Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289...94b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 1, p. 94-100
Astronomy and Astrophysics
Astrophysics
34
Dynamo Theory, Galactic Evolution, Galactic Rotation, Interstellar Magnetic Fields, Magnetohydrodynamics, Spiral Galaxies, Angular Velocity, Deposition, Fluid Flow, Gas Density, Magnetic Field Configurations, Turbulence
Scientific paper
We discuss the generation of a regular magnetic field in an evolving spiral galaxy, starting at early stages immediately after the formation of the galactic gas disc. Our study is motivated by a recent claim of the detection of a strong (greater than or approximately = 1, micro-G) regular magnetic field in very young galactic discs. It is shown that hydrodynamic dynamo can produce a regular magnetic field of this strength at early stages of galactic evolution within a period of about 109 yr. The seed magnetic field compatible with this possibility can be the chaotic field generated by the turbulent motions in the (proto)galaxy. Among various effects of galactic evolution which are important for the mean-field dynamos, the decrease with time of the gas disc thickness is singled out as plausibly the most significant one.
Beck Rainer
Poezd A. D.
Shukurov Anvar
Sokoloff Dimitry
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