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NGC 5557 is an elliptical galaxy in the constellationBoötes. It was discovered by William Herschel on May 1, 1785.[4] The distance to NGC 5557 is not well known, but it is estimated to be about 127 million light-years (38.8 megaparsecs) away.[3]
NGC 5557 is quite massive, with a K-band absolute magnitude of −24.8, and is a slow rotator,[3] which suggests it gained mass through dry mergers (galaxy mergers involving galaxies significant amounts of gas).[5] However, it has a faint tidal tail to its east, as well as a more complex structure to the west. This structure, if found to be connected to NGC 5557, would one of the largest around a galaxy, spanning about 1.1 million light-years (350,000 parsecs).[3] This filamentary structure suggests that NGC 5557 may have formed from a more gas-rich galaxy merger a couple billion years ago.[3] This implies that the galaxy merger would need to have a low impact parameter.[5]
NGC 5557 is part of a galaxy group,[3][4] and is the largest such galaxy in the group by far.[3] Surrounding the galaxy near the eastern filament are several small bluish objects, which are possibly tidal dwarf galaxies.[3]
Two supernovae have been observed in NGC 5557: SN 1996aa (type Ia, mag. 17),[6] and SN 2013gn (type Ia, mag. 15.3).[7]
References
^ abSkrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (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. ISSN0004-6256. S2CID18913331.
^ abcdefghiDuc, Pierre-Alain; Cuillandre, Jean-Charles; Serra, Paolo; Michel-Dansac, Leo; Ferriere, Etienne; Alatalo, Katherine; Blitz, Leo; Bois, Maxime; Bournaud, Frédéric; Bureau, Martin; Cappellari, Michele; Davies, Roger L.; Davis, Timothy A.; De Zeeuw, P. T.; Emsellem, Eric; Khochfar, Sadegh; Krajnović, Davor; Kuntschner, Harald; Lablanche, Pierre-Yves; McDermid, Richard M.; Morganti, Raffaella; Naab, Thorsten; Oosterloo, Tom; Sarzi, Marc; Scott, Nicholas; Weijmans, Anne-Marie; Young, Lisa M. (2011). "The ATLAS3D project - IX. The merger origin of a fast- and a slow-rotating early-type galaxy revealed with deep optical imaging: First results". Monthly Notices of the Royal Astronomical Society. 417 (2): 863–881. arXiv:1105.5654. Bibcode:2011MNRAS.417..863D. doi:10.1111/j.1365-2966.2011.19137.x. S2CID6762647.
Media related to NGC 5557 at Wikimedia Commons
This page was last edited on 12 August 2023, at 19:54