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Discovery of molecular hydrogen in a high-velocity cloud of the Galactic halo

de Boer, K. S.; Grewing, M.; Richter, P. +4 more

The Milky Way's halo contains clouds of neutral hydrogen with high radial velocities which do not follow the general rotational motion of the Galaxy. Few distances to these high-velocity clouds are known, so even gross properties such as total mass are hard to determine. As a consequence, there is no generally accepted theory regarding their origi…