NGC 4123, UGC 7116, PGC 38531, LEDA 38531, Mrk 1466[9]
NGC 4123 is a modest-sized,[10] strongly-barred spiral galaxy[7] located 75 million light-years[4] away in the equatorial constellation of Virgo. It was discovered February 25, 1784 by William Herschel.[5] This is a member of the Virgo cluster, and it belongs to a group of three galaxies.[11] A companion galaxy, NGC 4116, lies at an angular separation of 14′ to the southwest. There is no indication of an interaction between the two galaxies.[7] The third member of the group is NGC 4179.[11]
The morphological classification of NGC 4123 is SBx(rs)ab, which indicates this is a spiral galaxy with a central X-shaped bar (SBx) encircled by an incomplete ring structure (rs) and moderate to tightly wound spiral arms (ab). The plane of the galaxy is inclined at an angle of 46.9° to the line of sight from the Earth. It lacks a large spheroidal bulge at the core, showing only a luminous point-like source.[10] Blue knots in the outer spiral arms indicate that star formation is ongoing.[7] The galaxy has a stellar mass of 1.95×1010M☉[6] with a star formation rate of 3.429±3.281 M☉·yr−1.[12] The atomic gas in the galaxy has a mass of 1.06×1010M☉.[10]
^ abVallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^Abazajian, Kevork N.; et al. (2009), "The Seventh Data Release of the Sloan Digital Sky Survey", The Astrophysical Journal Supplement Series, 182 (2): 543–558, arXiv:0812.0649, Bibcode:2009ApJS..182..543A, doi:10.1088/0067-0049/182/2/543, S2CID 14376651.
^ abVoyer, E. N.; et al. (September 2014), "The GALEX Ultraviolet Virgo Cluster Survey (GUViCS). III. The ultraviolet source catalogs", Astronomy & Astrophysics, 569: A124, arXiv:1405.4344, Bibcode:2014A&A...569A.124V, doi:10.1051/0004-6361/201322511, S2CID 118455940, A124.
^ abHaynes, Martha P.; et al. (July 2018), "The Arecibo Legacy Fast ALFA Survey: The ALFALFA Extragalactic H I Source Catalog", The Astrophysical Journal, 861 (1): 49, arXiv:1805.11499, Bibcode:2018ApJ...861...49H, doi:10.3847/1538-4357/aac956, 49.
^ abDíaz-García, S.; et al. (October 2021), "Molecular gas and star formation within 12 strong galactic bars observed with IRAM-30 m", Astronomy & Astrophysics, 654: A135, arXiv:2106.13099, Bibcode:2021A&A...654A.135D, doi:10.1051/0004-6361/202140674, S2CID 235624019, A135.
^ abcdWeiner, Benjamin J.; Williams, T. B.; van Gorkom, J. H.; Sellwood, J. A. (January 2001), "The Disk and Dark Halo Mass of the Barred Galaxy NGC 4123. I. Observations", The Astrophysical Journal, 546 (2): 916–930, arXiv:astro-ph/0008204, Bibcode:2001ApJ...546..916W, doi:10.1086/318288, S2CID 13742393.
^Skrutskie, Michael F.; et al. (1 February 2006), "The Two Micron All Sky Survey (2MASS)", The Astronomical Journal, 131 (2): 1163–1183, Bibcode:2006AJ....131.1163S, doi:10.1086/498708, ISSN 0004-6256, S2CID 18913331.
^ abcWeiner, Benjamin J.; et al. (January 2001), "The Disk and Dark Halo Mass of the Barred Galaxy NGC 4123. II. Fluid-Dynamical Models", The Astrophysical Journal, 546 (2): 931–951, arXiv:astro-ph/0008205, Bibcode:2001ApJ...546..931W, doi:10.1086/318289, S2CID 119068977.
^Lianou, S.; et al. (November 2019), "Dust properties and star formation of approximately a thousand local galaxies", Astronomy & Astrophysics, 631: A38, arXiv:1906.02712, Bibcode:2019A&A...631A..38L, doi:10.1051/0004-6361/201834553, S2CID 174801441, A38.
^Ulvestad, James S.; Ho, Luis C. (December 2002), "A Search for Active Galactic Nuclei in Sc Galaxies with H II Spectra", The Astrophysical Journal, 581 (2): 925–931, arXiv:astro-ph/0208460, Bibcode:2002ApJ...581..925U, doi:10.1086/344442, S2CID 15482628.
^Dong, X. Y.; De Robertis, M. M. (March 2006), "Low-Luminosity Active Galaxies and Their Central Black Holes", The Astronomical Journal, 131 (3): 1236–1252, arXiv:astro-ph/0510694, Bibcode:2006AJ....131.1236D, doi:10.1086/499334, S2CID 17630682.
Further reading
Weiner, B. J.; et al. (1996), Buta, R.; et al. (eds.), "Fabry-Perot Observations and Hydrodynamical Simulations of the Barred Spiral NGC 4123", Barred galaxies; Proceedings of a conference held at the University of Alabama; Tuscaloosa; Alabama; 30 May - 3 June 1995, Astronomical Society of the Pacific Conference Series, vol. 91, San Francisco: Astronomical Society of the Pacific, p. 489, Bibcode:1996ASPC...91..489W.
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