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12th of November 2015
HI tidal tails, bridges and clouds
by Bärbel Koribalski (CASS)
Neutral hydrogen gas (HI) is abundant in most galaxies, but it is also found well outside their stellar envelopes where it contributes to the intergalactic medium. Prominent nearby examples of intergalactic gas include the Magellanic Stream and extended HI bridges in the M 81 group of galaxies. The HI distribution towards the peculiar spiral galaxy NGC 3263 (shown above) reveals a spectacular HI cloud about 175 x 100 kpc in size with an HI mass of ~109 Msun. For a full description see the paper by English, Koribalski et al. 2010. - We are currently writing a review paper on "HI tidal tails, bridges and clouds".

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