NGC 6745

NGC 6745 (also known as UGC 11391) is an irregular galaxy about 206 million light-years (63.5 mega-parsecs) away in the constellation Lyra. It is actually a trio of galaxies in the process of colliding.

NGC 6745
Irregular Galaxy NGC 6745A with NGC 6745B (bottom right)
Observation data (J2000 epoch)
ConstellationLyra
Right ascension19h 01m 41.7s[1]
Declination+40° 45′ 11″[1]
Redshift4545 ± 60 km/s[1]
Distance206 Mly[2]
Apparent magnitude (V)13.3[1]
Characteristics
TypeS?[1]
Apparent size (V)1.4′[1]
Other designations
UGC 11391,[1] PGC 62691,[1]
Bird's Head,[3] NGC 6745a / 6745b / 6745c[3]

The three galaxies have been colliding for hundreds of millions of years. After passing through the larger galaxy (NGC 6745A), the smaller one (NGC 6745B) is now moving away. The larger galaxy was probably a spiral galaxy before the collision, but was damaged and now appears peculiar. It is unlikely that any stars in the two galaxies collided directly because of the vast distances between them. The gas, dust, and ambient magnetic fields of the galaxies, however, do interact directly in a collision. As a result of this interaction, the smaller galaxy has probably lost most of its interstellar medium to the larger one.

Three supernovae have been observed in NGC 6745: SN 1999bx (type II, mag. 16.5),[4] SN 2022prr (type IIn, mag. 17.3),[5] and SN 2023ucy (type II, mag. 17.9).[6]

See also

References
  1. "NASA/IPAC Extragalactic Database". Results for NGC 6745. Retrieved 2006-11-25.
  2. "A Bird's Eye View of a Galaxy Collision - Fast Facts". Retrieved 2008-02-26.
  3. de Grijs, R.; Anders, P.; Bastian, N.; Lynds, R.; et al. (2003). "Star cluster formation and evolution in nearby starburst galaxies - II. Initial conditions". Monthly Notices of the Royal Astronomical Society. 343 (4): 1285–1300. arXiv:astro-ph/0305184. Bibcode:2003MNRAS.343.1285D. doi:10.1046/j.1365-8711.2003.06777.x. S2CID 16174497.
  4. Transient Name Server entry for SN 1999bx. Retrieved 24 March 2023.
  5. Transient Name Server entry for SN 2022prr. Retrieved 24 March 2023.
  6. Transient Name Server entry for SN 2023ucy. Retrieved 24 October 2023.


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