NGC 24 is a spiral galaxy in the southern constellation of Sculptor, about 23.8 megalight-years distant from the Milky Way.[3] It was discovered by British astronomer William Herschel in 1785, and measures some 40,000 light-years across.[7] The general shape of this galaxy is specified by its morphological classification of SA(s)c,[5] which indicates it is an unbarred spiral with no ring-like structure and moderate to loosely-wound spiral arms. This galaxy is positioned in the vicinity of the Sculptor Group, but is actually a background object that is more than three times as distant. It may form a pair with another background galaxy, NGC 45.[8]
| NGC 24 | |
|---|---|
 HST image of NGC 24 | |
| Observation data (J2000 epoch) | |
| Constellation | Sculptor |
| Right ascension | 00h 09m 56.542s[1] |
| Declination | −24° 57′ 47.27″[1] |
| Redshift | 0.00185±0.00001[2] |
| Heliocentric radial velocity | 554.017±2.099 km/s[2] |
| Distance | 23.8 Mly (7.31 Mpc)[3] |
| Apparent magnitude (V) | 12.4[4] |
| Absolute magnitude (V) | −17.61 |
| Characteristics | |
| Type | SA(s)c[5] |
| Apparent size (V) | 5.7' x 1.5' |
| Other designations | |
| UGCA 2, ESO 472-G016, MCG-04-01-018, ESO-LV 4720160,[6] PGC 701, CGS 119[4] | |
References
edit- ^ a b 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 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331.1163-1183&rft.date=2006-02-01&rft_id=info:doi/10.1086/498708&rft_id=https://api.semanticscholar.org/CorpusID:18913331#id-name=S2CID&rft.issn=0004-6256&rft_id=info:bibcode/2006AJ....131.1163S&rft.aulast=Skrutskie&rft.aufirst=Michael F.&rft.au=Cutri, Roc M.&rft.au=Stiening, Rae&rft.au=Weinberg, Martin D.&rft.au=Schneider, Stephen E.&rft.au=Carpenter, John M.&rft.au=Beichman, Charles A.&rft.au=Capps, Richard W.&rft.au=Chester, Thomas&rft.au=Elias, Jonathan H.&rft.au=Huchra, John P.&rft.au=Liebert, James W.&rft.au=Lonsdale, Carol J.&rft.au=Monet, David G.&rft.au=Price, Stephan&rft.au=Seitzer, Patrick&rft.au=Jarrett, Thomas H.&rft.au=Kirkpatrick, J. Davy&rft.au=Gizis, John E.&rft.au=Howard, Elizabeth V.&rft.au=Evans, Tracey E.&rft.au=Fowler, John W.&rft.au=Fullmer, Linda&rft.au=Hurt, Robert L.&rft.au=Light, Robert M.&rft.au=Kopan, Eugene L.&rft.au=Marsh, Kenneth A.&rft.au=McCallon, Howard L.&rft.au=Tam, Robert&rft.au=Van Dyk, Schuyler D.&rft.au=Wheelock, Sherry L.&rft_id=https://doi.org/10.1086%2F498708&rfr_id=info:sid/en.wikipedia.org:NGC 24" class="Z3988">
- ^ a b Koribalski, B. S.; et al. (July 2004). "The 1000 Brightest HIPASS Galaxies: H I Properties". The Astronomical Journal. 128 (1): 16–46. arXiv:astro-ph/0404436. Bibcode:2004AJ....128...16K. doi:10.1086/421744. S2CID 16229767.16-46&rft.date=2004-07&rft_id=info:arxiv/astro-ph/0404436&rft_id=https://api.semanticscholar.org/CorpusID:16229767#id-name=S2CID&rft_id=info:doi/10.1086/421744&rft_id=info:bibcode/2004AJ....128...16K&rft.aulast=Koribalski&rft.aufirst=B. S.&rft.au=Staveley-Smith, L.&rft.au=Kilborn, V. A.&rft.au=Ryder, S. D.&rft.au=Kraan-Korteweg, R. C.&rft.au=Ryan-Weber, E. V.&rft.au=Ekers, R. D.&rft.au=Jerjen, H.&rft.au=Henning, P. A.&rft.au=Putman, M. E.&rft.au=Zwaan, M. A.&rft.au=de Blok, W. J. G.&rft.au=Calabretta, M. R.&rft.au=Disney, M. J.&rft.au=Minchin, R. F.&rft.au=Bhathal, R.&rft.au=Boyce, P. J.&rft.au=Drinkwater, M. J.&rft.au=Freeman, K. C.&rft.au=Gibson, B. K.&rft.au=Green, A. J.&rft.au=Haynes, R. F.&rft.au=Juraszek, S.&rft.au=Kesteven, M. J.&rft.au=Knezek, P. M.&rft.au=Mader, S.&rft.au=Marquarding, M.&rft.au=Meyer, M.&rft.au=Mould, J. R.&rft.au=Oosterloo, T.&rft.au=O'Brien, J.&rft.au=Price, R. M.&rft.au=Sadler, E. M.&rft.au=Schröder, A.&rft.au=Stewart, I. M.&rft.au=Stootman, F.&rft.au=Waugh, M.&rft.au=Warren, B. E.&rft.au=Webster, R. L.&rft.au=Wright, A. E.&rfr_id=info:sid/en.wikipedia.org:NGC 24" class="Z3988">
- ^ a b Karachentsev, Igor D.; et al. (January 2017). "The Local Tully-Fisher Relation for Dwarf Galaxies". The Astronomical Journal. 153 (1): 17. arXiv:1611.02574. Bibcode:2017AJ....153....6K. doi:10.3847/1538-3881/153/1/6. S2CID 119388974. 6.
- ^ a b "NASA/IPAC Extragalactic Database". Results for NGC 0024. Retrieved 2010-05-04.
- ^ a b de Vaucouleurs, G.; et al. (1991). Third reference catalogue of bright galaxies. 9. New York: Springer-Verlag.
- ^ "NGC 24". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 January 2017.
- ^ "The hidden dark side of NGC 24". www.spacetelescope.org. Retrieved 26 September 2016.
- ^ Chemin, Laurent; et al. (December 2006). "H I Studies of the Sculptor Group Galaxies. VIII. The Background Galaxies: NGC 24 and NGC 45". The Astronomical Journal. 132 (6): 2527–2538. arXiv:astro-ph/0609148. Bibcode:2006AJ....132.2527C. doi:10.1086/508859. S2CID 947116.2527-2538&rft.date=2006-12&rft_id=info:arxiv/astro-ph/0609148&rft_id=https://api.semanticscholar.org/CorpusID:947116#id-name=S2CID&rft_id=info:doi/10.1086/508859&rft_id=info:bibcode/2006AJ....132.2527C&rft.aulast=Chemin&rft.aufirst=Laurent&rft.au=Carignan, Claude&rft.au=Drouin, Nathalie&rft.au=Freeman, Kenneth C.&rfr_id=info:sid/en.wikipedia.org:NGC 24" class="Z3988">
External links
edit
Media related to NGC 24 at Wikimedia Commons- NGC 24 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
