NGC 7205 is a spiral galaxy in the constellation Indus. The galaxy lies about 60 million light years away from Earth based on redshift independent methods, which means, given its apparent dimensions, that NGC 7205 is approximately 70,000 light years across.[1] It was discovered by John Herschel on June 10, 1834.[3]
Although the galaxy is characterised as unbarred, Eskridge found evidence that the galaxy has a weak bar. The galaxy has two spiral arms arranged in a grand design pattern. The arms can be traced for a full revolution, but both arms appear to branch after completing half a revolution.[4] The galaxy is asymmetric. The HII regions at the north and eastern parts of the galaxy are more luminous in H-alpha than the rest. They appear to be complex, being composed from multiple star formation regions.[5] The largest of the HII regions are 3 arcseconds across.[6] In the centre of the galaxy lies a supermassive black hole, whose mass is estimated to be 106.68 ± 0.41 (2 - 12 millions) M☉, based on the pitch angle of the spiral arms.[7]
NGC 7205 forms a non interacting pair with NGC 7205A, lying 8.5 arcminutes away.[8] NGC 7205 is a member of the Telescopium−Grus Cloud.[9]
References
- ^ a b c d e f g h i j "NASA/IPAC Extragalactic Database". Results for NGC 7205. Retrieved 5 March 2025.
- ^ "Revised NGC Data for NGC 7205". spider.seds.org. Retrieved 30 March 2024.
- ^ Seligman, Courtney. "NGC 7205 (= PGC 68128)". Celestial Atlas. Retrieved 19 November 2018.
- ^ 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. arXiv:astro-ph/0206320. doi:10.1086/342340.
- ^ Ryder, Stuart D.; Dopita, Michael A. (October 1993). "An H-alpha atlas of nearby southern spiral galaxies". The Astrophysical Journal Supplement Series. 88: 415. doi:10.1086/191827.
- ^ Sandage, A., Bedke, J. (1994), The Carnegie Atlas of Galaxies. Volume I, Carnegie Institution of Washington
- ^ 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. S2CID 119302157.
- ^ de Vaucouleurs, Gerard Henri; de Vaucouleurs, Antoinette; Shapley, Harlow (1964). Reference catalogue of bright galaxies. Austin: University of Texas Press. Bibcode:1964rcbg.book.....D.
- ^ Tully, R. Brent (1988). Nearby galaxies catalog. Cambridge: Cambridge University Press. ISBN 0-521-35299-1. OCLC 16524318.
External links
- NGC 7205 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
