Issaoun, Wielgus, and colleagues discovered a radial polarization pattern (first figure, right) near the black hole’s core. The data encompassed measurements at four radio frequencies and linear polarization information (see Physics Today, June 2021, page 16). That’s not enough to resolve the event horizon, as the EHT famously did for its primary targets, but sufficient to study the blazar’s inner anatomy and jet morphology. By combining the EHT observations with those also made in April 2017 by two other telescope arrays, the researchers attained images of the black hole (like the one at left in the first figure) with a resolution of 0.1 parsec. The views of J1924–2914 and the other targets of the EHT project are enhanced through very long baseline interferometry, in which multiple telescopes are synchronized to achieve a resolution equivalent to that of a single telescope with a diameter the size of the entire array (see the Quick Study by Dimitrios Psaltis and Feryal Özel, Physics Today, April 2018, page 70). A new analysis of the measurements by Sara Issaoun (Center for Astrophysics|Harvard & Smithsonian), Maciek Wielgus (Max Planck Institute for Radio Astronomy), and their team reveals what they suspect is an intriguing twist in the black hole’s relativistic jet.
As a bonus, the maneuver yielded valuable data on J1924–2914. Without the calibration, researchers wouldn’t have been able to obtain the Sagittarius A* image that was released earlier this year. Located about 3.7 billion light-years away, J1924–2914 is a blazar: an active black hole that ejects a jet of particles and radiation toward Earth. In April 2017, as the Event Horizon Telescope (EHT) collaboration prepared to point the world’s most powerful radio telescopes at the Milky Way’s supermassive black hole, Sagittarius A*, the team calibrated its instruments by observing another cosmic target. The database of the learning hub includes a variety of resources, from learning materials to funding opportunities and analysis of trends, tailored to support understanding of technology and a qualified future European workforce.Credit: Adapted from S. Training and learning opportunities on the learning hub come in different formats: from face-to-face workshops on high-performance computing in Europe, to online trainings for businesses in Big Data management, webinars, workshops and many others. It also offers a learning hub for its network of members, providing a secure environment in which advanced digital skills and knowledge of emerging technologies can be acquired.
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