Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...314..927s&link_type=abstract
Astronomy and Astrophysics, v.314, p.927-939
Astronomy and Astrophysics
Astrophysics
6
Galaxy: Halo Of, Ism: Clouds, Ism: Kinematics And Dynamics, Shock Waves
Scientific paper
Using a simplified model of the interaction of shock waves with interstellar clouds, the injection of material from the Galactic disk into the halo is described. Type Ia supernovae, with a scale height similar to that of the population II starlight, are assumed to be the powerfull source which forces interstellar clouds to raise to large distances from the Galactic plane. It is shown that clouds with a moderate-to-low velocity dispersion follow the vertical distribution of type I supernovae, and therefore can form a distribution similar to the Lockman HI disk. Clustered type II supernovae are argued to support gas in the halo at considerably larger distances from the disk (up to several kpc), and thus can be the source of the extended halo gas traced by highly ionized species (SiIV, CIV and NV). The relevant efficiency of the mass injection from the disk into the halo by SNe of type I and II is in a reasonable agreement with the inflow mass rate in high-velocity HI clouds inferred from observations.
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