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7th of June 2015
Galaxy pair with huge tidal tails
by Bärbel Koribalski (CASS)
The hydroden distribution and velocity field of the merging galaxy pair NGC 4038/9, also known as `The Antennae'. The radio data were taken with CSIRO's Australia Telescope Compact Array; the small inset shows the HST image of the two merging galaxy disks to scale. The tidal tails - shaped like the antennae of an insect - were produced by gravitational interactions between the two gas-rich spiral galaxies, NGC 4038 and NGC 4039, which lost a large fraction of their hydrogen disks in the process. The small companion seen at the bottom right of both images is the edge-on dwarf galaxy ESO 572-G045.

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