NGC922 - A new drop-through ring galaxy

Details NGC922 - A new drop-through ring galaxy NGC922 - A new drop-through ring galaxy

2006-05-24

arxiv.org/abs/astro-ph/0605613v1

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.

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