Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-02-09
Astronomy and Astrophysics
Astrophysics
11 pages, 4 Figs, Talk at the JENAM, May 29 -- June 3, 2000, Moscow
Scientific paper
10.1080/10556790108229704
We briefly discuss a possible interconnection of vertical HI structures observed in the Milky Way Galaxy with large scale blow-outs caused by the explosions of multiple clustered SNe. We argue that the observed OB associations can produce only about 60 such events, or approximately one chimney per 3 kpc$^2$ within the solar circle. We also discuss the overall properties of HI shells in nearby face-on galaxies and the distribution of H$\alpha$ and dust in edge-on galaxies. We argue that the presence of dust in galactic haloes may indicate that radiation pressure is the most probable mechanism capable of transporting dust to large heights above the galactic plane. In order to make this possible, the galactic magnetic field must have a strong vertical component. We mention that SNe explosions can initiate the Parker instability which in turn creates large scale magnetic loops with a strong vertical component. Recent observations of nearby edge-on galaxies favour this suggestion.
Dettmar Ralf-Juergen
Schroeer A.
Shchekinov Yu A.
Steinacker Adriane
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