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 was discovered by French astronomer Édouard Stephan on 24 July 1879.[4]
NGC 6745 is actually a trio of galaxies in the process of colliding. 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.
Supernovae
Four supernovae have been observed in NGC 6745:
- SN 1999bx (type II, mag. 16.5) was discovered by the Lick Observatory Supernova Search (LOSS) on 26 April 1999.[5][6]
- SN 2022prr (type IIn, mag. 17.3) was discovered by ASAS-SN on 27 July 2022.[7]
- SN 2023ucy (type II, mag. 17.9) was discovered by the Zwicky Transient Facility on 5 October 2023.[8]
- SN 2024ljc (type IIb, mag. 18.736) was discovered by the Zwicky Transient Facility on 15 June 2024.[9]
See also
References
- ^ a b c d e f g h "Results for object NGC 6745". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 2006-11-25.
- ^ "A Bird's Eye View of a Galaxy Collision - Fast Facts". Retrieved 2008-02-26.
- ^ a b 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.
- ^ Seligman, Courtney. "New General Catalogue Objects: NGC 6745". Celestial Atlas. Retrieved 28 August 2024.
- ^ Friedman, A.; Li, W. (1999). "Supernova 1999bx in UGC 11391". International Astronomical Union Circular. 7154: 1. Bibcode:1999IAUC.7154....1F.
- ^ "SN 1999bx". Transient Name Server. IAU. Retrieved 20 May 2025.
- ^ "SN 2022prr". Transient Name Server. IAU. Retrieved 20 May 2025.
- ^ "SN 2023ucy". Transient Name Server. IAU. Retrieved 20 May 2025.
- ^ "SN 2024ljc". Transient Name Server. IAU. Retrieved 20 May 2025.
