As seen from the
Earth, it is inclined by an angle of 18° to the
line of sight along a
position angle of 145°. The
morphological classification in the
De Vaucouleurs system is SA(s)d,[2] indicating a pure spiral structure with loosely wound arms.[6] However, optical images of the galaxy indicate the presence of a weak bar structure spanning an angle of 12″ across the nucleus. There is a
dwarf galaxy located around 650×10^3 ly (200 kpc) to the southeast of NGC 5668, and the two may be gravitationally interacting.[2]
Three
supernovae have been observed in this galaxy: SN 1952G, SN 1954B, and SN 2004G.[7] The last, a
type II supernova,[8] was initially imaged on January 19, 2004, at 43" to the west and 12".5 south of the galaxy core.[7] High velocity clouds of
neutral hydrogen have been observed in NGC 5668, which may have their origin in supernova explosions and strong
stellar winds.[9]
Gallery
NGC 5668 (SDSS DR14)
References
^
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.
^
abNakano, S.; et al. (2004), "Supernova 2004G in NGC 5668", IAU Circular, 8272: 1,
Bibcode:
2004IAUC.8272....1N.
^Elias-Rosa, N.; et al. (2004), "Supernova 2004G in NGC 5668", IAU Circular, 8273: 2,
Bibcode:
2004IAUC.8273....2E.
^Jiménez-Vicente, J.; Battaner, E. (June 2000), "Vertical motions in the disk of NGC 5668 as seen with optical Fabry-Perot spectroscopy", Astronomy and Astrophysics, 358: 812–818,
arXiv:astro-ph/0004295,
Bibcode:
2000A&A...358..812J.