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NGC 3169
NGC 3169 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
Constellation	Sextans
Right ascension	10 14 15.099
Declination	+03° 27′ 58.03″
Redshift	+0.004113 ± 0.000017
Heliocentric radial velocity	+1,232 km/s
Distance	57 Mly (17.43 Mpc)
Apparent magnitude (V)	10.3
Characteristics
Type	SA(s)a pec
Apparent size (V)	4.2′ × 2.9′
Other designations
UGC 5525, PGC 29855

NGC 3169 is a spiral galaxy about 75 million light years away in the constellation Sextans. It has the morphological classification SA(s)a pec, which indicates this is a pure, unbarred spiral galaxy with tightly-wound arms and peculiar features. There is an asymmetrical spiral arm and an extended halo around the galaxy. It is a member of the NGC 3166 Group of galaxies, which is a member of the Leo II Groups, a series of galaxies and galaxy clusters strung out from the right edge of the Virgo Supercluster.

This is a LINER 2 galaxy that displays an extended emission of X-rays in the region of the nucleus. A hard X-ray source at the center most likely indicates an active galactic nucleus. The stellar population in the nucleus, and a ring at an angular radius of 6″, shows an age of only one billion years and is generally younger than the surrounding stellar population. This suggests that a burst of star formation took place in the nucleus roughly one billion years ago.

NGC 3169 is located in close physical proximity to NGC 3166, and the two have an estimated separation of around 160 kly (50 kpc). Their interaction is creating a gravitational distortion that has left the disk of NGC 3166 warped. Combined with NGC 3156, the three galaxies form a small group within the larger Leo 1 group. The three are embedded within an extended ring of neutral hydrogen that is centered on NGC 3169.

Supernovae

Two supernovae have been observed in NGC 3169:

• SN 1984E (Type II-L, mag. 14.5) was codiscovered by Nataliya Metlova on 26 March 1984, and by Robert Evans on 29 March 1984. The spectrum of this event at maximum light showed prominent Balmer lines that indicated the explosion occurred inside a dense shell of hydrogen surrounding the star. This shell was likely created by a strong stellar wind from the progenitor star.
• SN 2003cg (type Ia, mag. 14.4) was codiscovered by Kōichi Itagaki and Ron Arbour on 21 March 2003.

