|Observation data (J2000 epoch)|
|Right ascension||04h 05m 49.2s|
|Declination||+38° 03′ 32″|
|Redshift||16,500 ± 300 km/s|
|Distance||750 Mly (230 Mpc) |
|Apparent magnitude (V)||17.2|
|GLXY J0405+380 , B2 0402+37 , 2MASX J04054928+3803320 , RX J0405.8+3803|
4C +37.11 or Galaxy 0402+379 is a radio galaxy and elliptical galaxy featuring binary supermassive black holes with the least separation of any directly observed binaries, as of 2006. The separation between the two is 24 light-years or 7.3 parsecs, with an orbital period of 30,000 years. The two supermassive black holes, about 750 million light years from earth, have a combined mass of about 15 billion M☉.
The previous directly observed least separation of supermassive binary black holes was 2,400 light-years. However, quasar OJ 287 is inferred to have a binary supermassive black hole pair with an orbital period of 12 years, and thus be much closer together, but they have not been directly observed.
- "NASA/IPAC Extragalactic Database". Results for 0402+379. Retrieved 26 November 2006.
- "Scientists Find Closest Pair of Supermassive Black Holes". PhysOrg.com. Retrieved 15 March 2008.
- Klesman, Alison (29 June 2017). "Astronomers spot a pair of orbiting supermassive black holes". Astronomy Magazine.
- VLBA Reveals Closest Pair of Supermassive Black Holes (UNM Today) 2 May 2006
- A Compact Supermassive Black-Hole Binary System (Los Alamos National Laborator - LANL)
- Black Hole Pair Sets Proximity Record (SPACE.com) 1 May 2006 02:04 pm ET
- Two black holes come oh-so-close (MSNBC) 5:23 p.m. ET 1 May 2006
- Colossal black holes seen in closest clinch yet (New Scientist) 16:02 21 April 2006
- A Supermassive Black Hole Pairing (Centauri Dreams)
- Scientists Find Closest Pair of Supermassive Black Holes (PhysOrg.com) 1 May 2006
- VLBA Reveals Closest Pair of Supermassive Black Holes (SpaceRef.com) Monday, 1 May 2006
- Closest-spaced giant black hole pair found (SpaceFlight Now) 1 May 2006
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