Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pasj...52..175k&link_type=abstract
Publications of the Astronomical Society of Japan, v.52, p.175.
Astronomy and Astrophysics
Astronomy
2
Galaxies: Formation, Hydrodynamics, Ism: Clouds, Ism: General, Ism: Structure
Scientific paper
Within the framework of the two-component protogalaxy model, the components of which are dense cold clouds and diffuse coronal gas, we discuss the stability condition of the dense clouds against the Kelvin-Helmholtz instability (KHI). Interestingly, the stability condition of the clouds against KHI determines the global properties of the protogalaxies. Especially, in this paper, the effect of the magnetic field against KHI is examined. The author hypothesizes the two-component mixture to be magnetized. It is known that when the relative speed between two contacting fluids is smaller than the Alfvén speed, it is possible for KHI to be suppressed due to the magnetic field. Obviously, the efficiency of stabilization against KHI by this effect is related to the global property of the two-component protogalaxies. Hence, we find that the two-component model of the protogalaxy is compatible with the scenario of galaxy formation via a magnetic field.
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