Astronomy:NGC 3169

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Short description: Galaxy in the constellation Sextans
NGC 3169
Up and Over NGC 3169.jpg
Observation data (J2000 epoch)
ConstellationSextans
Right ascension 10h 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]

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]

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]

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.[11] 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]

Supernovae

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.[12] A second supernova was discovered in 2003: SN 2003cg (type Ia, mag. 14.4).[13][14]

References

  1. ↑ 1.0 1.1 Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W. et al. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal 131 (2): 1163–1183. doi:10.1086/498708. ISSN 0004-6256. Bibcode: 2006AJ....131.1163S. https://ui.adsabs.harvard.edu/abs/2006AJ....131.1163S/abstract. 
  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. 
  3. ↑ 3.0 3.1 3.2 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, doi:10.1086/510201, Bibcode: 2007ApJ...655..790C. 
  4. ↑ 4.0 4.1 "NED results for object NGC 3169", NASA/IPAC Extragalactic Database (NASA), http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=ngc+3169&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES, retrieved 2013-05-30. 
  5. ↑ 5.0 5.1 5.2 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, doi:10.1134/S1063773706080044, Bibcode: 2006AstL...32..534S. 
  6. ↑ Buta, Ronald J. et al. (2007), Atlas of Galaxies, Cambridge University Press, pp. 13–17, ISBN 978-0521820486, https://books.google.com/books?id=g-P7dCbB5MEC&pg=PA16. 
  7. ↑ Haynes, M. P. (August 1981), "Neutral hydrogen streams in groups of galaxies. I - Observations", Astronomical Journal 86: 1126–1154, doi:10.1086/112993, Bibcode: 1981AJ.....86.1126H. 
  8. ↑ "The Leo III Groups". Atlas of the Universe. http://www.atlasoftheuniverse.com/galgrps/leoii.html. 
  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, doi:10.1086/345339, Bibcode: 2003ApJ...583..145T. 
  10. ↑ Mathur, Smita et al. (October 2008), "AIP Conference Proceedings", American Institute of Physics Conference Series 1053: 43–49, doi:10.1063/1.3009521, Bibcode: 2008AIPC.1053...43M. 
  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, doi:10.1086/519441, Bibcode: 2007ApJ...664..640D. 
  12. ↑ 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, doi:10.1086/131962, Bibcode: 1987PASP...99..112H. 
  13. ↑ 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, doi:10.1111/j.1365-2966.2006.10430.x, Bibcode: 2006MNRAS.369.1880E. 
  14. ↑ Transient Name Server entry for SN 2003cg. Retrieved 29 March 2023.

External links


Coordinates: Sky map 10h 14m 14.7s, +03° 28′ 01″



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