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Prof. Heino Falcke, University Nijmegen: Imaging Black Holes from ground and space
Physics Colloquium und Vortrag in der Marienkirche mit Diskussion
In 2019, the Event Horizon Telescope (EHT) captured the first-ever image of a black hole, observing its dark shadow in the radio galaxy M87. In 2022, the black hole at the center of our Milky Way was imaged, validating our predictions made more than two decades ago. This confirmed the presence of supermassive black holes at the centers of galaxies and provides strong evidence for the presence of an event horizon. The next step is to measure the properties of these black holes, test theories of gravity, and to understand the physics near the event horizon: Are these black holes spinning? What is the structure of accretion flows and jets? Is rotational energy extracted from the black hole to launch plasma jets? Where and how are particles accelerated that produce the radiations we see? To answer these question we will be engaging in campaigns to produce “color movies” of black holes, i.e. make dynamic images of black holes and observe them at multiple frequencies. To do this we are developing new imaging algorithms, new operational models, and new telescopes. The EHT is expanding further. Funded by an ERC Synergy grant, “BlackHolistic”, we are now also building the 14m Africa mm-wave telescope (AMT) in Namibia, equipped with multiband receivers for Very Long Baseline Interferometry (VLBI) and transients research. In the future space interferometers will improve the results by another order of magnitude and promise even deeper insights into the nature of black holes.
Veranstaltung in der Marienkirche
Nach dem Kolloquium spricht der Astrophysiker und Buchautor Professor Falcke um 19 Uhr in der Bielefelder Marienkirche in Jöllenbeck (Eickumer Straße 19 • 33739 Bielefeld). Das Thema lautet dann: „Vom Urknall zum Sinn – Heino Falcke über Himmel, Erde und den Glauben dazwischen“.
Raum: H5