UGC 7069
| UGC 7069 | |
|---|---|
 UGC 7069 from the Legacy Survey DR10 | |
| Observation data | |
| Constellation | Ursa Major |
| Right ascension | 12:04:57.9 |
| Declination | +43:08:59.0 |
| Redshift | 0.052 z |
| Distance | 233.16 ± 16.32 Mpc (760 ± 53 Mly) |
| Absolute magnitude (B) | 15.70 |
| Characteristics | |
| Type | Ring galaxy |
| Size | 388,885 ly (119.29 kpc) (estimated) |
| Notable features | Largest ring galaxy |
| Other designations | |
| PGC 38254 | |
UGC 7069 is a very large ring galaxy located about 760 million light years from Earth in the constellation of Ursa Major. It is currently the largest ring galaxy discovered with a diameter of approximately 115 kiloparsecs (~390,000 light-years) making it twice the diameter of the Cartwheel Galaxy which for reference has a diameter of roughly 45.9 kiloparsecs. It is a starburst galaxy with high star formation rate (SFR) of 13 solar masses per year.
Morphology
The edges of the galaxy are warped, which is not commonly seen in other ring galaxies. The galaxy has a double nucleus with lots of A-type stars located there. This peculiar morphology is from a galaxy collision making UGC 7069 a massive collision ring galaxy.
There are several candidate galaxies that may have collided with UGC 7069 to form its unusual structure. They include:
Discovery
It was detected by the Kitt Peak National Observatory (KPNO) International Spectroscopic survey as an emission-line galaxy.
References
- 1 2 "NED Results for UGC 7069". Retrieved 2025-07-30.
- 1 2 3 Ghosh, Kajal K.; Mapelli, Michela (2008-05-01). "UGC 7069: the largest ring galaxy". Monthly Notices of the Royal Astronomical Society: Letters. 386 (1): L38–L42. arXiv:0802.1270. doi:10.1111/j.1745-3933.2008.00456.x. ISSN 1745-3925.
- ↑ "CzSkY". www.czsky.eu. Retrieved 2025-07-12.
- ↑ Ford, Dominic. "UGC 7069 (Galaxy)". In-The-Sky.org. Retrieved 2025-07-12.