期刊
ASTRONOMY & ASTROPHYSICS
卷 658, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202142330
关键词
magnetohydrodynamics (MHD); methods; analytical; galaxies; magnetic fields; techniques; interferometric; galaxies; jets
The study shows that the characteristic X-shaped magnetic field polarization in edge-on spiral galaxies can develop magnetohydromagnetically from an initial disk magnetic field combined with wind and rotation. The rotation measure develops a corresponding X distribution in sign.
Aims. Or aim in this note is to compare a recent explanation of the galactic X pattern in Faraday rotation to the pattern produced by the advection part of the classical dynamo. Methods. We find that the characteristic X magnetic field polarization in the plane of the sky, found in edge-on spiral galaxies, can develop magnetohydromagnetically from an initial disk magnetic field combined with wind and rotation. The rotation measure develops a corresponding X distribution in sign, but this distribution is not a universal behavior because it depends primarily on the velocity field. We use Cauchy evolution of an initial magnetic field to find the field at some later time. Results. A battery mechanism that requires the current to always flow out of a galaxy has been recently suggested. This contrasts with the conclusions of this paper. Conclusions. Either explanation has significant consequences for the structure of a spiral galaxy. If the battery mechanism applies, then we have a new method of producing a magnetic field independent of the traditional dynamo. If, however, the flow mechanism applies, then constraints concerning the presence and nature of a galactic wind, together with the signature of the mean radial magnetic field, can be inferred.
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