Intermediate Temperature Gas in Spiral Galaxies as Seen through OVI Emission

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Interstellar matter at temperatures of a few times 100,000 K is best studied through the lithium-like ions of CIV, NV, and OVI. These transitions trace gas that links the hot with the warm phase of the interstellar medium through processes such as radiative cooling or turbulent mixing. Absorption line studies of this intermediate temperature gas have brought us a wealth of information, mostly about the Milky Way and the Magellanic Clouds. Exploring this gas phase in other galaxies usually requires emission line observations. They can also be a powerful analysis tool for the gas in the Milky Way, especially when combined with absorption line studies. Emission line observations, however, are still technically challenging today due to the low intensities in these lines. I will present an overview over OVI emission observations to date in spiral galaxies, including the Milky Way, and their implications for the disk-halo interactions in these galaxies.

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