Astronomy:NGC 5806

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NGC 5806
NGC 5806 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationVirgo
Right ascension 15h 00m 00.4123s[1]
Declination+01° 53′ 28.756″[1]
Redshift0.004493[1]
Helio radial velocity1346 ± 21 km/s[2]
Distance68 Mly (21 Mpc)[3]
Group or clusterNGC 5806 Group (LGG 392)[4]
Apparent magnitude (V)11.70[3]
Apparent magnitude (B)12.40[3]
Characteristics
TypeSAB(s)b[1][3]
Size~73,900 ly (22.65 kpc) (estimated)[1]
Apparent size (V)3.1′ × 1.6′[3]
Other designations
IRAS 14574+0205, UGC 9645, MCG+00-38-014, PGC 53578[2][1]

NGC 5806 is an intermediate spiral galaxy in the constellation Virgo. It was discovered by German-British astronomer William Herschel on 24 February 1786.[5] It is located about 70 million light-years (21 Megaparsecs) away from the Milky Way.[3] It is a member of the NGC 5846 Group.[2]

Supernovae and Imposter

Supernova SN 2004dg in NGC 5806

Three supernovae and one supernova imposter have been observed in NGC 5806:

  • SN 2004dg (Type II, mag. 17.1) was discovered by Associazione Ternana Astrofili on 19 July 2004.[6][7] The progenitor of SN 2004dg has not been detected and is expected to have been a relatively low mass, low luminosity, red supergiant.[8]
  • SN 2012P (Type IIb, mag. 15.0) was discovered by Fabio Briganti on 22 January 2012.[9][10] Originally classified as a Type Ib/c, it was later determined to be Type IIb.[11] Later analysis concluded that the progenitor had an initial mass of 15.2 M☉.[12]
  • iPTF13bvn (Type Ib, mag. 17.2) was discovered by the Palomar Transient Factory on 16 June 2013.[13][14]
  • SN Hunt 248 (also known as AT 2014ib) was discovered by the Catalina Real-time Transient Survey and Stan Howerton on 21 May 2014. It was initially catalogued as a supernova, but was later classified as 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☉.[15] Later analysis concluded that this object is a luminous red nova.[16][17]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "Results for object NGC 5806". California Institute of Technology. https://ned.ipac.caltech.edu/byname?objname=NGC+5806. Retrieved 2021-02-21. 
  2. ↑ 2.0 2.1 2.2 "NGC 5806". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+5806. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Gil de Paz, Armando et al. (December 2007). "The GALEX Ultraviolet Atlas of Nearby Galaxies". The Astrophysical Journal Supplement Series 173 (2): 185–255. doi:10.1086/516636. Bibcode: 2007ApJS..173..185G. 
  4. ↑ Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series 100: 47. Bibcode: 1993A&AS..100...47G. 
  5. ↑ Seligman, Courtney. "New General Catalogue objects: NGC 5800 - 5849". http://cseligman.com/text/atlas/ngc58.htm#5806. Retrieved 2021-02-21. 
  6. ↑ Vagnozzi, A.; De Pasquale, D.; Guerri, F.; Guerri, G.; Cristofanelli, M.; Romanelli, S.; Valentini, S.; Yamaoka, H. et al. (July 2004). "Supernova 2004dg". International Astronomical Union Circular (International Astronomical Union) (8375). Bibcode: 2004IAUC.8375....1V. http://www.cbat.eps.harvard.edu/iauc/08300/08375.html#Item1. 
  7. ↑ "SN 2004dg". IAU. https://www.wis-tns.org/object/2004dg. 
  8. ↑ 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. doi:10.1111/j.1365-2966.2009.14506.x. Bibcode: 2009MNRAS.395.1409S. 
  9. ↑ Dimai, A.; Briganti, F.; Brimacombe, J. (2012). "Supernova 2012P in NGC 5806 = PSN J14595904+0153251". Central Bureau Electronic Telegrams (2993): 1. Bibcode: 2012CBET.2993....1D. http://www.cbat.eps.harvard.edu/iau/cbet/002900/CBET002993.txt. 
  10. ↑ "SN 2012P". IAU. https://www.wis-tns.org/object/2012P. 
  11. ↑ Arcavi, Iair; Gal-Yam, Avishay; Ben-Ami, Sagi; Fox, Derek; Kasliwal, Mansi; Nugent, Peter; Howell, D. Andrew; Parrent, Jerod et al. (2012). "PTF12os / PSN J14595904+0153251 is a Type IIb Supernova". The Astronomer's Telegram 3881: 1. Bibcode: 2012ATel.3881....1A. https://www.astronomerstelegram.org/?read=3881. 
  12. ↑ Sun, Ning-Chen; Maund, Justyn R.; Crowther, Paul A.; Fang, Xuan; Zapartas, Emmanouil (2021). "Towards a better understanding of supernova environments: A study of SNe 2004dg and 2012P in NGC 5806 with HST and MUSE". Monthly Notices of the Royal Astronomical Society 504 (2): 2253. doi:10.1093/mnras/stab994. Bibcode: 2021MNRAS.504.2253S. 
  13. ↑ Cao, Y.; Gorbikov, E.; Arcavi, I.; Ofek, E.; Gal-Yam, A.; Nugent, P.; Kasliwal, M. (2013). "IPTF discovery of a young SN candidate at z=0.00449". The Astronomer's Telegram 5137: 1. Bibcode: 2013ATel.5137....1C. https://www.astronomerstelegram.org/?read=5137. 
  14. ↑ Fremling, C.; Sollerman, J.; Taddia, F.; Ergon, M.; Fraser, M.; Karamehmetoglu, E.; Valenti, S.; Jerkstrand, A. et al. (2016). "PTF12os and iPTF13bvn". Astronomy & Astrophysics 593: A68. doi:10.1051/0004-6361/201628275. 
  15. ↑ Mauerhan, Jon C.; Van Dyk, Schuyler D.; Graham, Melissa L.; Zheng, Weikang; Clubb, Kelsey I.; Filippenko, Alexei V.; Valenti, Stefano; Brown, Peter et al. (2015). "SN Hunt 248: A super-Eddington outburst from a massive cool hypergiant". Monthly Notices of the Royal Astronomical Society 447 (2): 1922. doi:10.1093/mnras/stu2541. Bibcode: 2015MNRAS.447.1922M. 
  16. ↑ "Classification certificate for object 2014ib". IAU. https://www.wis-tns.org/object/2014ib/classification-cert. 
  17. ↑ Mauerhan, Jon C.; Van Dyk, Schuyler D.; Johansson, Joel; Fox, Ori D.; Filippenko, Alexei V.; Graham, Melissa L. (2018). "The dusty aftermath of SN Hunt 248: Merger-burst remnant?". Monthly Notices of the Royal Astronomical Society 473 (3): 3765. doi:10.1093/mnras/stx2500. Bibcode: 2018MNRAS.473.3765M. 



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