Constraining the Mass of a Hypothetical Secondary Black Hole in M87 with the NANOGrav 15 yr Data Set
Motoki Kino et al 2025 ApJ 986 49 If caused by a second black hole, the 11-year and 0.9-year periodic behaviors seen in Messier 87’s jet would be due to a black hole with a mass between a few million…
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