![]() ![]() We find that the source structure of Centaurus A resembles the jet in Messier 87 on ~500 r g scales remarkably well. We reveal a highly collimated, asymmetrically edge-brightened jet as well as the fainter counterjet. Compared with previous observations 3, we image the jet of Centaurus A at a tenfold higher frequency and sixteen times sharper resolution and thereby probe sub-lightday structures. Here we show the millimetre VLBI image of the source, which we obtained with the Event Horizon Telescope at 228 GHz. A large southern declination of −43° has, however, prevented VLBI imaging of Centaurus A below a wavelength of 1 cm thus far. It bridges the gap in mass and accretion rate between the supermassive black holes (SMBHs) in Messier 87 and our Galactic Centre. Centaurus A is the closest radio-loud source to Earth 2. Very-long-baseline interferometry (VLBI) observations of active galactic nuclei at millimetre wavelengths have the power to reveal the launching and initial collimation region of extragalactic radio jets, down to 10–100 gravitational radii ( r g ≡ G M/ c 2) scales in nearby sources 1. Nature Astronomy volume 5, pages 1017–1028 ( 2021) Cite this article The Event Horizon Telescope Collaboration.Event Horizon Telescope observations of the jet launching and collimation in Centaurus A ![]()
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