Astronomers Observe Powerful Supernova-Driven Wind in Early Universe Galaxy

A team led by Dr. Rebecca Davies of Swinburne University of Technology has published observations in the Monthly Notices of the Royal Astronomical Society showing that CRISTAL-02, a galaxy system at redshift 5.3, is being destroyed by its own star-forming activity. Using JWST and ALMA, the researchers detected a vast plume of cold gas extending roughly 7 kiloparsecs from the galaxy, moving outward at estimated speeds of 640 to over 1,000 kilometers per second — potentially exceeding the galaxy's escape velocity of about 600 km/s. CRISTAL-02 is itself a merger of multiple galaxies, and the collision appears to have funneled gas toward galactic centers, triggering star formation at 260 solar masses per year, roughly twice to three times the rate of comparable galaxies. The resulting supernova explosions drive winds expelling approximately 520 solar masses of gas per year, a mass-loading factor of about 2. No X-ray, radio, or spectral evidence for an active galactic nucleus was found, pointing to stellar feedback rather than a supermassive black hole as the primary driver. The researchers also compared CRISTAL-02 against 99 starburst-driven outflows spanning 12 billion years of cosmic history, finding that the efficiency of stellar feedback has remained broadly constant, suggesting this mechanism could have been widespread in the early universe where nearly half of massive galaxies were undergoing mergers.