NGC 4123, UGC 7116, PGC 38531, LEDA 38531, Mrk 1466[9]
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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]
Hubble Space Telescope image of NGC 4123
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]
Radio emission has been detected from an HII nucleus, which is consistent with it having a weak active galactic nucleus.[13] If there is a supermassive black hole at the core, it has an estimated mass of 107M☉.[14]
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NGC4123 is a modest-sized, strongly-barred spiral galaxy located 75 million light-years away in the equatorial constellation of Virgo. It was discovered...
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