Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-24
Mon.Not.Roy.Astron.Soc.370:1607-1611,2006
Astronomy and Astrophysics
Astrophysics
5 pages, accepted for publication in MNRAS Letters
Scientific paper
10.1111/j.1365-2966.2006.10589.x
We have found the peculiar galaxy NGC922 to be a new drop-through ring galaxy using multi-wavelength (UV-radio) imaging and spectroscopic observations. Its `C'-shaped morphology and tidal plume indicate a recent strong interaction with its companion which was identified with these observations. Using numerical simulations we demonstrate that the main properties of the system can be generated by a high-speed off-axis drop-through collision of a small galaxy with a larger disk system, thus making NGC922 one of the nearest known collisional ring galaxies. While these systems are rare in the local Universe, recent deep HST images suggest they were more common in the early Universe.
Allen Rosalind J.
Bekki Kenji
Bland-Hawthorn Jonathan
Dopita Mike A.
Doyle Marianne T.
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