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First Radio Image Shows Two Black Holes Orbiting in Quasar OJ287

Space–Earth radio baselines from the RadioAstron mission provided the resolving power to distinguish twin jets in OJ287.

Overview

  • A peer-reviewed Astrophysical Journal study reports a radio image identifying two distinct jets that the team interprets as two orbiting supermassive black holes in OJ287.
  • The image relies on space–Earth very long baseline interferometry that included the RadioAstron satellite, delivering roughly 100,000 times the resolution of optical observations.
  • Researchers tie the features to OJ287’s longstanding 12-year brightness cycle and estimate the black holes at about 18 billion and 150 million solar masses.
  • The team identifies a twisted, “wagging tail” jet from the smaller companion and predicts observable changes in its direction as the orbit progresses in coming years.
  • NASA’s TESS had previously detected light from both components without resolving them, and current Earth-only arrays lack the RadioAstron-era baselines used for this image.