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NGC 5557 is an elliptical galaxy in the constellation Boötes. 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
SDSS image of NGC 5557
Observation data (J2000 epoch)
ConstellationBoötes
Right ascension14h 18m 25.708s[1]
Declination+36° 29′ 37.28″[1]
Redshift0.010764[2]
Helio radial velocity3210 ± 28 km/s[2]
Distance127 Mly (38.8 Mpc)[3]
Apparent magnitude (V)12.2[4]
Absolute magnitude (V)−22.39[5]
Characteristics
TypeE1[3]
Other designations
UGC 9161, MCG +06-31-093, PGC 51104[2]

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]


References


  1. 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: 1163–1183. doi:10.1086/498708. ISSN 0004-6256.
  2. "NGC 5557". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-04-17.
  3. 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 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. S2CID 6762647.
  4. Seligman, Courtney. "New General Catalogue objects: NGC 5550 - 5599". cseligman.com. Retrieved 2021-04-17.
  5. 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.



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[de] NGC 5557

NGC 5557 ist eine Elliptische Galaxie vom Hubble-Typ E1 im Sternbild Bärenhüter am Nordsternhimmel. Sie ist schätzungsweise 147 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 100.000 Lichtjahren. Gemeinsam mit fünf weiteren Galaxien bildet sie die NGC 5557-Gruppe (LGG 378). Im selben Himmelsareal befinden sich u. a. die Galaxien NGC 5529, NGC 5544, NGC 5545, NGC 5572.
- [en] NGC 5557

[ru] NGC 5557

NGC 5557 (другие обозначения — UGC 9161, MCG 6-31-93, ZWG 191.74, PGC 51104) — эллиптическая галактика (E1) в созвездии Волопас.


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