A Giant Black Hole's Wake in a Spiral Galaxy ⚡ экспресс
In spiral galaxy NGC 3627, a kiloparsec-scale molecular contrail has been discovered—a narrow structure 8 kpc long, 200 pc wide, with an extreme aspect ratio of ~40. It is seen both in mid-infrared dust emission (PHANGS–JWST) and in the CO(2–1) line (PHANGS–ALMA). The contrail’s size greatly surpasses all known galactic analogs in the Milky Way; the gas exhibits supersonic turbulence (~10 km/s). The morphology and dynamics match a model of gravitational focusing by a passing compact object with a mass of around 10⁶ M⊙ (likely a massive black hole or a dwarf galaxy nucleus) crossing the disk at >300 km/s. The characteristic crossing time, estimated from the width and velocity dispersion, is only ~20 million years, indicating a recent interaction. Such galactic contrails open the door to probing massive dark objects that interact with the interstellar medium in and around galaxy disks.
In the galaxy NGC 3627, a trail of cosmic dust and gas has been found, resembling the wake of a speedboat. The role of the speedboat was played by a massive black hole or the core of a dwarf galaxy that tore through the disk at over 300 km/s. The wake stretches for 26,000 light-years but is just 650 light-years wide — like a pencil line drawn across a football field. The gas inside moves chaotically at tens of kilometers per second, hinting at a recent event: only about 20 million years ago.
The object that left this trail likely had a mass millions of times that of the Sun — an invisible giant that gave itself away by rippling the galactic disk. Such wakes can be spotted by telescopes like James Webb and ALMA, opening a new way to hunt for hidden massive bodies.
🎯 It takes light 26,000 years to travel from one end of the wake to the other — that's longer than the distance from Earth to the center of our Galaxy.