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Understanding the launching, acceleration, and collimation of jets powered byactive galactic nuclei remains an outstanding problem in relativisticastrophysics. This is partly because observational tests of jet formationmodels suffer from the limited angular resolution of ground-based very longbaseline interferometry that has thus far been able to probe the transverse jetstructure in the acceleration and collimation zone of only two sources. Here wereport radio interferometric observations of 3C 84 (NGC 1275), the centralgalaxy of the Perseus cluster, made with an array including the orbiting radiotelescope of the RadioAstron mission. The obtained image transversely resolvesthe edge-brightened jet in 3C 84 only 30 microarcseconds from the core, whichis ten times closer to the central engine than what has been possible inprevious ground-based observations, and it allows us to measure the jetcollimation profile from ~ 100 to ~10000 gravitational radii from the blackhole. The previously found, almost cylindrical jet profile on scales largerthan a few thousand r_g is now seen to continue at least down to a few hundredr_g from the black hole and we find a broad jet with a transverse radius largerthan about 250 r_g at only 350 r_g from the core. If the bright outer jet layeris launched by the black hole ergosphere, it has to rapidly expand laterally onscales smaller than 100 r_g. If this is not the case, then this jet sheath islikely launched from the accretion disk.

A wide and collimated radio jet in 3C 84 on the scale of a few hundred gravitational radii