NGC 5253
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NGC 5253 is an irregular galaxy in the constellation Centaurus. It was discovered by William Herschel on 15 March 1787.[1][2]
Properties
NGC 5253 is located within the M83 Subgroup of the Centaurus A/M83 Group, a relatively nearby galaxy group that includes the radio galaxy Centaurus A and the spiral galaxy M83 (the Southern Pinwheel Galaxy). NGC 5253 is considered a dwarf starburst galaxy[3] and also a blue compact galaxy.[4]
Supernovae
Two supernovae have been observed in NGC 5253:
- SN 1895B (type unknown, mag. 8) was discovered by Williamina Fleming on 7 July 1895.[5][6][7]
- SN 1972E (type Ia, mag. 8.5),[8] the second-brightest recent supernova visible from Earth, was discovered by Charles Kowal on 6 May 1972. With a peak apparent magnitude of 8.5, the only brighter supernova observed in the 20th century was SN 1987A.[9][10]
Contents
NGC 5253 contains a giant dust cloud hiding a cluster (believed to be a super star cluster) of more than one million stars, among them up to 7,000 O-type stars. The cluster is 3 million years old and has a total luminosity of more than one billion suns. It is the site of efficient star formation, with a rate at least 10 times higher than comparable regions in the Milky Way.[11][12]
Image gallery
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NGC 5253 imaged by the Hubble Space Telescope
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The nucleus of NGC 5253 imaged by the Hubble Space Telescope
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References
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- ↑ The scientific papers of Sir William Herschel by J. L. E. Dreyer. Royal Astronomical Society London 1912.
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External links
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