ESO 323- G 074,IRAS 13012-4108,MCG -07-27-029,PGC 45155[1]
NGC 4930 is abarred spiral galaxy in the constellationCentaurus. The galaxy lies about 80 millionlight years away from Earth, which means, given its apparent dimensions, that NGC 4930 is approximately 80,000 light years across.[1] It was discovered byJohn Herschel on June 8, 1834.[3]
NGC 4930 is a barred spiral galaxy with a prominent long bar. The nucleus is small and bright and thebulge is elliptical. At the end of the bar a ring has been formed which is slightly brighter at the points it intersects with the bar. Faint arms emerge from the ring.[4] The kinematics and hydrogen distribution of the galaxy as observed inhydrogen line appear relatively normal.[5] Thestar formation rate of the galaxy is estimated to be about 1M☉ per year.[6] In the centre of the galaxy lies asupermassive black hole, whose mass is estimated to be 106.33 ± 0.38 (0.9 - 5.1 millions)M☉, based on the pitch angle of the spiral arms.[7]
NGC 4930 is the foremost member of the NGC 4930 Group, also known as LGG 325.[8] Other members of the group include ESO 323- 55, ESO 323- 62, ESO 323- 67, ESO 323- 58 accoring to A. M. Garcia,[9] while Makarov et al consider the galaxies ESO 323-55, ESO 323-58, ESO 323-59, ESO 323-67, and ESO 323-75.[8] Crook et al considers the galaxy to form a triplet with galaxies ESO 323-60 and ESO 323-62.[10] The group lies at the same cloud with theCentaurus Cluster,[8] which lies at a projected distance of 2.5° to the west in the sky.[11]
^Eskridge, Paul B.; Frogel, Jay A.; Pogge, Richard W.; Quillen, Alice C.; Berlind, Andreas A.; Davies, Roger L.; DePoy, D. L.; Gilbert, Karoline M.; Houdashelt, Mark L.; Kuchinski, Leslie E.; Ramirez, Solange V.; Sellgren, K.; Stutz, Amelia; Terndrup, Donald M.; Tiede, Glenn P. (November 2002). "Near‐Infrared and Optical Morphology of Spiral Galaxies".The Astrophysical Journal Supplement Series.143 (1):73–111.doi:10.1086/342340.
^Pisano, D. J.; Wilcots, Eric M.; Liu, Charles T. (October 2002). "An H i /Optical Atlas of Isolated Galaxies".The Astrophysical Journal Supplement Series.142 (2):161–222.doi:10.1086/341787.
^Davis, Benjamin L.; Berrier, Joel C.; Johns, Lucas; Shields, Douglas W.; Hartley, Matthew T.; Kennefick, Daniel; Kennefick, Julia; Seigar, Marc S.; Lacy, Claud H. S. (20 June 2014). "The Black Hole Mass Function Derived from Local Spiral Galaxies".The Astrophysical Journal.789 (2): 124.arXiv:1405.5876.Bibcode:2014ApJ...789..124D.doi:10.1088/0004-637X/789/2/124.S2CID119302157.
