NGC 5557
NGC 5557 is quite massive, with a K-band absolute magnitude of −24.8, and is a slow rotator, which suggests it gained mass through dry mergers (galaxy mergers involving galaxies significant amounts of gas). 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). This filamentary structure suggests that NGC 5557 may have formed from a more gas-rich galaxy merger a couple billion years ago. This implies that the galaxy merger would need to have a low impact parameter.
NGC 5557 is part of a galaxy group, and is the largest such galaxy in the group by far. Surrounding the galaxy near the eastern filament are several small bluish objects, which are possibly tidal dwarf galaxies.
Two supernovae have been observed in NGC 5557: SN 1996aa (type Ia, mag. 17), and SN 2013gn (type Ia, mag. 15.3).
References
- ^ Skrutskie, 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. ISSN 0004-6256. S2CID 18913331.
- ^ "NGC 5557". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-04-17.
- ^ Duc, 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 ATLAS 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. S2CID 6762647.
{{cite journal}}:|last10=has generic name (help) - ^ Seligman, Courtney. "New General Catalogue objects: NGC 5550 - 5599". cseligman.com. Retrieved 2021-04-17.
- ^ Bonfini, Paolo (2014). "GALFIT-CORSAIR: Implementing the Core-Sérsic Model into GALFIT". Publications of the Astronomical Society of the Pacific. 126 (944): 935–947. arXiv:1408.6846. Bibcode:2014PASP..126..935B. doi:10.1086/678566. S2CID 119256809.
- ^ Transient Name Server entry for SN 1996aa. Retrieved 30 March 2023.
- ^ Transient Name Server entry for SN 2013gn. Retrieved 30 March 2023.
External links
Media related to NGC 5557 at Wikimedia Commons
