Astronomy:NGC 5557

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Short description: Galaxy in the constellation Boötes

Coordinates: Sky map 14h 18m 25.708s, +36° 29′ 37.28″

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NGC5557 - SDSS DR14.jpg
SDSS image of NGC 5557
Observation data (J2000 epoch)
ConstellationBoötes
Right ascension 14h 18m 25.708s[1]
Declination+36° 29′ 37.28″[1]
Redshift0.010764[2]
Helio radial velocity3210 ± 28 km/s[2]
Apparent magnitude (V)12.2[3]
Absolute magnitude (V)−22.39[4]
Characteristics
TypeE1[5]
Other designations
UGC 9161, MCG+06-31-093, PGC 51104[2]

NGC 5557 is an elliptical galaxy in the constellation Boötes. It was discovered by William Herschel on May 1, 1785.[3] The distance to NGC 5557 is not well known, but it is estimated to be about 127 million light-years (38.8 megaparsecs) away.[5]

NGC 5557 is quite massive, with a K-band absolute magnitude of −24.8, and is a slow rotator,[5] which suggests it gained mass through dry mergers (galaxy mergers involving galaxies significant amounts of gas).[4] 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).[5] This filamentary structure suggests that NGC 5557 may have formed from a more gas-rich galaxy merger a couple billion years ago.[5] This implies that the galaxy merger would need to have a low impact parameter.[4]

NGC 5557 is part of a galaxy group,[5][3] and is the largest such galaxy in the group by far.[5] Surrounding the galaxy near the eastern filament are several small bluish objects, which are possibly tidal dwarf galaxies.[5]

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

  1. ↑ 1.0 1.1 Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W. et al. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal 131 (2): 1163–1183. doi:10.1086/498708. ISSN 0004-6256. Bibcode: 2006AJ....131.1163S. https://ui.adsabs.harvard.edu/abs/2006AJ....131.1163S/abstract. 
  2. ↑ 2.0 2.1 2.2 "NGC 5557". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+5557. 
  3. ↑ 3.0 3.1 3.2 Seligman, Courtney. "New General Catalogue objects: NGC 5550 - 5599". http://cseligman.com/text/atlas/ngc55a.htm#5557. 
  4. ↑ 4.0 4.1 4.2 Bonfini, Paolo (2014). "GALFIT-CORSAIR: Implementing the Core-Sérsic Model into GALFIT". Publications of the Astronomical Society of the Pacific 126 (944): 935–947. doi:10.1086/678566. Bibcode: 2014PASP..126..935B. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 Cite error: Invalid <ref> tag; no text was provided for refs named Duc
  6. ↑ Transient Name Server entry for SN 1996aa. Retrieved 30 March 2023.
  7. ↑ Transient Name Server entry for SN 2013gn. Retrieved 30 March 2023.

External links



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