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Highest resolution view of the heart of a blazar achieved

An international team, including several researchers from the Max Planck Institute for Radio Astronomy in Bonn, has mapped the active galaxy OJ 287 with an angular resolution of 12 microarcseconds in the radio range. This is currently the highest resolution that can be achieved with astronomical observations. This was made possible by the technique of interferometry with very long baselines. The signals from twelve radio telescopes—one on board the Russian Spektr-R satellite—were combined. The resulting virtual telescope had a diameter of 193,000 kilometers.
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