Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95..750v&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 95, March 1988, p. 750-754.
Astronomy and Astrophysics
Astronomy
25
Circular Orbits, Interstellar Magnetic Fields, Milky Way Galaxy, Orion Constellation, Sagittarius Constellation, Spiral Galaxies, Galactic Nuclei, H Ii Regions, Pitch (Inclination), Pulsars, Quasars, Radio Waves
Scientific paper
For the Sagittarius, Orion, and Perseus spiral arms, the pitch angle (i.e., deviation from a tangent parallel to a circular orbit around the center of the Galaxy) of the magnetic field lines differ from the pitch angle of the spiral arms. For the spiral arms, the pitch angle of the magnetic field lines can be measured independently from both quasars and galaxies as well as from pulsars, yielding a small (-6°) pitch angle, as predicted in the roughly circular oval gas streamline model of the density-wave theory. Meanwhile, the pitch angle of the spiral arms can be measured independently from both the O type stars and from the H II regions, yielding a large (-18°) pitch angle, also as predicted in the density-wave theory. Thus for these arms, the magnetic field lines cross the spiral arms, to leave them outwardly at a sizable mean angle (+12°).
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