The Origin of the High-Velocity Clouds

Details The Origin of the High-Velocity Clouds The Origin of the High-Velocity Clouds

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004assl..312..341b&link_type=abstract

High Velocity Clouds. Edited by Hugo van Woerden, Kapteyn Institute, Groningen, The Netherlands; Bart P. Wakker, University of W

Astronomy and Astrophysics

Astrophysics

5

Scientific paper

There are three leading models for the origin of the high-velocity clouds of neutral hydrogen: galactic fountains, material lost from dwarf galaxies, and the ancient remnants of galaxy formation. The tidal-stripping picture has strong observational support in that the Magellanic Stream is connected to the Magellanic Clouds and such phenomena are seen in other galaxy groups. Also, absorption in at least two sightlines through the Stream shows approximately the metallicity expected for Magellanic Cloud material. The Magellanic Clouds dominate the H i content of the ensemble of smaller galaxies in the Local Group. So, although other Local Group dwarf galaxies may have had their neutral gas removed, it would be a minor component compared to that of the Magellanic Stream. One unsolved issue in this area is whether the presence of other high-velocity gas complexes could be due to gas stripped in previous orbits of the Clouds past the Milky Way.

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