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)[1] |
| Absolute magnitude (B) | 15.70 |
| Characteristics | |
| Type | Ring galaxy |
| Size | 388,885 ly (119.29 kpc) (estimated)[1] |
| 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.[2][3]
Morphology
The edges of the galaxy 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.[2][4]
There are several candidate galaxies that may have collided with UGC 7069 to form its unusual structure. They include:
- SDSS J120433.94+430611.1
- SDSS J120432.24+430307.2
- SDSS J120515.56+431008.4
- SDSS J120517.29+430534.8
- SDSS J120523.31+431107.5
Discovery
It was detected by the Kitt Peak National Observatory (KPNO) International Spectroscopic survey as an emission-line galaxy.[2]
Reference
- ^ a b "NED Results for UGC 7069". Retrieved 2025-07-30.
- ^ a b c 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.