Weighing the Invisible: A Black Hole in the Early Universe ⚡ экспресс
The first dynamical mass measurement of a supermassive black hole beyond redshift 2 is presented, using high-resolution observations of the [C II] 158 μm emission line in an obscured quasar at z=4.6. The gas velocity dispersion increases toward the nucleus, requiring a central mass of (6.3±0.14)×10^9 solar masses. The sphere of influence is resolved, enabling a direct mass estimate. This result demonstrates that dust-obscured quasars preserve [C II] emission in inner regions, making them prime targets for expanding dynamical SMBH mass measurements in the early Universe. Such measurements are crucial for understanding the formation and evolution of the first massive black holes.
To weigh an invisible black hole 13 billion years old, astronomers harnessed the power of a whirlpool. The logic is straightforward: the faster gas swirls around the galaxy's center, the more massive the gravitational 'drain.' Capturing this motion was aided by carbon—its ions emit infrared light that pierces even thick dust. Using breaking light into colors, scientists measured the sharp acceleration of clouds toward the center. The calculation revealed a giant of 6.3 billion Suns lurking there.
Previously, the mass of early black holes was estimated only indirectly. Now, the first 'dynamical weighing' was achieved—directly from the motion of matter. Dusty galaxies, once considered inconvenient for observations, actually preserved the signal like a time capsule. An unexpected twist: it was the dust itself, normally a hindrance to astronomers, that guarded the carbon glow from destruction, turning the galaxy into a perfect archive of the ancient universe. Now, such objects are prime targets for hunting the first cosmic heavyweights.
🎯 The light from carbon ions used in the study was born just 1.4 billion years after the Big Bang and traveled 12.8 billion light-years to reach our telescopes.