Collisions of high-velocity clouds with the Milky Way - The formation and evolution of large-scale structures

Details Collisions of high-velocity clouds with the Milky Way - The formation and evolution of large-scale structures Collisions of high-velocity clouds with the Milky Way - The formation and evolution of large-scale structures

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...179..219t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 179, no. 1-2, June 1987, p. 219-230.

Astronomy and Astrophysics

Astrophysics

95

Astrophysics, Galactic Structure, Interstellar Gas, Milky Way Galaxy

Scientific paper

Full two-dimensional hydrodynamic calculations of the collisions of high velocity clouds with the Milky Way are presented. Based on the properties of the gaseous galactic disk and those of high velocity clouds, three stratified regions of the disk, representative of the conditions at 5 kpc, 10 kpc, and 20 kpc from the galactic center, are set as targets for the impinging clouds. The calculations show the build-up of massive structures, several hundred parsecs across, able to retain for a significant time (t very large collision time) a significant fraction of the kinetic energy released during impact. The evolution of such remnants, before and after crossing the galactic plane, is also approximated by general analytical relations and compared with the observations. Also, general trends resulting from the exploration of the parameter space are given which support the hypothesis that the mechanism of cloud-galaxy interactions may be responsible for some of the most energetic structures in the galaxy, such as supershells.

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