A paradigm shift in our understanding of a well-known astrophysical phenomenon
Matter outflows in the form of jets are observed in astronomical systems at fast, medium and slow speeds. The fastest jets are highly relativistic, namely travel very close to the speed of light. The origin, as well as many properties of the jets, is uncertain. One of the puzzles, that jet velocities seem to have a bi-modal distribution - some very fast and others slow, with a gap in velocities