ring galaxy


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ring galaxy

A very rare type of galaxy that has the form of an elliptical ring either with a massive nucleus, often off-center, or with little or no luminous material visible in its interior. In many cases there is a small satellite galaxy devoid of interstellar gas. The ring configuration is thought to be unstable and it has been suggested that these systems may represent the after-effects of a collision between two galaxies.

ring galaxy

[′riŋ ‚gal·ik·sē]
(astronomy)
A class of galaxy whose ringlike structure has clumps of ionized hydrogen clouds on its periphery, may have a nucleus of stars, and is usually accompanied by a small galaxy; probably formed when a small galaxy crashes through the disk of a spiral galaxy.
References in periodicals archive ?
The newly discovered ring galaxy is seven times closer than anything similar found before, and forty times closer than the famous 'Cartwheel' galaxy.
Another ring galaxy to observe is NGC 6028 in Hercules.
The some 120 papers discuss such topics as the collisional ring galaxy NGC922, how gas stripping transforms the stellar populations of cluster spiral galaxies, the mass-to-light ratios of galactic globular clusters, shock-induced starburst and star cluster formation in colliding galaxies, ultraluminous X-ray sources in interacting galaxies, and star formation in the tidal debris of minor mergers.
Known as a barred spiral or prototype ring galaxy, it has faint arms connected to the east and west ends, swinging north to south, understandibly only visible in larger telescopes.
Lest anyone take the structure of a ring galaxy for granted.
The Sculptor constellation harbours a huge number of galaxies like the Cartwheel Ring Galaxy (ESO 350-G40) with a special appearance and a distance of around 500 000 light years.