Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-25
Astronomy and Astrophysics
Astrophysics
7 pages, 1 figure; Invited review at the conference "How does the Galaxy work ?", Granada/Spain, June 2003
Scientific paper
Significant progress has been made over the last few years to explore the gaseous halo of the Milky Way by way of absorption spectroscopy. I review recent results on absorption line studies in the halo using various instruments, such as the Far Ultraviolet Spectroscopic Explorer, the Space Telescope Imaging Spectrograph, and others. The new studies imply that the infall of low-metallicity gas, the interaction with the Magellanic Clouds, and the Galactic Fountain are responsible for the phenomenon of the intermediate- and high-velocity clouds in the halo. New measurements of highly-ionized gas in the vicinity of the Milky Way indicate that these clouds are embedded in a corona of hot gas that extends deep into the intergalactic space.
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