目前已發現一些超重雙黑洞候選系統[2],它們在天文物理學中被視為具高度重要性,因為它們是目前宇宙中已知的最強重力波源。隨著公轉的黑洞向外散播出重力波,它們的軌道逐漸衰變,其公轉週期亦隨之變短。這個階段被稱作雙黑洞旋近(binary black hole inspiral)。當二個黑洞足夠靠近,便會併合成單一黑洞。併合後,這個單一的黑洞進入了铃宕(ring-down)階段,它的任何形變隨著更多重力波的產生而逐漸消散[3]。
Liu, Fukun; Komossa, Stefanie; Schartel, Norbert. UNIQUE PAIR OF HIDDEN BLACK HOLES DISCOVERED BY XMM-NEWTON. A milli-parsec supermassive black hole binary candidate in the galaxy SDSS J120136.02+300305.5. 2014-04-22 [2014-12-23]. (原始内容存档于2018-04-04).
Krishnendu, N. V.; Yelikar, A. B. Testing the Kerr nature of intermediate-mass and supermassive black hole binaries using spin-induced multipole moment measurements. 2019. Bibcode:2019arXiv190412712K. arXiv:1904.12712.
Merritt, David; Milosavljevic, Milos. Massive Black Hole Binary Evolution. Living Reviews in Relativity (Max-Planck-Institut für Gravitationsphysik). 2005, 8. (原始内容存档于2012-03-30).
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