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NGC 23 is a spiral galaxy located in the northern constellation of Pegasus, around 173.5 megalight-years distant from the Milky Way.[3] It was discovered by William Herschel on 10 September 1784. In the Webb Society Deep-Sky Observer's Handbook,[6] the visual appearance of NGC 23 is described as follows:

Bright, extended ellipse; a bright nuclear structure is noticeably elongated; two weak spiral enhancements emerge from opposite sides of the nucleus, one curving towards a bright star attached on the south end. The galaxy is likely interacting with NGC 9.

NGC 23
NGC 23 by HST
Observation data (J 2000.0 epoch)
ConstellationPegasus
Right ascension00h 09m 53.411s[1]
Declination+25° 55′ 25.46″[1]
Redshift0.015231[2]
Helio radial velocity4,568 km/s[3]
Distance173.5 Mly (53.21 Mpc)[3]
Apparent magnitude (V)11.9 mag
Absolute magnitude (V)-21.85
Characteristics
TypeSBb[4]
Apparent size (V)1.9′ × 1.4′
Other designations
LEDA 698, UGC 89, PGC 698, GC 9.[2][5]

The shape of this galaxy is described by its morphological classification of SBb, which indicates it is a barred spiral (SB) with spiral arms that are moderately tightly wound (b).[4] It is a luminous infrared galaxy with star-forming clumps.[7] In 1959 a candidate supernova was discovered in NGC 23 using the Hale Telescope. On a photographic plate taken August 23, a bright star with a visual magnitude around 16 was located 10″ to the north and 10″ east of the galactic center. It has vanished on a plate taken 60 days later.[8]


References


  1. Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131: 1163–1183. doi:10.1086/498708. ISSN 0004-6256.
  2. "NASA/IPAC Extragalactic Database". Results for NGC 0023. Retrieved 4 May 2010.
  3. Tully, R. Brent; et al. (2016). "Cosmicflows-3". The Astronomical Journal. 152 (2): 50. arXiv:1605.01765. Bibcode:2016AJ....152...50T. doi:10.3847/0004-6256/152/2/50.
  4. García-Lorenzo, B.; et al. (January 2015). "Ionized gas kinematics of galaxies in the CALIFA survey. I. Velocity fields, kinematic parameters of the dominant component, and presence of kinematically distinct gaseous systems". Astronomy & Astrophysics. 573: 43. arXiv:1408.5765. Bibcode:2015A&A...573A..59G. doi:10.1051/0004-6361/201423485. S2CID 55475658. A59.
  5. "NGC 23". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 March 2020.
  6. Jones, K. G. (1981). Webb Society Deep-Sky Observer's Handbook. Enslow Publishers. ISBN 978-0894901348.
  7. Larson, K. L.; et al. (January 2020). "Star-forming Clumps in Local Luminous Infrared Galaxies". The Astrophysical Journal. 888 (2): 92. arXiv:1911.09367. Bibcode:2020ApJ...888...92L. doi:10.3847/1538-4357/ab5dc3. S2CID 208202084. 92.
  8. Sandage, Allan (April 1959). "A Supernova in NGC 23". Publications of the Astronomical Society of the Pacific. 71 (419): 162. Bibcode:1959PASP...71..162S. doi:10.1086/127353.



На других языках

[de] NGC 23

NGC 23 ist eine aktive Balken-Spiralgalaxie mit hoher Sternentstehungsrate vom Hubble-Typ SBa[2] im Sternbild Pegasus am Nordsternhimmel. Sie ist schätzungsweise 212 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 130.000 Lichtjahren. Wahrscheinlich bildet sie gemeinsam mit NGC 26 ein gebundenes Galaxienpaar. Sie ist Mitglied der Galaxiengruppe LGG 2 oder NGC 23-Gruppe.
- [en] NGC 23

[es] NGC 23

NGC 23 es una galaxia espiral ubicada en la constelación de Pegaso. Fue descubierto por William Herschel el 10 de septiembre de 1784.

[ru] NGC 23

NGC 23 (другие обозначения — UGC 89, IRAS00073+2538, MCG 4-1-33, ZWG 477.62, MK 545, ZWG 478.34, KUG 0007+256, PGC 698) — спиральная галактика с перемычкой (SBa) в созвездии Пегас.


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