NGC922 - A new drop-through ring galaxy

Abstract

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.

5 pages, accepted for publication in MNRAS Letters

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Cited by in corpus (23)

• HST morphologies of local Lyman break galaxy analogs I: Evidence for starbursts triggered by merging
• Rings and Bent Chain Galaxies in the GEMS and GOOD Fields
• Morphology and enhanced star formation in a Cartwheel-like ring galaxy
• Ring Galaxies in the EAGLE Hydrodynamical Simulations
• The Star Cluster Population of the Collisional Ring Galaxy NGC 922
• Formation of the off-center bar in the Large Magellanic Cloud: A collision with a dark satellite ?
• The host galaxy of GRB 980425 / SN1998bw: a collisional ring galaxy
• A giant umbrella-like stellar stream around the tidal ring galaxy NGC 922
• The X-Ray Luminosity Function of Ultra Luminous X-Ray Sources in Collisional Ring Galaxies
• Propagating Star Formation in the Collisional Ring Galaxy Arp 10
• Metallicity and X-ray luminosity variations in NGC 922
• Ionized and neutral gas in the peculiar star/cluster complex in NGC 6946
• Astrophysics in 2006
• On the Formation of Elliptical Rings in Disk Galaxies
• An HI study of the collisional ring galaxy NGC 922
• HI asymmetry in the isolated galaxy CIG 85 (UGC 1547)
• Discovery of a near-infrared bar and a pseudobulge in the collisional ring galaxy Cartwheel
• Chandra Observations of the Collisional Ring Galaxy NGC 922
• Stellar tidal streams around nearby spiral galaxies with deep imaging from amateur telescopes
• Early Science with the Large Millimeter Telescope: discovery of the 12CO(1-0) emission line in the ring galaxy, VIIZw466
• Formation of collisional ring galaxies in Milgromian dynamics
• Massive star clusters and clumps in the collisional ring galaxy Arp 147
• Young Stellar Populations in the Collisional Ring Galaxy NGC 922