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NGC 4670
NGC 4670
	NGC 4670 by Hubble Space Telescope
Observation data (J2000 epoch)
Constellation	Coma Berenices
Right ascension	12h 45m 17.1s
Declination	+27° 07′ 32″
Redshift	0.003630 ± 0.000005
Heliocentric radial velocity	1,088 ± 1 km/s
Distance	57.6 ± 17 Mly (17.7 ± 4.7 Mpc)
Apparent magnitude (V)	12.2
Characteristics
Type	SB(s)0/a pec
Apparent size (V)	1.4′ × 1.1′
Notable features	Blue compact dwarf
Other designations
	UGC 7930, Arp 163, Haro 9, MCG +05-30-072, KUG 1242+273, IRAS 12428+2724, PGC 42987

NGC 4670 is a blue compact galaxy in the constellation Coma Berenices. The galaxy lies about 60 million light years away from Earth, which means, given its apparent dimensions, that NGC 4670 is approximately 25,000 light years across.^[1] It was discovered by William Herschel on April 6, 1785.^[3]

Characteristics

The overall shape of the galaxy is categorised as peculiar and it has been categorised as amorphous or as barred lenticular galaxy. NGC 4670 is included in the Atlas of Peculiar Galaxies in the galaxies with diffuse counter tails category. The gas kinematics indicate the presence of a central bar.^[4] The galaxy is seen with an 28° inclination but it is possibly warped.^[5]

NGC 4670 is characterised by its blue color, which was noted by Guillermo Haro in a study published in 1956.^[6] Such galaxies are characterised by episodes of intense star formation. The centre of NGC 4670 hosts a supergiant HII region and also hosts most of the hydrogen of the galaxy. The hydrogen lies in three clouds with an estimated mass of 10⁸ M_☉.^[5] Four other HII regions are visible near the central region.^[7]

The galaxy has also ionised gas outside of the central region, forming bubbles and filaments. The two larger filaments extend to the southwest and northeast and a have a calculated length of 7.5 and 6.5 kpc respectively.^[4]

An X-ray and radio source has been detected in the galaxy at the location of a star cluster complex but its nature is uncertain. It could be a massive black hole, an ultraluminous X-ray bubble, an X-ray binary star or a supernova remnant.^[8]

Nearby galaxies

NGC 4670 is considered to be a member of the NGC 4565 Group, which also includes, apart from NGC 4565, the galaxies NGC 4494, NGC 4562, NGC 4725, and NGC 4747.^[9]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h "NASA/IPAC Extragalactic Database". Results for NGC 4670. Retrieved 2024-03-26.
^ "Revised NGC Data for NGC 4670". spider.seds.org. Retrieved 30 March 2024.
^ Seligman, Courtney. "NGC 4670 (= PGC 17296 = ESO 085-087)". Celestial Atlas. Retrieved 19 November 2018.
^ ^a ^b Cairós, L. M.; Caon, N.; García Lorenzo, B.; Kelz, A.; Roth, M.; Papaderos, P.; Streicher, O. (November 2012). "Mapping luminous blue compact galaxies with VIRUS-P: Morphology, line ratios, and kinematics". Astronomy & Astrophysics. 547: A24. arXiv:1209.0310. Bibcode:2012A&A...547A..24C. doi:10.1051/0004-6361/201219598.
^ ^a ^b Hunter, Deidre A.; Van Woerden, Hugo; Gallagher III, John S. (December 1996). "Neutral Hydrogen Observations of the Amorphous Galaxy NGC 4670 at Moderate Spatial Resolution". The Astrophysical Journal Supplement Series. 107 (2): 739–746. Bibcode:1996ApJS..107..739H. doi:10.1086/192379.
^ G. Haro (1956). "Preliminary note on blue galaxies with nuclear emission". Astronomical Journal. 1: 178. Bibcode:1956AJ.....61R.178H. doi:10.1086/107409.
^ Kumari, Nimisha; James, Bethan L; Irwin, Mike J; Amorín, Ricardo; Pérez-Montero, Enrique (21 May 2018). "O/H-N/O: the curious case of NGC 4670". Monthly Notices of the Royal Astronomical Society. 476 (3): 3793–3815. arXiv:1802.04797. doi:10.1093/mnras/sty402.
^ Latimer, Lilikoi J.; Reines, Amy E.; Plotkin, Richard M.; Russell, Thomas D.; Condon, James J. (1 October 2019). "An X-Ray + Radio Search for Massive Black Holes in Blue Compact Dwarf Galaxies". The Astrophysical Journal. 884 (1): 78. arXiv:1907.12585. Bibcode:2019ApJ...884...78L. doi:10.3847/1538-4357/ab3289.
^ Makarov, Dmitry; Karachentsev, Igor (21 April 2011). "Galaxy groups and clouds in the local (z~ 0.01) Universe". Monthly Notices of the Royal Astronomical Society. 412 (4): 2498–2520. arXiv:1011.6277. Bibcode:2011MNRAS.412.2498M. doi:10.1111/j.1365-2966.2010.18071.x. S2CID 119194025.