Wikipedia

NGC 1084

NGC 1084 is an unbarred spiral galaxy in the constellation Eridanus. It is located at a distance of about 63 million light-years away from the Milky Way. The galaxy was discovered by William Herschel on 10 January 1785. It has multiple spiral arms, which are not well defined.[6] It belongs in the same galaxy group with NGC 988, NGC 991, NGC 1022, NGC 1035, NGC 1042, NGC 1047, NGC 1052 and NGC 1110. This group is in turn associated with the Messier 77 group.[7]

NGC 1084
NGC 1084 imaged by the Hubble Space Telescope in 2001
Observation data (J2000 epoch)
ConstellationEridanus
Right ascension02h 45m 59.926s[1]
Declination−07° 34′ 43.10″[1]
Redshift1,406 km/s[2]
Distance62.7 Mly (19.23 Mpc)[2]
Apparent magnitude (V)10.7
Characteristics
TypeSAc[3][4]
Apparent size (V)3.2′ × 1.8′[3]
Other designations
LEDA 10464, MCG-01-08-007[5] PGC 10464[3]

Star formation in the galaxy is chaotic and not confined to the spiral arms, but the rate is not high enough to classify it as a starburst galaxy. Star formation has taken place in small bursts in the last 40 million years. The cause of this activity has been proposed as a merger with a gas-rich dwarf galaxy. A radio source has been detected 3.5' south-west of the galaxy, connected to it by a bridge.[8]

Supernovae

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Five supernovae have been observed in NGC 1084:[9][10]

  • SN 1963P (type Ia, mag. 14.5) was discovered by Paul Wild on 18 September 1963.[11][12]
  • SN 1996an (type II, mag. 14) was discovered by Masakatsu Aoki on 27 July 1996.[13][14]
  • SN 1998dl (Type II, mag. 16) was discovered by the Lick Observatory Supernova Search (LOSS) on 20 August 1998.[15][16]
  • SN 2009H (Type II, mag. 17.4) was discovered by the Lick Observatory Supernova Search (LOSS) on 2 January 2009.[17][18]
  • SN 2012ec (Type IIP, mag. 14.5) was discovered by Berto Monard on 11 August 2012.[19][20]
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References

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  1. ^ a b 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.
  2. ^ a b Tully, R. Brent; et al. (2016). "Cosmicflows-3". The Astronomical Journal. 152 (2): 21. arXiv:1605.01765. Bibcode:2016AJ....152...50T. doi:10.3847/0004-6256/152/2/50. S2CID 250737862. 50.
  3. ^ a b c "NASA/IPAC Extragalactic Database". Results for NGC 1084. Retrieved 2016-01-02.
  4. ^ Ann, H. B.; et al. (2015). "A Catalog of Visually Classified Galaxies in the Local (z ~ 0.01) Universe". The Astrophysical Journal Supplement Series. 217 (2): 27–49. arXiv:1502.03545. Bibcode:2015ApJS..217...27A. doi:10.1088/0067-0049/217/2/27. S2CID 119253507.
  5. ^ "NGC 1084". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-04-07.
  6. ^ Eskridge, Paul B.; et al. (November 2002). "Near-Infrared and Optical Morphology of Spiral Galaxies". The Astrophysical Journal Supplement Series. 143 (1): 73–111. arXiv:astro-ph/0206320. Bibcode:2002ApJS..143...73E. doi:10.1086/342340. S2CID 15491635.
  7. ^ Makarov, Dmitry; Karachentsev, Igor (2011). "Galaxy groups and clouds in the local (z~ 0.01) Universe". Monthly Notices of the Royal Astronomical Society. 412 (4): 2498–2520. arXiv:1011.6277. Bibcode:2011MNRAS.412.2498M. doi:10.1111/j.1365-2966.2010.18071.x. S2CID 119194025.
  8. ^ Ramya, S.; et al. (October 2007). "Study of star formation in NGC 1084". Monthly Notices of the Royal Astronomical Society. 381 (2): 511–524. arXiv:0707.2366. Bibcode:2007MNRAS.381..511R. doi:10.1111/j.1365-2966.2007.12232.x. S2CID 16910522.
  9. ^ "List of Supernovae". IAU Central Bureau for Astronomical Telegrams. Retrieved 29 December 2015.
  10. ^ "A spiral home to exploding stars". Hubble Space Telescope. 31 March 2014.
  11. ^ Thernoe, K. A. (1 October 1963). "Circular No. 1843". Central Bureau for Astronomical Telegrams. Observatory Copenhagen. Retrieved 1 December 2024.
  12. ^ "SN 1963P". Transient Name Server. IAU. Retrieved 17 August 2024.
  13. ^ Nakano, S.; Aoki, M.; Kushida, Y.; Kushida, R.; Benetti, S.; Turatto, M.; Van De Steene, G. (1996). "Supernova 1996an in NGC 1084". International Astronomical Union Circular (6442): 1. Bibcode:1996IAUC.6442....1N.
  14. ^ "SN 1996an". Transient Name Server. IAU. Retrieved 17 August 2024.
  15. ^ King, J. Y.; Modjaz, M.; Shefler, T.; Halderson, E.; Li, W. D.; Treffers, R. R.; Filippenko, A. V. (1998). "Supernova 1998dl in NGC 1084". International Astronomical Union Circular (6992): 1. Bibcode:1998IAUC.6992....1K.
  16. ^ "SN 1998dl". Transient Name Server. IAU. Retrieved 17 August 2024.
  17. ^ Li, W.; Cenko, S. B.; Filippenko, A. V. (2009). "Supernova 2009H in NGC 1084". Central Bureau Electronic Telegrams. 1656: 1. Bibcode:2009CBET.1656....1L.
  18. ^ "SN 2009H". Transient Name Server. IAU. Retrieved 16 August 2024.
  19. ^ Monard, L. A. G.; Childress, M.; Scalzo, R.; Yuan, F.; Schmidt, B. (2012). "Supernova 2012ec in NGC 1084 = PSN J02455988-0734270". Central Bureau Electronic Telegrams. 3201: 1. Bibcode:2012CBET.3201....1M.
  20. ^ "SN 2012ec". Transient Name Server. IAU. Retrieved 16 August 2024.
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