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Marrone (1), Desika Narayanan (7, Jingzhe Ma (13), Joaquin Vieira (12), Justin S. Spilker (2), Katrina C. Litke (1), Kedar Phadke (12), Manuel Aravena (3), Matthieu B\\'ethermin (4), Scott Chapman (5), Sreevani Jarugula (12), Thomas R. Greve (8, Warren Morningstar (11), Yashar Hezaveh (11)","submitted_at":"2018-11-19T16:56:29Z","abstract_excerpt":"SPT0346-52 is one of the most most luminous and intensely star-forming galaxies in the universe, with L_FIR > 10^13 L_sol and Sigma_SFR ~ 4200 M_sol yr^-1 kpc^-2. In this paper, we present ~0.15'' ALMA observations of the [CII]158micron emission line in this z=5.7 dusty star-forming galaxy. We use a pixellated lensing reconstruction code to spatially and kinematically resolve the source-plane [CII] and rest-frame 158 micron dust continuum structure at ~700 pc (~0.12'') resolution. We discuss the [CII] deficit with a pixellated study of the L_[CII]/L_FIR ratio in the source plane. 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