NGC 6745 explained

NGC 6745
Epoch:J2000
Type:S?[1]
Dist Ly:206 Mly[2]
Z:4545 ± 60 km/s
Appmag V:13.3
Size V:1.4
Constellation Name:Lyra
Names:UGC 11391, PGC 62691,
Bird's Head,[3] NGC 6745a / 6745b / 6745c

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.

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.

Four supernovae have been observed in NGC 6745: SN 1999bx (type II, mag. 16.5),[4] SN 2022prr (type IIn, mag. 17.3),[5] SN 2023ucy (type II, mag. 17.9),[6] and SN 2024ljc (type IIb, mag. 18.7).[7]

See also

External links

Notes and References

  1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 6745 . 2006-11-25 .
  2. Web site: A Bird's Eye View of a Galaxy Collision - Fast Facts. 2008-02-26.
  3. de Grijs, R. . 4 . Anders, P. . Bastian, N. . Lynds, R. . Lamers, H. J. G. L. M. . O'Neil, E. J. . Star cluster formation and evolution in nearby starburst galaxies - II. Initial conditions . Monthly Notices of the Royal Astronomical Society . 2003 . 343 . 4 . 1285–1300 . 2003MNRAS.343.1285D . 10.1046/j.1365-8711.2003.06777.x . free . astro-ph/0305184 . 16174497 .
  4. https://www.wis-tns.org/object/1999bx Transient Name Server entry for SN 1999bx.
  5. https://www.wis-tns.org/object/2022prr Transient Name Server entry for SN 2022prr.
  6. https://www.wis-tns.org/object/2023ucy Transient Name Server entry for SN 2023ucy.
  7. https://www.wis-tns.org/object/2024ljc Transient Name Server entry for SN 2024ljc.