NGC 3169
{{Short description|Galaxy in the constellation Sextans}}
{{Infobox Galaxy
| name = NGC 3169
| image = File:Up and Over NGC 3169.jpg
| caption = NGC 3169 imaged by the Hubble Space Telescope
| epoch = J2000
| dist_ly = 57 Mly (17.43 Mpc)
| z = {{nowrap|+0.004113 ± 0.000017}}
| h_radial_v = +1,232 km/s
| appmag_v = 10.3
| size_v = {{nowrap|4.2′ × 2.9′}}
| constellation name = Sextans
| notes =
}}
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.{{cite web | title=The Leo III Groups |work=Atlas of the Universe |url=http://www.atlasoftheuniverse.com/galgrps/leoii.html |access-date=2010-11-27 |archive-date=July 22, 2012 |archive-url=https://archive.today/20120722223749/http://www.atlasoftheuniverse.com/galgrps/leoii.html |url-status=live }}
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.{{cite journal | bibcode = 1984IAUC.3931....1W| title = Supernova in NGC 3169| last1 = Waagen| first1 = E.| last2 = Evans| first2 = R.| last3 = Cragg| first3 = T.| last4 = Aksenov| first4 = E. P.| last5 = Terebizh| first5 = Yu. V.| last6 = Metlova| first6 = N.| last7 = Kozai| first7 = Y.| last8 = Okazaki| first8 = K.| journal = International Astronomical Union Circular| date = 1984| issue = 3931| page = 1}}{{cite web | website=Transient Name Server | title=SN{{nbsp}}1984E | url=https://www.wis-tns.org/object/1984E | publisher = IAU | access-date=5 December 2024}} 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.{{cite journal | bibcode = 2003IAUC.8097....1N| title = Supernovae 2003cg, 2003ch, and 2003ci| last1 = Nakano| first1 = S.| last2 = Arbour| first2 = R.| last3 = Swift| first3 = B.| last4 = Li| first4 = W.| last5 = Kushida| first5 = Y.| last6 = Kushida| first6 = R.| journal = International Astronomical Union Circular| date = 2003| issue = 8097| page = 1}}{{cite web | website=Transient Name Server | title=SN{{nbsp}}2003cg | url=https://www.wis-tns.org/object/2003cg | publisher = IAU | access-date=5 December 2024}}
References
{{reflist|refs=
| title=NED results for object NGC 3169
| publisher=NASA
| work=NASA/IPAC Extragalactic Database
| url=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
| access-date=2013-05-30
| postscript = .
}}
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| volume = 655
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| arxiv = astro-ph/0610732
| s2cid = 11672751
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| title = Chandra Snapshot Observations of Low-Luminosity Active Galactic Nuclei with a Compact Radio Source
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| last1 = Haynes
| first1 = M. P.
| title = Neutral hydrogen streams in groups of galaxies. I - Observations
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| pages = 1126–1154
|date=August 1981
| doi = 10.1086/112993
| bibcode = 1981AJ.....86.1126H
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| last1 = Henry
| first1 = Richard B. C.
| last2 = Branch
| first2 = David
| title = The spectrum of the type II-L supernova 1984E in NGC 3169 Further evidence for a superwind?
| journal = Publications of the Astronomical Society of the Pacific
| volume = 99
| pages = 112–115
|date=February 1987
| doi = 10.1086/131962
| bibcode = 1987PASP...99..112H
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| last1 = Elias-Rosa | first1 = N.
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| last3 = Cappellaro | first3 = E.
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| last5 = Mazzali | first5 = P. A.
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| last14 = Navasardyan | first14 = H.
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| last16 = Salvo | first16 = M.
| last17 = Hillebrandt | first17 = W.
| display-authors = 1
| title = Anomalous extinction behaviour towards the Type Ia SN 2003cg
| journal = Monthly Notices of the Royal Astronomical Society
| volume = 369
| issue = 4
| pages = 1880–1900
|date=July 2006
| doi = 10.1111/j.1365-2966.2006.10430.x
| doi-access = free
| bibcode = 2006MNRAS.369.1880E
| arxiv = astro-ph/0603316
| s2cid = 15108977
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| last1 = Drory
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| title = A Connection between Bulge Properties and the Bimodality of Galaxies
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| volume = 662
| issue = 2
| pages = 640–649
|date=August 2007
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| bibcode = 2007ApJ...664..640D
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}}
| last1 = Sil'chenko
| first1 = O. K.
| last2 = Afanasiev
| first2 = V. L.
| title = Central regions of the early-type galaxies in the NGC 3169 group
| journal = Astronomy Letters
| volume = 32
| issue = 8
| pages = 534–544
|date=August 2006
| doi = 10.1134/S1063773706080044
| bibcode = 2006AstL...32..534S
| postscript = .
| citeseerx = 10.1.1.515.4412
| s2cid = 53956086
}}
| last1=De Vaucouleurs, G.
| last2=De Vaucouleurs, A.
| last3=Corwin, H. G. Jr.
| last4=Buta, R. J.
| last5=Paturel, G.
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| year=1991
| title=Third Reference Catalogue of Bright Galaxies
| version=3.9
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}}
}}
External links
{{commons category}}
- [http://www.noao.edu/outreach/aop/observers/n3169.html APOD: NGC 3169 and NGC 3166 (02/28/2004)] {{Webarchive|url=https://web.archive.org/web/20150511100748/http://www.noao.edu/outreach/aop/observers/n3169.html |date=2015-05-11 }}
- [http://adsabs.harvard.edu/abs/2003IAUC.8099....1K ADS: Supernova 2003cg in NGC 3169]
- [https://web.archive.org/web/20060717032806/http://www.seds.org/~spider/ngc/ngc.cgi?NGC3169 SEDS: NGC3169]
- {{WikiSky}}
{{Sky|10|14|14.7|+|03|28|01|70000000}}
{{NGC objects:3000-3499|state=collapsed}}{{Sextans}}
{{DEFAULTSORT:NGC 3169}}