Fig. 3: Curved jet in the inner region.
From: Co-precession of a curved jet and compact accretion disk in M87
Left, the red points with 1σ error bars are the projected jet width profile data from ref. 15 based on 86-GHz GMV + ALMA + GLT observations in 2018. The measurement uncertainties account for fitting errors and resolution limits, as described in their Supplementary Information Section 8. The dashed curve shows the projected jet width of the collimated jet with a = 0.9 viewed from a fixed viewing angle ϕ = 17° (refs. 15,32). The solid curve indicates the corresponding projected jet width of a curved jet with the best-fitting parameters. The light curves are predictions with randomly selected parameter samples obtained from a MCMC analysis and represent the uncertainty of the fitting. The precession angle at milliarcsecond scales (1.25° ± 0.18°)16 was incorporated into the MCMC analysis. Right, 3D configuration of the jet structure and the corresponding profile projected onto the sky plane. The z axis is along the LOS. Positive z represents the direction pointing towards the Earth, and the x–y plane indicates the sky plane. The green cone indicates the jet, and its central green solid line represents the jet axis. The magenta arrow denotes the BH spin, which is aligned with the black dashed line representing the precession axis.
