NGC 5806 (original) (raw)

From Wikipedia, the free encyclopedia

Spiral galaxy in the constellation Virgo

NGC 5806
NGC 5806, as observed by the Hubble Space Telescope (HST).
Observation data (J2000 epoch)
Constellation Virgo
Right ascension 15h 00m 00.400s[1]
Declination +01° 53′ 28.70″[1]
Redshift 0.00450[2]
Heliocentric radial velocity 1346 ± 21 km/s[2]
Distance 68 Mly (21 Mpc)[3]
Apparent magnitude (V) 11.70[3]
Apparent magnitude (B) 12.40[3]
Characteristics
Type SAB(s)b[1][3]
Apparent size (V) 3.1′ × 1.6′[3]
Other designations
UGC 9645, MCG +00-38-014, PGC 53578[2]

NGC 5806 is an intermediate spiral galaxy in the constellation Virgo. It was discovered on February 24, 1786, by the astronomer John Herschel.[4] It is located about 70 million light-years (or about 21 Megaparsecs) away from the Milky Way.[3] It is a member of the NGC 5846 Group.[2]

NGC 5806 contains a star that was catalogued as a supernova (SN Hunt 248), but turned out to be a supernova imposter. The progenitor was detected as a cool hypergiant with an absolute visual magnitude of −9 and 400,000 times more luminous than the sun. The eruption saw it increase in luminosity to around 80,000,000 L☉.[5]

Supernova SN 2004dg in NGC 5806

NGC 5806 has also hosted several true supernovae. SN 2004dg (type II, mag. 17.1)[6] was around 100 times brighter than SN Hunt 248. The progenitor of SN 2004dg has not been detected and is expected to have been a relatively low mass, low luminosity, red supergiant.[7] The other supernovae are SN 2012P (type IIb, mag. 15)[8] and iPTF13bvn (type Ib, mag. 17.2), which was discovered on 16 June 2013.[9]

  1. ^ a b c "Results for object NGC 5806 (NGC 5806)". NASA/IPAC Extragalactic Database. California Institute of Technology. Retrieved 2021-02-21.
  2. ^ a b c d "NGC 5806". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-21.
  3. ^ a b c d e f Gil de Paz, Armando; et al. (December 2007). "The GALEX Ultraviolet Atlas of Nearby Galaxies". The Astrophysical Journal Supplement Series. 173 (2): 185–255. arXiv:astro-ph/0606440. Bibcode:2007ApJS..173..185G. doi:10.1086/516636. S2CID 119085482.
  4. ^ Seligman, Courtney. "New General Catalogue objects: NGC 5800 - 5849". cseligman.com. Retrieved 2021-02-21.
  5. ^ Mauerhan, Jon C.; Van Dyk, Schuyler D.; Graham, Melissa L.; Zheng, Weikang; Clubb, Kelsey I.; Filippenko, Alexei V.; Valenti, Stefano; Brown, Peter; Smith, Nathan; Howell, D. Andrew; Arcavi, Iair (2015). "SN Hunt 248: A super-Eddington outburst from a massive cool hypergiant". Monthly Notices of the Royal Astronomical Society. 447 (2): 1922. arXiv:1407.4681. Bibcode:2015MNRAS.447.1922M. doi:10.1093/mnras/stu2541. S2CID 11415725.
  6. ^ "SN 2004dg". Transient Name Server. IAU. Retrieved 22 August 2024.
  7. ^ Smartt, S. J.; Eldridge, J. J.; Crockett, R. M.; Maund, J. R. (2009). "The death of massive stars - I. Observational constraints on the progenitors of Type II-P supernovae". Monthly Notices of the Royal Astronomical Society. 395 (3): 1409. arXiv:0809.0403. Bibcode:2009MNRAS.395.1409S. doi:10.1111/j.1365-2966.2009.14506.x. S2CID 3228766.
  8. ^ "SN 2012P". Transient Name Server. IAU. Retrieved 22 August 2024.
  9. ^ Fremling, C.; Sollerman, J.; Taddia, F.; Ergon, M.; Fraser, M.; Karamehmetoglu, E.; Valenti, S.; Jerkstrand, A.; Arcavi, I.; Bufano, F.; Elias Rosa, N.; Filippenko, A. V.; Fox, D.; Gal-Yam, A.; Howell, D. A.; Kotak, R.; Mazzali, P.; Milisavljevic, D.; Nugent, P. E.; Nyholm, A.; Pian, E.; Smartt, S. (2016). "PTF12os and iPTF13bvn". Astronomy & Astrophysics. 593: A68. arXiv:1606.03074. doi:10.1051/0004-6361/201628275. S2CID 54028503.