H15A hosts a (2.16+0.23-0.18) x 10^10 solar mass black hole, making it one of the two most massive SMBHs known in the local universe, based on triaxial orbit modeling of Keck KCWI stellar kinematics.
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A 22-Billion Solar Mass Black Hole in Holmberg 15A with Keck KCWI Spectroscopy and Triaxial Orbit Modeling
H15A hosts a (2.16+0.23-0.18) x 10^10 solar mass black hole, making it one of the two most massive SMBHs known in the local universe, based on triaxial orbit modeling of Keck KCWI stellar kinematics.