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The silhouette cast by the horizon of the supermassive black hole in M87 cannow be resolved with the emerging millimeter very-long baseline interferometry(VLBI) capability. Despite being ~2000 times farther away than SgrA* (thesupermassive black hole at the center of the Milky-Way and the primary targetfor horizon-scale imaging), M87's much larger black hole mass results in ahorizon angular scale roughly half that of SgrA*'s, providing another practicaltarget for direct imaging. However, unlike SgrA*, M87 exhibits a powerful radiojet, providing an opportunity to study jet formation physics on horizon scales.We employ a simple, qualitatively correct force-free jet model to explore theexpected high-resolution images of M87 at wavelengths of 1.3mm and 0.87mm(230GHz and 345GHz), for a variety of jet parameters. We show that future VLBIdata will be able to constrain the size of the jet footprint, the jetcollimation rate, and the black hole spin. Polarization will further probe thestructure of the jet's magnetic field and its effect on the emitting gas.Horizon-scale imaging of M87 and SgrA* will enable for the first time theempirical exploration of the relationship between the mass and spin of a blackhole and the characteristics of the gas inflow/outflow around it.

Imaging the Black Hole Silhouette of M87: Implications for Jet Formation and Black Hole Spin