|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).