NGC 922 - a new drop-through ring galaxy

O.I. Wong, Gerhardt Meurer, Kenji Bekki, D.J. Hanish, R.C. Kennicutt, J. Bland-Hawthorn, E.V. Ryan-Weber, B. Koribalski, 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. HoopesP.M. Knezek, Martin Meyer, M.S. Oey, M. Seibert, R.C. Smith, Lister Staveley-Smith, D. Thilker, J. Werk, M.A. Zwaan

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)


    We have found the peculiar galaxy NGC 922 to be a new drop-through ring galaxy using multiwavelength (ultraviolet-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 disc system, thus making NGC 922 one of the nearest known collisional ring galaxies. While these systems are rare in the local Universe, recent deep Hubble Space Telescope images suggest they were more common in the early Universe.
    Original languageEnglish
    Pages (from-to)1607-1611
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number4
    Publication statusPublished - 2006


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