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We present analysis of comprehensive radio observations of the black holeV404 Cyg during its 2015 outburst. These data represent the best ever coverageof jet production and particle acceleration from any black hole. We report forthe first time a clear and near-linear flux-rms correlation in the radio fluxdensities. Investigation of individual flares reveals in nearly all cases thepeak corresponds to the transition from optically thick to thin to synchrotronemission, but an extended phase of particle acceleration is required incontrast to simple impulsive injection models. The largest radio flare ispreceded by a phase of optical oscillations and followed one day later by asmaller but optically thin flare, likely due to ejecta interacting with theinterstellar medium. Comparing the radio emission to contemporaneous X-ray andoptical data, we find that the X-ray and radio measurements are correlated onall timescales from seconds to one day. Correlation with the optical fluxdensities is weak at short timescales, but becomes significant on timescalesgreater than a few hours. We evaluate the physical conditions (size, magneticfield and internal energy) associated with 86 individual radio flares, which inturn allows us to place a lower limit on the kinetic feedback over the 15 daysof intense activity. If this energy was deposited locally to the source, asimplied by the failure to detect jets on angular scales larger thanmilliarcsec, then we predict that a nova-like shell could have been formed.

Comprehensive coverage of particle acceleration and kinetic feedback from the stellar mass black hole V404 Cygni