NGC 254 is a lenticular galaxy located in the constellation Sculptor. It was discovered by John Herschel in 1834.[4] It is in a galaxy group with NGC 134.[3]

NGC 254 is an example of a ring galaxy, a galaxy with a ring,[3] and in this case, no central bar. Across the entire galaxy disk, there is a disk of ionized gas rotating in the direction opposite the stellar disk's rotation.[3] This situation may have arose when a retrograde-orbiting satellite galaxy accreted onto the galaxy itself, some 1 billion years ago.[3]

See also

References

  1. ^ a b c d "NGC 254". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 12 February 2017.
  2. ^ a b c "NASA/IPAC Extragalactic Database". Results for NGC 254. Retrieved 2 September 2016.
  3. ^ a b c d e Katkov, Ivan Yu.; Kniazev, Alexei Yu.; Sil'Chenko, Olga K.; Gasymov, Damir (2022). "Star formation in outer rings of S0 galaxies. IV. NGC 254: A double-ringed S0 with gas counter-rotation". Astronomy & Astrophysics. 658: A154. arXiv:2112.03289. Bibcode:2022A&A...658A.154K. doi:10.1051/0004-6361/202141934. S2CID 245728982.
  4. ^ a b "New General Catalog Objects: NGC 250 - 299". cseligman.com. Retrieved 12 February 2017.
  • Media related to NGC 254 at Wikimedia Commons


Allikas: https://en.wikipedia.org/wiki/NGC_254
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