Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/5514

Title

NGC 922 : a new drop-through ring galaxy

Author(s)

Wong, O.;  Meurer, Gerhardt R.;  Bekki, Kenji;  Hanish, D. J.;  Kennicutt, Robert C.;  Bland-Hawthorn, Jonathan;  Ryan-Weber, Emma V.;  Koribalski, Barbel S.;  Kilborn, Virginia A.;  Putman, Mary E.;  Heiner, Jonathan S.;  Webster, Rachel L.;  Allen, Ron J.;  Dopita, Michael A.;  Doyle, Marianne T.;  Drinkwater, Michael J.;  Ferguson, Henry C.;  Freeman, Kenneth C.;  Heckman, Timothy M.;  Hoopes, Charles G.;  Knezek, Patricia M.;  Meyer, Michael J.;  Oey, M. Sally;  Seibert, Mark;  Smith, R. Chris;  Staveley-Smith, Lister;  Thilker, David A.;  Werk, Jessica K.;  Zwaan, Martin A.

Abstract

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 Rubble Space Telescope images suggest they were more common in the early Universe.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing

Source

Monthly Notices of the Royal Astronomical Society, Vol. 370, no. 4 (2006), p. 1607-1611

Publication year

2006

Keyword(s)

Galaxies;  NGC 922;  Galaxy structure

Publisher

Blackwell Publishing

ISSN

0035-8711

Publisher URL

http://dx.doi.org/10.1111/j.1365-2966.2006.10589.x

Copyright

Copyright © 2006 Royal Astronomical Society.

Peer reviewed