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NGC 3945 is a barred lenticular galaxy in the constellation Ursa Major. It was discovered on March 19, 1790 by the astronomer William Herschel.[5]

NGC 3945
Hubble Space Telescope image of NGC 3945
Observation data (J2000 epoch)
ConstellationUrsa Major
Right ascension11h 53m 13.726s[1]
Declination+60° 40′ 32.02″[1]
Redshift0.004153[2]
Helio radial velocity1242 ± 22 km/s[2]
Distance63 Mly (19.4 Mpc)[3]
Apparent magnitude (V)10.75[4]
Apparent magnitude (B)11.70[4]
Characteristics
Type(R)SB(rs)0+[3]
Other designations
UGC 6860, MCG +10-17-096, PGC 37258[2]

NGC 3945 has a complex structure, with two concentric bars and a pseudobulge.[3] Unlike classical bulges which are like miniature elliptical galaxies, pseudobulges have features similar to disk galaxies, including a flattened structure and significant rotation.[6] It is classified as a LINER galaxy.[3] The formation history of NGC 3945 is likely quite complex, with the pseudo-bulge being formed gradually from disk material, while bulges (spheroidal components) would have formed from violent merger events.[3]

Unlike galaxies with similar velocity dispersions and luminosities, the central black hole of NGC 3945 has an unusually low mass, estimated to be around 9×106 M☉. However, it is also possible that NGC 3945 has no central black hole at all.[7]


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. "NGC 3945". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-05-18.
  3. Dullo, Bililign T.; Martínez-Lombilla, Cristina; Knapen, Johan H. (2016). "Complex central structures suggest complex evolutionary paths for barred S0 galaxies". Monthly Notices of the Royal Astronomical Society. 462 (4): 3800–3811. arXiv:1608.03539. doi:10.1093/mnras/stw1868.
  4. "Search specification: NGC 3945". HyperLeda. Université Claude Bernard Lyon 1. Retrieved 2021-05-18.
  5. Seligman, Courtney. "New General Catalogue objects: NGC 3900 - 3949". cseligman.com. Retrieved 2021-05-18.
  6. Fisher, David B.; Drory, Niv (2008). "The Structure of Classical Bulges and Pseudobulges: The Link Between Pseudobulges and Sérsic Index". The Astronomical Journal. 136 (2): 773–839. arXiv:0805.4206. Bibcode:2008AJ....136..773F. doi:10.1088/0004-6256/136/2/773. S2CID 16126374.
  7. Gültekin, Kayhan; Richstone, Douglas O.; Gebhardt, Karl; Lauer, Tod R.; Pinkney, Jason; Aller, M. C.; Bender, Ralf; Dressler, Alan; Faber, S. M.; Filippenko, Alexei V.; Green, Richard; Ho, Luis C.; Kormendy, John; Siopis, Christos (2009). "A Quintet of Black Hole Mass Determinations". The Astrophysical Journal. 695 (2): 1577–1590. arXiv:0901.4162. Bibcode:2009ApJ...695.1577G. doi:10.1088/0004-637X/695/2/1577. S2CID 14365610.


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[de] NGC 3945

NGC 3945 ist eine linsenförmige Galaxie mit aktivem Galaxienkern vom Hubble-Typ SB0 im Sternbild Großer Bär am Nordsternhimmel. Sie ist schätzungsweise 62 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 90.000 Lj. Im selben Himmelsareal befinden sich die Galaxien NGC 3975 und NGC 3978.
- [en] NGC 3945

[ru] NGC 3945

NGC 3945 (другие обозначения — UGC 6860, MCG 10-17-96, ZWG 292.42, IRAS11506+6056, PGC 37258) — линзообразная галактика (SB0) в созвездии Большая Медведица.


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