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2nd of October 2015
Hydrogen in the galaxy ESO115-G023
by Bärbel Koribalski (CASS)
HI spectral line observations deliver large data cubes. One way to represent the information on the distribution and rotation of the neutral hydrogen (HI) emission in galaxies - shown here - is via moment maps. (Left) 0. moment = HI distribution, (middle) 1. moment = mean HI velocity field, and (right) 2. moment = mean HI velocity dispersion. - The edge-on galaxy ESO115-G023 and its newly discovered companion are part of the Local Volume HI Survey (LVHIS).

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