| NGC 1128 | |
|---|---|
Binary black hole system 3C 75 contained in the dumbbell shaped galaxy NGC 1128 |
|
| Observation data (J2000 epoch) | |
| Right ascension | 2h 57m 41.6s[1] |
| Declination | +6° 01′ 29″[1] |
| Redshift | 6940 ± 20 km/s[1] |
| Distance | 300 Mly[2] |
| Type | E0[1] |
| Apparent dimensions (V) | 0'.9 × 0'.4[1] |
| Apparent magnitude (V) | 13.8[1] |
| Notable features | Dumbbell-shaped galaxy |
| Other designations | |
| PGC 11188[1] | |
| See also: Galaxy, List of galaxies | |
NGC 1128 is a "dumbbell galaxy" in the Abell 400 galaxy cluster. It is the center of the 3C75 radio source and contains two orbiting supermassive black holes that may be merging. Computer simulations indicate that these two black holes will gradually spiral in toward each other until they merge. Lewis Swift is credited with the discovery of NGC 1128 in 1886. However, there is a possible 5 min error in Swift's records that casts some doubt on his discovery.
