| Abell 400 | |
|---|---|
 Abell 400 with thelegacy surveys | |
| Observation data (EpochJ2000) | |
| Constellation(s) | Cetus |
| Right ascension | 02h 57m 38.6s[1] |
| Declination | +06° 02′ 00″[1] |
| Richness class | 1[2] |
| Bautz–Morgan classification | II-III[2] |
| Redshift | 0.0244 (7 315 km/s)[1] |
| Distance | 100 Mpc (326 Mly)h−1 0.705 |
| X-rayflux | (16.2 ± 20.5%)×10−12erg s−1 cm−2 (0.1–2.4keV)[1] |
Abell 400 is agalaxy cluster which contains thegalaxyNGC 1128 with twosupermassive black holes (3C 75) spiraling towards merger.
These two supermassive black holes are contained in NGC 1128. The galaxy, microwave radio jets, multi-million degree X-ray producing gas and resultant radio source is known as 3C 75. X-ray source 2A 0252+060 (1H 0253+058, XRS 02522+060) may be some additional or other portion of Abell 400.[3]
The black holes are an estimated 25,000 light years apart, and thus will take millions of years to collide. Should the two supermassive black holes merge, they will form a single super-supermassive black hole.[4]
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