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THE INNERMOST COLLIMATION STRUCTURE OF THE M87 JET DOWN TO ∼10 SCHWARZSCHILD RADII
We investigated the detailed inner jet structure of M87 using the Very Long Baseline Array data at 2, 5, 8.4, 15, 23.8, 43, and 86 GHz, especially focusing on the multi-frequency properties of the radio core at the jet base. First, we measured a size of the core region transverse to the jet axis, defined as W_ c, at each frequency ν, and found a relation between W_ c and ν as W_ c(ν) ∝ν^-0.71±0.05. Then, by combining W_ c(ν) and the frequency dependence of the core position r_ c(ν), which wasdoi:10.1088/0004-637x/775/1/70 fatcat:fmkvhbl3zne2dkjmque55kw7xe