Astronomy:PKS 2131-021
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PKS 2131-021 is a blazar, a type of active galactic nucleus whose relativistic jet points in the direction toward the Earth. Its redshift is 1.285. Observations of its radio emission spanning a 45-year duration show epochs of periodic brightness variations. These nearly sinusoidal brightness changes have been interpreted as evidence of orbital motion of a binary black hole.[1] The orbital separation of the two black holes is inferred to be 200 to 2000 AU.[2][3] The periodic variability in the light curve indicates that the pair orbit each other about every two years, at a distance so close that they will merge in about 10,000 years (as viewed from the Earth).[4]
See also
References
- ↑ O'Neill, S. (2022). "The Unanticipated Phenomenology of the Blazar PKS 2131–021: A Unique Supermassive Black Hole Binary Candidate". The Astrophysical Journal Letters 926 (2): 2. doi:10.3847/2041-8213/ac504b. Bibcode: 2022ApJ...926L..35O.
- ↑ DiCenza, Shawn (2022-03-24). "Astronomers Discover two Supermassive Black Holes Orbiting Each Other, Doomed to Collide in the Future." (in en-US). https://www.universetoday.com/155117/astronomers-discover-two-supermassive-black-holes-orbiting-each-other-doomed-to-collide-in-the-future/.
- ↑ "These Two Black Hole Behemoths Will Merge in 10,000 Years" (in en-US). 2022-02-28. https://skyandtelescope.org/astronomy-news/supermassive-black-holes-tight-dance/.
- ↑ "Colossal Black Holes Locked in Dance at Heart of Galaxy" (in en). 2022-02-23. https://www.caltech.edu/about/news/colossal-black-holes-locked-in-dance-at-heart-of-galaxy.
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