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Decade-Long Study Reveals Secrets of a Double Black Hole Blazar

An international team observed the blazar OJ 287 for a decade, recording its optical brightness and colour.

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Key Points

5 points

Decade‑long optical campaign captured OJ 287’s brightness and spectrum.

Binary supermassive black holes with a 12‑year period.

Relativistic jets produce variable emissions from radio to gamma rays.

Collaboration of 106 scientists, 48 institutions, 18 nations, using ~24 telescopes.

Results advance knowledge of jet physics and multimessenger signals.

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OJ 287 hosts a binary system of two supermassive black holes with a twelve‑year orbital period.

The blazar emits relativistic jets directed toward Earth, causing rapid variations across the electromagnetic spectrum.

More than one hundred scientists from 48 institutions across 18 nations contributed data from dozens of ground‑based and space telescopes.

Findings improve understanding of black‑hole dynamics, jet emission mechanisms, and multimessenger astronomy.

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8 words

blazar

an active galactic nucleus with a jet aimed toward Earth, producing variable emissions

plasma

ionized gas consisting of free electrons and ions, common in space jets

electromagnetic spectrum

range of all electromagnetic radiation, from low‑frequency radio to high‑frequency gamma rays

binary black hole system

two supermassive black holes gravitationally bound and orbiting each other

relativistic jets

narrow streams of particles ejected at speeds close to light speed

multimessenger astronomy

study that combines different signals like light, gravitational waves, neutrinos, and cosmic rays

polarisation

the direction in which light waves vibrate

light‑year

distance light travels in one year, about 9.5 trillion kilometres

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