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NGC922 - A new drop-through ring galaxy

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arxiv astro-ph/0605613 v1 pith:74RAVJIL submitted 2006-05-24 astro-ph

O. I. Wong , G. R. Meurer , K. Bekki , D. J. Hanish , R. C. Kennicutt , J. Bland-Hawthorn , E. V. Ryan-Weber , B. Koribalski
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V. A. Kilborn M. E. Putman J. S. Heiner R. L. Webster R. J. Allen M. A. Dopita M. T. Doyle M. J. Drinkwater H. C. Ferguson K. C. Freeman T. M. Heckman C. Hoopes P. M. Knezek M. J. Meyer M. S. Oey M. Seibert R. C. Smith L. Staveley-Smith D. Thilker J. Werk M. A. Zwaan
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keywords galaxydrop-throughngc922ringobservationsrecentsystemuniverse
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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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