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Flares in radio-loud AGN are thought to be associated with the injection offresh plasma into the compact jet base. Such flares are usually strongest andappear earlier at shorter radio wavelengths. Hence, VLBI at mm-wavelengths isbest suited to study the earliest structural changes of compact jets associatedwith emission flares. We study the morphological changes of the parsec-scalejet in the nearby (z=0.049) gamma-ray bright radio galaxy 3C111 following aflare that developed into a major radio outburst in 2007. We analyse threesuccessive observations of 3C111 at 86 GHz with the Global mm-VLBI Array (GMVA)between 2007 and 2008 which yield a very high angular resolution of ~45muas. Inaddition, we make use of single-dish radio flux density measurements from theF-GAMMA and POLAMI programmes, archival single-dish and VLBI data. We resolvethe flare into multiple plasma components with a distinct morphology resemblinga bend in an otherwise remarkably straight jet. The flare-associated featuresmove with apparent velocities of ~4.0c to ~4.5c and can be traced also at lowerfrequencies in later epochs. Near the base of the jet, we find two brightfeatures with high brightness temperatures up to ~10^11K, which we associatewith the core and a stationary feature in the jet. The flare led to multiplenew jet components indicative of a dynamic modulation during the ejection. Weinterpret the bend-like feature as a direct result of the outburst which makesit possible to trace the transverse structure of the jet. In this scenario, thecomponents follow different paths in the jet stream consistent withexpectations for a spine-sheath structure, which is not seen duringintermediate levels of activity. The possibility of coordinated multiwavelengthobservations during a future bright radio flare in 3C111 makes this source anexcellent target for probing the radio-gamma-ray connection.

Sub-milliarcsecond imaging of a bright flare and ejection event in the extragalactic jet 3C 111