AM 0644-741

AM 0644-741, also known as the Lindsay-Shapley Ring, is an unbarred lenticular galaxy, and a ring galaxy, which is 300 million light-years away in the southern constellation Volans.

AM 0644-741
AM 0644-741, as taken by the HST. Courtesy of NASA/ESA
Observation data (J2000 epoch)
ConstellationVolans
Right ascension6h 43m 6.1s[1]
Declination−74° 13′ 35″[1]
Redshift6604 ± 26 km/s[1]
Distance300 Mly
Apparent magnitude (V)13.96[1]
Characteristics
Type(S0-) + Ring[1]
Apparent size (V)1′.7[1]
Other designations
Southern Ellipse,[1] PGC 19481, AM 0644-741, ESO 34-11, VV 785, IRAS 06443-7411, SGC 064425-7411.1

Properties

Formation

The yellowish nucleus was once the center of a normal spiral galaxy, and the ring which currently surrounds the center is 150,000 light years in diameter.[2] The ring is theorized to have formed by a collision with another galaxy, which triggered a gravitational disruption that caused dust in the galaxy to condense and form stars, which forced it to then expand away from the galaxy and create a ring.

Physical Characteristics.

The ring is a region of rampant star formation dominated by young, massive, hot blue stars. The pink regions along the ring are rarefied clouds of glowing hydrogen gas that is fluorescing as it is bombarded with strong ultraviolet light from the blue stars.

Future of the Ring

Galactic simulation models suggest that the ring of AM 0644-741 will continue to expand for about another 300 million years, after which it will begin to disintegrate.[3]

References
  1. "Nasa/Ipac Extragalactic Database". Results for AM 0644-741. Retrieved 2006-10-12.
  2. Nemiroff, R.; Bonnell, J., eds. (April 19, 2015). "Ring Galaxy AM 0644-741 from Hubble". Astronomy Picture of the Day. NASA.
  3. "The Lure of the Rings". News Release Number: STScI-2004-15. HubbleSite. April 22, 2004. Retrieved March 31, 2012.
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