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 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331.
2. De Vaucouleurs, G.; De Vaucouleurs, A.; Corwin, H. G. Jr.; Buta, R. J.; Paturel, G.; Fouque, P. (1991), Third Reference Catalogue of Bright Galaxies, 3.9.
3. ^ Crook, Aidan C.; et al. (February 2007), "Groups of Galaxies in the Two Micron All Sky Redshift Survey", The Astrophysical Journal, 655 (2): 790–813, arXiv:astro-ph/0610732, Bibcode:2007ApJ...655..790C, doi:10.1086/510201, S2CID 11672751.
4. ^ "NED results for object NGC 3169", NASA/IPAC Extragalactic Database, NASA, retrieved 2013-05-30.
5. ^ Sil'chenko, O. K.; Afanasiev, V. L. (August 2006), "Central regions of the early-type galaxies in the NGC 3169 group", Astronomy Letters, 32 (8): 534–544, Bibcode:2006AstL...32..534S, CiteSeerX 10.1.1.515.4412, doi:10.1134/S1063773706080044, S2CID 53956086.
6. Buta, Ronald J.; et al. (2007), Atlas of Galaxies, Cambridge University Press, pp. 13–17, ISBN 978-0521820486.
7. Haynes, M. P. (August 1981), "Neutral hydrogen streams in groups of galaxies. I - Observations", Astronomical Journal, 86: 1126–1154, Bibcode:1981AJ.....86.1126H, doi:10.1086/112993.
8. "The Leo III Groups". Atlas of the Universe. Archived from the original on July 22, 2012. Retrieved 2010-11-27.
9. Terashima, Yuichi; Wilson, Andrew S. (January 2003), "Chandra Snapshot Observations of Low-Luminosity Active Galactic Nuclei with a Compact Radio Source", The Astrophysical Journal, 583 (1): 145–158, arXiv:astro-ph/0209607, Bibcode:2003ApJ...583..145T, doi:10.1086/345339, S2CID 16047866.
10. Mathur, Smita; et al. (October 2008), "AIP Conference Proceedings", American Institute of Physics Conference Series, 1053: 43–49, arXiv:0807.0422, Bibcode:2008AIPC.1053...43M, doi:10.1063/1.3009521, S2CID 118424765.
11. Drory, Niv; Fisher, David B. (August 2007), "A Connection between Bulge Properties and the Bimodality of Galaxies", The Astrophysical Journal, 662 (2): 640–649, arXiv:0705.0973, Bibcode:2007ApJ...664..640D, doi:10.1086/519441, S2CID 17999271.
12. Waagen, E.; Evans, R.; Cragg, T.; Aksenov, E. P.; Terebizh, Yu. V.; Metlova, N.; Kozai, Y.; Okazaki, K. (1984). "Supernova in NGC 3169". International Astronomical Union Circular (3931): 1. Bibcode:1984IAUC.3931....1W.
13. "SN 1984E". Transient Name Server. IAU. Retrieved 5 December 2024.
14. Henry, Richard B. C.; Branch, David (February 1987), "The spectrum of the type II-L supernova 1984E in NGC 3169 Further evidence for a superwind?", Publications of the Astronomical Society of the Pacific, 99: 112–115, Bibcode:1987PASP...99..112H, doi:10.1086/131962.
15. Nakano, S.; Arbour, R.; Swift, B.; Li, W.; Kushida, Y.; Kushida, R. (2003). "Supernovae 2003cg, 2003ch, and 2003ci". International Astronomical Union Circular (8097): 1. Bibcode:2003IAUC.8097....1N.
16. Elias-Rosa, N.; et al. (July 2006), "Anomalous extinction behaviour towards the Type Ia SN 2003cg", Monthly Notices of the Royal Astronomical Society, 369 (4): 1880–1900, arXiv:astro-ph/0603316, Bibcode:2006MNRAS.369.1880E, doi:10.1111/j.1365-2966.2006.10430.x, S2CID 15108977.
17. "SN 2003cg". Transient Name Server. IAU. Retrieved 5 December 2024.

External links

• APOD: NGC 3169 and NGC 3166 (02/28/2004) Archived 2015-05-11 at the Wayback Machine
• ADS: Supernova 2003cg in NGC 3169
• SEDS: NGC3169
• NGC 3169 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

v t e Constellation of Sextans
List of stars in Sextans Sextans in Chinese astronomy
Stars	Bayer α β γ δ ε Flamsteed 3 4 5 6 7 9 12 13 14 16 17 18 19 20 21 23 24 25 26 27 31 32 33 34 35 36 39 40 41 Variable S T Y RW SW VY HR 3879 3901 3907 3915 3959 4000 4034 4059 4060 4085 4092 4109 4122 4224 4233 4240 HD 85461 86081 86341 90057 92788 93396 Other BD−08°2823 FIRST J102347.6+003841 Gliese 382 Gliese 393 LHS 292 PG 1026+002 PG 1047+003 PSR J0952–0607 TOI-561 WASP-43
Exoplanets BD-08°2823 b c HD 86081 b HD 92788 b KELT-11b WASP-43b TOI-561 b
Galaxies	NGC 2974 3044 3110 3115 3156 3169 3341 Other Baby Boom Galaxy CID-42 Cosmos Redshift 7 HD1 LAE J095950.99+021219.1 PGC 29820 REBELS-25 Sextans A Sextans B Sextans Dwarf Spheroidal AT2018hyz
Galaxy clusters CL J1001+0220 Hyperion proto-supercluster
Category

• NGC objects
• UGC objects
• Unbarred spiral galaxies
• Sextans
• Principal Galaxies Catalogue objects
• MCG objects
• IRAS catalogue objects
• Astronomical objects discovered in 1783