NGC 2207 and IC 2163

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NGC 2207 / IC 2163
A Hubble Space Telescope (HST) image of NGC 2207 and IC 2163.
Observation data (J2000 epoch)
Constellation Canis Major
Right ascension 06h 16m 22.0s / 06h 16m 28.0s[1]
Declination −21° 22′ 22″ / −21° 22′ 33″[1]
Redshift 2741 ± 15 / 2765 ± 20 km/s[1]
Distance 81 ± 39 Mly
(24.9 ± 12 Mpc)[2]
Type SAB(rs)bc pec / SB(rs)c pec[1]
Apparent dimensions (V) 4′.3 × 2′.8 / 3′.0 × 1′.2[1]
Apparent magnitude (V) 12.2 / 11.6[1]
Notable features colliding galaxies
Other designations
RR59 132,[citation needed] PGC 18749 / 18751[1]
See also: Galaxy, List of galaxies

NGC 2207 and IC 2163 are a pair of colliding spiral galaxies about 80 million light-years away[2] in the constellation Canis Major. Both galaxies were discovered by John Herschel in 1835. So far four supernovae have been observed in NGC 2207 (type Ia SN 1975a in January 1975,[3] type Ib SN 1999ec in October 1999,[4] type Ib SN 2003H—discovered halfway between the two galaxies.[5] and type II supernova SN 2013ai in March 2013.[6] NGC 2207 is in the process of tidally stripping IC 2163.

Merging galaxies[edit]

NGC 2207 is in the process of colliding and merging with IC 2163. But unlike the Antennae or the Mice Galaxies, they are still two separate spiral galaxies. They are only in the first step of colliding and merging. Soon they will collide, probably looking a bit more like the Mice Galaxies. In about a billion years time they are expected to merge and become an elliptical galaxy or perhaps a disk galaxy.[7]


See also[edit]


  1. ^ a b c d e f g "NASA/IPAC Extragalactic Database". Results for NGC 2207 / IC 2163. Retrieved 2006-11-25. 
  2. ^ a b "Distance Results for NGC 2207". NASA/IPAC Extragalactic Database. Retrieved 2010-05-22. 
  3. ^ Kirshner, Robert P.; Arp, H.C.; Dunlap, J.R. (1976). "Observations of Supernovae - 1975a in NGC 2207 and 1975b in the Perseus Cluster". Astrophysical Journal 207 (1): 44–52. Bibcode:1976ApJ...207...44K. doi:10.1086/154465. 
  4. ^ Jha, S.; Garnavich, P.; Challis, P.; Kirshner, R.; Berlind, P. (1999). "Supernova 1999ec in NGC 2207". IAUC 7269: 2. Bibcode:1999IAUC.7269....2J. 
  5. ^ van den Bergh, Sidney; Li, Weidong; Filippenko, Alexei V. (2003). "Classifications of the Host Galaxies of Supernovae, Set II". The Publications of the Astronomical Society of the Pacific 115 (813): 1280–88. arXiv:astro-ph/0308195. Bibcode:2003PASP..115.1280V. doi:10.1086/379106. 
  6. ^ Conseil, E.; Fraser, M.; Inserra, C.; Walton, N.; Blagorodnova, N.; Nicholl, M.; Benetti, S.; Pastorello, A.; Valenti, S.; Taubenberger, S.; Smartt, S.J.; Smith, K.; Young, D.; Sullivan, M.; Gal-Yam, A.; Yaron, O. (2013). "Supernova 2013ai in NGC 2207 = Psn J06161835-2122329". Central Bureau Electronic Telegrams (3431): 1. Bibcode:2013CBET.3431....1C. 
  7. ^ Junko Ueda et al. "Cold molecular gas in merger remnants. I. Formation of molecular gas disks". The Astrophysical Journal Supplement Series 214 (1). doi:10.1088/0067-0049/214/1/1. 

Further reading[edit]

External links[edit]