these galaxies are discussed. The spirals observed include NGC 4216 as well as the peculiar galaxies NGC 3718 and 2685. It is found that: (1) light transmitted through the dust clouds of the dark lane in the spiral structure to the east of the nucleus in NGC 4216 is polarized with the strongest electric vector along the dark band, indicating large-scale magnetic fields in the direction of the spiral arms; (2) light is rather strongly polarized in the dark band believed to pass through the nucleus of NGC 3718; and (3) polarization effects caused by selective absorption are detected in the dark bands crossing over the NE part of the main body of NGC 2685, indicating the presence of magnetic fields along the observed filaments. These results show that the galaxies studied seem to possess large-scale magnetic fields along the spiral arms similar to the fields indicated in the Milky Way by the observed interstellar polarization of starlight. Some edge-on galaxies exhibiting polarization parallel to their dark bands are identified.
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