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The process of massive star formation is tightly connected with theappearance of molecular outflows, which interact with surrounding interstellarmedium and can be used as a proxy to study the accretion process of materialonto forming massive stars. We aim to characterize the morphology andkinematics, as well as the driving source, of the molecular outflow from themassive young stellar object G192.16-3.82, which is associated with the giantHerbig-Haro flow HH 396/397, spanning over 10 pc. We present new, high spatialand spectral resolution observations of the complex at near-infraredwavelengths ($2.0-2.3$ $\mu$m) using the LUCI near-infrared camera andspectrograph with the Advanced Rayleigh guided Ground layer adaptive OpticsSystem, ARGOS, at the Large Binocular Telescope. We discover a string oftightly collimated knots of H$_2$ emission, spanning the full observed field of$\sim4^\prime$, and determine an excitation temperature of $2600\pm500$ K forthe brightest knot, which is situated close to the driving source. We show thatthe kinematics of the knots are consistent with them being ejected from thecentral source on timescales of a few times $10^{2-3}$ years. The drivingsource (or sources) of the outflow is obscured at near-infrared wavelengths,possibly due to a thick accretion disk. The distribution of H$_2$ emission inthe region, together with high mass-infall rates reported recently, indicateG192 has undergone several large accretion bursts in the recent past.

New high-resolution near-infrared observations of the asymmetric jet of the massive young stellar object G192.16-3.82