Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...353..108b&link_type=abstract
Astronomy and Astrophysics, v.353, p.108-116 (2000)
Astronomy and Astrophysics
Astrophysics
11
Galaxies: Magnetic Fields, Galaxies: Intergalactic Medium, Galaxies: Dwarf, Galaxies: Starburst, Instabilities, Plasmas
Scientific paper
Superwinds of primeval dwarf galaxies seem to play an important role in the early magnetization of the intergalactic medium. Realistic estimates of the ``ultimate'', post-outflow diffuse intergalactic magnetic field strengths cannot be made with simple flux conservation arguments. Rather one has to consider dynamical field regeneration mechanisms. Furthermore the role of the neutral component of the superwind outflow gas needs to be taken into account since local-universe outflow winds are known to be only partially ionized. Kelvin-Helmholtz instabilities are one plausible candidate for the amplification of magnetic flux expelled from the starbursting primeval galaxies. We examine solutions of the analytically derived generalized dispersion relation that is valid for partially ionized plasmas. Our calculations indicate that Kelvin-Helmholtz modes can operate fast enough to amplify the magnetic field strengths in superwinds within the timescale of the outflow. Plasma-neutral gas simulations show that the non-linear evolution of the Kelvin-Helmholtz modes resemble the pure MHD one and corroborate the idea that the coupling of the neutral and ionized components is sufficient to convert the free energy supplied by the superwinds to magnetic field energy. We argue that further amplification can be expected due to the development of smaller vortices and sharper magnetic field gradients during the continuous injection of magnetic flux.
Birk Guido Thorsten
Kronberg Philipp P.
Lesch Harald
Wiechen Heinz
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