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Near-infrared integral-field spectroscopy of redshifted [O III], H-beta andoptical continuum emission from z=3.8 radio galaxy 4C+41.17 is presented,obtained with the laser-guide-star adaptive optics facility on the Gemini Northtelescope. Employing a specialized dithering technique, a spatial resolution of0.10 arcsec or 0.7 kpc is achieved in each spectral element, with velocityresolution of ~70 km/s. Spectra similar to local starbursts are found forbright knots coincident in archival Hubble Space Telescope (HST)restframe-ultraviolet images, which also allows a key line diagnostic to bemapped together with new kinematic information. There emerges a clearer pictureof the nebular emission associated with the jet in 8.3 GHz and 15 GHz VeryLarge Array maps, closely tied to a Ly-alpha-bright shell-shaped structure seenwith HST. This supports a previous interpretation of that arc tracing a bowshock, inducing 10^10-11 M_solar star-formation regions that comprise theclumpy broadband optical/ultraviolet morphology near the core.

A Star-Forming Shock Front in Radio Galaxy 4C+41.17 Resolved with Laser-Assisted Adaptive Optics Spectroscopy