Scientists Pinpoint Timing of Black Hole Jets

Scientists have clarified the timing of the dramatic “burp” that black holes emit after consuming stars, revealing that the powerful jets are launched in two distinct phases during the feeding cycle. By combining high‑resolution observations with detailed simulations, the research team showed that the first phase occurs immediately after a star is torn apart, producing a rapid, narrow jet that pierces the surrounding gas. A second, more prolonged phase follows, during which a wider, slower outflow carries material across interstellar distances.

The findings illuminate how black holes regulate their growth and influence their host galaxies. The dual‑phase jet mechanism explains why some active galactic nuclei display both bright, compact cores and extended radio lobes, and it provides a framework for interpreting the energy input that shapes galactic evolution. With this new understanding, astronomers can better model the complex interplay between accretion, jet production, and the cosmic environment surrounding black holes.