NGC 2950
| NGC 2950 | |
|---|---|
 SDSSimage of NGC 2950 (center) | |
| Observation data (J2000epoch) | |
| Constellation | Ursa Major |
| Right ascension | 09h42m35.116s[1] |
| Declination | 58° 51′ 04.39″[1] |
| Redshift | 0.004410 ± 0.000017 |
| Heliocentric radial velocity | 1,329[2]km/s |
| Distance | 49.84 ± 0.46Mly(15.28 ± 0.14Mpc)[2] |
| Apparent magnitude(B) | 11.93[2] |
| Characteristics | |
| Type | RSB0(r)[3] |
| Apparent size(V) | 2′.7 × 1′.8[3] |
| Other designations | |
| NGC2950,UGC5176,PGC27765[4] | |
NGC 2950is alenticular galaxyin the northernconstellationofUrsa Major,about 50 millionlight yearsfrom theMilky Wayand receding with a heliocentricradial velocityof 1,329 km/s.[2]It was discovered in1790by the Anglo-German astronomerWilliam Herschel.[5]NGC 2950 is afield galaxy,it is not part of agalaxy clusterorgalaxy group,and thus is gravitationally isolated.[6]Nine certain and four possibledwarf galaxieshave been identified around NGC 2950.[7]
Themorphological classificationof this galaxy is RSB0(r),[3]indicating abarredlenticular galaxy (SB0) with outer (R) and inner (r) ring structures. It hosts two nested stellar bars; the rotation frequency of the secondary bar is higher than that of the primary one.[3]Double bars of this type are relatively common, having been found in ~30% of barred lenticulars. The inner bar appears to be counter-rotating relative to the outer bar,[8]with the two passing cleanly through each other.[9]The stellar mass of the galaxy is1.7×1010M☉while the halo mass is6.6×1011M☉.[7]
References
[edit]- ^abSkrutskie, Michael F.; et al. (February 1, 2006)."The Two Micron All Sky Survey (2MASS)".The Astronomical Journal.131(2): 1163–1183.Bibcode:2006AJ....131.1163S.doi:10.1086/498708.ISSN0004-6256.S2CID18913331.
- ^abcdTully, R. Brent; et al. (October 2013), "Cosmicflows-2: The Data",The Astronomical Journal,146(4): 25,arXiv:1307.7213,Bibcode:2013AJ....146...86T,doi:10.1088/0004-6256/146/4/86,S2CID118494842,86
- ^abcdCorsini, E. M.; et al. (December 2003). "Direct Confirmation of Two Pattern Speeds in the Double-barred Galaxy NGC 2950".The Astrophysical Journal.599(1): L29–L32.arXiv:astro-ph/0310879.Bibcode:2003ApJ...599L..29C.doi:10.1086/381080.S2CID13102437.
- ^"NGC 2950".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2020-12-16.
- ^Seligman, Courtney (2016)."NGC 2950 (= PGC 27765)".Celestial Atlas.Professor Seligman.RetrievedMay 1,2020.
- ^"NASA/IPAC Extragalactic Database".Results for NGC 2950.RetrievedOctober 28,2018.
- ^abTanaka, Masayuki; et al. (October 2018)."The Missing Satellite Problem Outside of the Local Group. I. Pilot Observation".The Astrophysical Journal.865(2): 12.arXiv:1808.03410.Bibcode:2018ApJ...865..125T.doi:10.3847/1538-4357/aad9fe.S2CID119244164.125.
- ^Maciejewski, Witold (September 2006)."Response of the integrals in the Tremaine-Weinberg method to multiple pattern speeds: a counter-rotating inner bar in NGC 2950?".Monthly Notices of the Royal Astronomical Society.371(1): 451–458.arXiv:astro-ph/0602520.Bibcode:2006MNRAS.371..451M.doi:10.1111/j.1365-2966.2006.10679.x.S2CID16623123.
- ^Maciejewski, W. (October 2008). Funes, José G.; J., S.; Corsini, Enrico Maria (eds.).Orbits in Corotating and Counterrotating Double Bars.Proceedings of the conference held 1-5 October, 2007 at the Centro Convegni Matteo Ricci, Rome, Italy. Formation and Evolution of Galaxy Disks ASP Conference Series. Vol. 396. San Francisco: Astronomical Society of the Pacific. p. 367.arXiv:0801.1471.Bibcode:2008ASPC..396..367M.
External links
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Media related toNGC 2950at Wikimedia Commons
