NGC 3169

NGC 3169
NGC 3169
	NGC 3169 by Hubble Space Telescope
Observation data (J2000 epoch)
Constellation	Sextans
Right ascension	10h 14m 15.099s
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

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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]

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]

^ ^a ^b Cite error: The named reference ApJ131_1163 was invoked but never defined (see the help page).
^ Cite error: The named reference DeVaucouleurs1991 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Crook2007 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference ned was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Silchenko2006 was invoked but never defined (see the help page).
^ Cite error: The named reference Buta2007 was invoked but never defined (see the help page).
^ Cite error: The named reference Haynes1981 was invoked but never defined (see the help page).
^ "The Leo III Groups". Atlas of the Universe. Archived from the original on July 22, 2012. Retrieved 2010-11-27.
^ Cite error: The named reference Terashima2003 was invoked but never defined (see the help page).
^ Cite error: The named reference Mathur2008 was invoked but never defined (see the help page).
^ Cite error: The named reference Drory2007 was invoked but never defined (see the help page).

[ApJ131_1163-1] Cite error: The named reference ApJ131_1163 was invoked but never defined (see the help page).

[DeVaucouleurs1991-2] Cite error: The named reference DeVaucouleurs1991 was invoked but never defined (see the help page).

[Crook2007-3] Cite error: The named reference Crook2007 was invoked but never defined (see the help page).

[ned-4] Cite error: The named reference ned was invoked but never defined (see the help page).

[Silchenko2006-5] Cite error: The named reference Silchenko2006 was invoked but never defined (see the help page).

[Buta2007-6] Cite error: The named reference Buta2007 was invoked but never defined (see the help page).

[Haynes1981-7] Cite error: The named reference Haynes1981 was invoked but never defined (see the help page).

[atlas_universe-8] "The Leo III Groups". Atlas of the Universe. Archived from the original on July 22, 2012. Retrieved 2010-11-27.

[Terashima2003-9] Cite error: The named reference Terashima2003 was invoked but never defined (see the help page).

[Mathur2008-10] Cite error: The named reference Mathur2008 was invoked but never defined (see the help page).

[Drory2007-11] Cite error: The named reference Drory2007 was invoked but never defined (see the help page).

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