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NGC 3169 is a spiral galaxy about 75 million light years[3] away in the constellation Sextans. It has the morphological classification SA(s)a pec,[5] which indicates this is a pure, unbarred spiral galaxy with tightly-wound arms and peculiar features.[6] There is an asymmetrical spiral arm and an extended halo around the galaxy.[7] 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.[8]

NGC 3169
NGC 3169 by Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationSextans
Right ascension10h 14m 15.099s[1]
Declination+03° 27′ 58.03″[1]
Redshift+0.004113 ± 0.000017[2]
Helio radial velocity+1,232[3] km/s
Distance57 Mly (17.43 Mpc)[3]
Apparent magnitude (V)10.3
Characteristics
TypeSA(s)a pec[4]
Apparent size (V)4.2′ × 2.9′
Other designations
UGC 5525, PGC 29855[4]

This is a LINER 2 galaxy that displays an extended emission of X-rays in the region of the nucleus.[9] A hard X-ray source at the center most likely indicates an active galactic nucleus.[10] 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.[5]

In 1984, a Type II-L supernova was discovered in this galaxy. Designated 1984E, 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.[11] A second supernova was discovered in 2003; this time of type 1a. It was designated SN 2003 cg and reached peak magnitude 15.94.[12]

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.[13] 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.[5]


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. De Vaucouleurs, G.; De Vaucouleurs, A.; Corwin, Jr., H. G.; Buta, R. J.; Paturel, G.; Fouque, P. (1991), Third Reference Catalogue of Bright Galaxies, 3.9.{{citation}}: CS1 maint: multiple names: authors list (link)
  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. 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.
  12. 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.
  13. 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.


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На других языках

[de] NGC 3169

NGC 3169 ist eine Spiralgalaxie mit aktivem Galaxienkern vom Hubble-Typ Sa mit ausgedehnten Sternentstehungsgebieten im Sternbild Sextant südlich der Ekliptik. Sie ist schätzungsweise 49 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 70.000 Lichtjahren. Gemeinsam mit NGC 3165 und NGC 3166 bildet sie das gravitativ gebundene Galaxientrio Holm 173 oder KPG 228 und ist die hellste Galaxie der NGC 3169-Gruppe (LGG 192). Im selben Himmelsareal befinden sich die Galaxien NGC 3156 und NGC 3165.
- [en] NGC 3169

[ru] NGC 3169

NGC 3169 (другие обозначения — UGC 5525, MCG 1-26-26, ZWG 36.66, KCPG 228B, IRAS10116+0342, PGC 29855) — спиральная галактика (Sa) в созвездии Секстант, находящейся от Земли примерно в 70 млн световых лет. Является частью группы галактик Льва I, которая является частью Сверхскопления Девы[5][6].


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