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We report on results from new high-sensitivity, high-resolution 86GHz (3.5millimeter) observations of the jet base in the nearby radio galaxy M87,obtained by the Very Long Baseline Array in conjunction with the Green BankTelescope. The resulting image has a dynamic range exceeding 1500 to 1, thehighest ever achieved for this jet at this frequency, resolving and imaging adetailed jet formation/collimation structure down to ~10 Schwarzschild radii(Rs). The obtained 86GHz image clearly confirms some important jet featuresknown at lower frequencies, i.e., a wide-opening angle jet base, alimb-brightened intensity profile, a parabola-shape collimation profile and acounter jet. The limb-brightened structure is already well developed at <0.2mas (< 28Rs, projected) from the core, where the corresponding apparentopening angle becomes as wide as ~100 degrees. The subsequent jet collimationnear the black hole evolves in a complicated manner; there is a "constricted"structure at tens Rs from the core, where the jet cross section is locallyshrinking. We suggest that an external pressure support from the inner part ofradiatively-inefficient accretion flow may be dynamically important inshaping/confining the footprint of the magnetized jet. We also present thefirst VLBI 86GHz polarimetric experiment for this source, where a highlypolarized (~20%) feature is detected near the jet base, indicating the presenceof a well-ordered magnetic field. As a by-product, we additionally report a43/86 GHz polarimetric result for our calibrator 3C 273 suggesting an extremerotation measure near the core.

High-Sensitivity 86GHz (3.5mm) VLBI Observations of M87: Deep Imaging of the Jet Base at a 10 Schwarzschild-Radius Resolution