The M87 galaxy's black hole exhibits an oscillating jet, confirming its spin, as deduced from a two-decade study aligning with Einstein's General Theory of Relativity predictions. The nearby radio galaxy M87, located 55 million light-years from the Earth and harboring a black hole 6.5 billion tim
—the most disruptive celestial objects in our universe—can accrete tremendous amounts of material due to the extraordinary gravitational force and power ofoutflows, known as jets, that approach the speed of light and extend thousands of light-years away.
Top panel: M87 jet structure at 43 GHz based on bi-yearly stacking data observed from 2013–2018. The white arrows indicate the jet position angle in each subplot. Bottom panel: Best fitted results based on the yearly stacked image from 2000–2022. The green and blue points were obtained from observations at 22 GHz and 43 GHz, respectively. The red line represents the best fit according to the precession model. Credit: Yuzhu Cui et al.
“We are thrilled by this significant finding,” said Yuzhu Cui, a postdoctoral researcher at Zhejiang Lab, a research institution in Hangzhou, and lead and corresponding author of the paper. “Since the misalignment between the black hole and the disk is relatively small and the precession period is around 11 years, accumulating high-resolution data tracing M87’s structure over two decades and thorough analysis are essential to obtain this achievement.
Radio telescopes in China also made contribution to this project, including China’s Tianma 65-meter radio telescope with its huge dish and high sensitivity at millimeter wavelengths. In addition, Xinjiang 26-meter radio telescope enhances the angular resolution of EAVN observations. The good quality data with both high sensitivity and high angular resolution are essential to obtain this achievement.
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