NGC 5291

NGC 5291 is a ring galaxy located approximately 200 million light-years away in the constellation Centaurus. It is notable for its unusual structure and tidal features, thought to be the result of a galactic collision approximately 360 million years ago. This collision involved NGC 5291 and another galaxy, leading to the disruption of the original structure and the formation of the observed ring.

The ring structure is composed of gas and dust, along with a significant amount of star formation. This star formation is triggered by the compression of gas and dust caused by the gravitational interactions of the collision. The surrounding region is filled with debris, including tidal tails and dwarf galaxies, further evidence of the violent interaction.

NGC 5291 is of interest to astronomers studying galaxy evolution and the effects of galactic collisions. The system provides a valuable opportunity to observe the processes that occur during and after such events, including the formation of new stars and the redistribution of gas and dust. Its proximity and relatively bright nature have allowed for detailed studies of its composition, structure, and kinematics. Studies of the "Seashell" feature within NGC 5291 have revealed the presence of extremely metal-poor gas clouds, a rarity in such environments, providing insights into the pre-enriched state of galactic gas.