The black hole's spin axis is assumed to align vertically. The jet’s direction is almost perpendicular to the disk. The misalignment between the black hole spin axis and the disk rotation axis triggers the precession of the disk and jet. (Photo provided to China News Service)
Observation data has found that the super massive black hole jet at the center of one of the largest galaxies in the local universe, Messier 87, exhibits periodic oscillations.
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. (Photo provided to China News Service)
Photo shows the concept map of the East Asia Very Long Baseline Interferometry (EA VLBI Network, EAVN) Network. (Photo provided to China News Service)
Photo shows the East Asia to Italy Nearly Global (EATING) network. (Photo provided to China News Service)