galactic fountain

galactic fountain

Hot X-ray emitting gas from groups of supernova remnants that breaks free of the plane of our Galaxy and expands away until it cools and falls back onto the disk in a fountainlike behavior.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
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If instead the wind velocity is not high enough, the gravitational pull eventually prevails and a galactic fountain is formed instead.
While some of their properties suggest that they could account for the infalling material we are talking about, others indicate that they are related to "galactic fountain" processes.
Instead of blocking diffuse X-ray emissions, the Draco cloud may just happen to lie in front of a "galactic fountain" -- a hot, X-ray-emitting gas spewing into a small portion of the Milky Way's halo.
Their ejecta blast through the interstellar medium, heating it and giving rise to phenomena such as galactic fountains. Shock waves from supernovae may also trigger vigorous bursts of star formation by compressing dense molecular clouds.
This instrument is most sensitive to diffuse ionized gas at temperatures of several hundred thousand degrees, and so it has the potential to map galactic fountains if they exist.