Birth Echo: How Astronomers Found Evidence of a Black Hole ⚡ экспресс
An X-ray shell has been detected north of the Galactic microquasar SS 433, which contains a stellar-mass black hole. The shell coincides spatially with radio emission (including polarized) and a neutral hydrogen cloud. Its spectrum is well matched by a model of weakly ionized plasma at ~1 keV, implying that the shell is a supernova remnant that exploded 20–30 kyr ago. Alternative scenarios — heating by jets or sweeping by a disk wind — are ruled out. This provides direct observational evidence that some black holes are born in the explosive collapse of stars. A lower limit on the compact object's mass points to a progenitor heavier than 25 M⊙. The presence of such a young remnant illuminates supercritical accretion in young microquasars and their gamma-ray emission; fallback material may fuel the accretor, while the remnant’s shock front likely boosts cosmic-ray re-acceleration.
The life of massive stars ends in a colossal explosion — a supernova. Afterward, a black hole may remain, but direct evidence of this scenario has long been missing. Now astronomers have spotted a shell of hot gas around the black hole SS 433 — like a ring of steam over a gigantic cup of coffee. Spectral analysis shows this 'steam' is only 20,000–30,000 years old, a cosmic blink. The gas composition and a nearby cloud of cold hydrogen confirm: it was ejected by the explosion, not by the black hole's jets. A surprise: the black hole is now devouring material from its own cooling shell — it's feeding on the 'ashes' of its birth. The progenitor was over 25 times the mass of the Sun. Such discoveries help clarify which stars turn into black holes and explain the origin of high-energy particles bombarding Earth.
🎯 The light from the explosion traveled 18,000 years to reach us: it could have been seen by Stone Age people when mammoths still roamed the Earth.