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This study successfully applies stellar dynamics to a distant, inactive black hole at redshift 2 by leveraging gravitational lensing to magnify faint signals from the James Webb Space Telescope. The resulting mass measurement provides a critical data point for testing and refining scaling relations between black holes and their host galaxies over cosmic time. This work highlights the necessity of precise kinematic modeling to resolve how black hole-galaxy co-evolution has changed since the universe was ten billion years old.

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Galaxy Lens Shares Black Hole Mass at Redshift 2

Quantum ZeitgeistJune 6, 20265 min read

Researchers measured the mass of an inactive black hole at a high redshift of 2, using stellar dynamics—a rare feat at this distance.

A team of thirty-four authors has measured the mass of an inactive black hole existing when the universe was ten billion years old, at a redshift of 2. Researchers led by Andrew B. Newman utilized stellar kinematics, typically reserved for studying nearby objects, to determine the black hole’s mass. This measurement was made possible by exploiting a gravitational lens that magnified the light from the galaxy MRG-M0138, allowing for detailed modeling of the stars within the black hole’s sphere of influence. The black hole’s mass is determined to be 6.0 − 1.7 + 2.1 × 109 solar masses, a…

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