AM 0644-741

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AM 0644-741
AM 0644-741.jpg
AM 0644-741, as taken by the HST. Courtesy of NASA/ESA
Observation data (J2000 epoch)
Constellation Volans
Right ascension 6h 43m 6.1s[1]
Declination −74° 13′ 35″[1]
Redshift 6604 ± 26 km/s[1]
Distance 300 Mly
Type (S0-) + Ring[1]
Apparent dimensions (V) 1′.7[1]
Apparent magnitude (V) +13.96[1]
Other designations
Southern Ellipse,[1] PGC 19481, AM 0644-741, ESO 34-11, VV 785, IRAS 06443-7411, SGC 064425-7411.1
See also: Galaxy, List of galaxies

AM 0644-741 is an unbarred lenticular galaxy, and a ring galaxy, which is 300 million light-years away in the direction of the southern constellation Volans. The yellowish nucleus was once the center of a normal spiral galaxy, and the ring which currently surrounds the center is 150,000 light-year 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. 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. 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]


  1. ^ a b c d e f g "Nasa/Ipac Extragalactic Database". Results for AM 0644-741. Retrieved 2006-10-12. 
  2. ^ "Ring Galaxy AM 0644-741 from Hubble". Astronomy Picture of the Day. April 19, 2015. 
  3. ^ "The Lure of the Rings". News Release Number: STScI-2004-15. HubbleSite. April 22, 2004. Retrieved March 31, 2012.