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The hidden mass and large spatial extent of a post-starburst galaxy outflow

The hidden mass and large spatial extent of a post-starburst galaxy outflow

Publication date: 18 November 2011

Authors: Tripp, T.M., et al.

Journal: Science
Volume: 334
Issue: 6058
Page: 952-955
Year: 2011

Copyright: AAAS

Outflowing winds of multiphase plasma have been proposed to regulate the buildup of galaxies, but key aspects of these outflows have not been probed with observations. By using ultraviolet absorption spectroscopy, we show that 'warm-hot' plasma at 105.5 Kelvin contains 10 to 150 times more mass than the cold gas in a post-starburst galaxy wind. This wind extends to distances > 68 kiloparsecs, and at least some portion of it will escape. Moreover, the kinematical correlation of the cold and warm-hot phases indicates that the warm-hot plasma is related to the interaction of the cold matter with a hotter (unseen) phase at >>106 Kelvin. Such multiphase winds can remove substantial masses and alter the evolution of post-starburst galaxies.

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