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Aims. Adaptive optics images are used to test the hypothesis that theexplosive BN/KL outflow from the Orion OMC1 cloud core was powered by thedynamical decay of a non-hierarchical system of massive stars. Methods.Narrow-band H2, [Fe II], and broad-band Ks obtained with the Gemini Southmulti-conjugate adaptive optics (AO) system GeMS and near-infrared imager GSAOIare presented. The images reach resolutions of 0.08 to 0.10", close to the0.07" diffraction limit of the 8-meter telescope at 2.12 microns. Comparisonwith previous AO-assisted observations of sub-fields and other ground-basedobservations enable measurements of proper motions and the investigation ofmorphological changes in H2 and [Fe II] features with unprecedented precision.The images are compared with numerical simulations of compact, high-densityclumps moving ~1000 times their own diameter through a lower density medium atMach 1000. Results. Several sub-arcsecond H2 features and many [Fe II]'fingertips' on the projected outskirts of the flow show proper motions of ~300km/s. High-velocity, sub-arcsecond H2 knots ('bullets') are seen as far as 140"from their suspected ejection site. If these knots propagated through the denseOrion A cloud, their survival sets a lower bound on their densities of order10^7 cm^-3, consistent with an origin within a few au of a massive star andaccelerated by a final multi-body dynamic encounter that ejected the BN objectand radio source I from OMC1 about 500 years ago. Conclusions. Over 120high-velocity bow-shocks propagating in nearly all directions from the OMC1cloud core provide evidence for an explosive origin for the BN/KL outflowtriggered by the dynamic decay of a non-hierarchical system of massive stars.Such events may be linked to the origin of runaway, massive stars.

The Orion Fingers: Near-IR Adaptive Optics Imaging of an Explosive Protostellar Outflow