Effects of interstellar magnetic bubbles and of galactic tides on galactic magnetic fields

Details Effects of interstellar magnetic bubbles and of galactic tides on galactic magnetic fields Effects of interstellar magnetic bubbles and of galactic tides on galactic magnetic fields

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...136..373v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 136, no. 2, July 1984, p. 373-377.

Astronomy and Astrophysics

Astrophysics

37

Galactic Structure, Interstellar Magnetic Fields, Milky Way Galaxy, Spiral Galaxies, Tides, Linear Polarization, Magnetic Field Configurations, Quasars, Rotation

Scientific paper

For our Milky Way galaxy, a quantitative estimate is made of the apparent effects of four large interstellar magnetic bubbles near the Sun on the rotation measures of distant radio sources. For other spiral galaxies, a quantitative estimate is made of the apparent correlation found earlier by Vallée (1983) between observed magnetic field distributions and nearby companions. In Spi-Spi galaxies (e.g., with spiral stellar arms and a spiral magnetic field distribution), the tidal radius averages about 50 kpc, so large tidal effects from a companion galaxy could possibly create material arms and align stars, gas and magnetic fields in spiral arms. In Spi-Cir galaxies (e.g., with spiral stellar arms and a circumferential magnetic field distribution), the tidal radius is larger than about 100 kpc, so small tidal effects from a companion galaxy could only possibly excite density-wave arms, i.e. stars in spiral arms but gas and magnetic fields in circumferential orbits.

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