NGC 3945 has a complex structure, with two concentric bars and apseudobulge.[3] Unlike classical bulges which are like miniatureelliptical galaxies, pseudobulges have features similar to disk galaxies, including a flattened structure and significant rotation.[6] It is classified as aLINER 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 violentmerger events.[3]
Unlike galaxies with similarvelocity dispersions andluminosities, the centralblack hole of NGC 3945 has an unusually low mass, estimated to be around9×106M☉. However, it is also possible that NGC 3945 has no central black hole at all.[7]
^abSkrutskie, 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.ISSN0004-6256.S2CID18913331.
^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.S2CID14365610.
Media related toNGC 3945 at Wikimedia Commons.jpg)
