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SPT0346-52 (z=5.7) is the most intensely star-forming galaxy discovered bythe South Pole Telescope, with Sigma_SFR ~ 4200 Msol yr^-1 kpc^-2. In thispaper, we expand on previous spatially-resolved studies, using ALMAobservations of dust continuum, [NII]205 micron, [CII]158 micron, [OI]146micron, and undetected [NII]122 micron and [OI]63 micron emission to study themulti-phase interstellar medium (ISM) in SPT0346-52. We use pixelated,visibility-based lens modeling to reconstruct the source-plane emission. Wealso model the source-plane emission using the photoionization code CLOUDY andfind a supersolar metallicity system. We calculate T_dust = 48.3 K andlambda_peak = 80 micron, and see line deficits in all five lines. The ionizedgas is less dense than comparable galaxies, with n_e < 32 cm^-3, while ~20% ofthe [CII]158 emission originates from the ionized phase of the ISM. We alsocalculate the masses of several phases of the ISM. We find that molecular gasdominates the mass of the ISM in SPT0346-52, with the molecular gas mass ~4xhigher than the neutral atomic gas mass and ~100x higher than the ionized gasmass.

Multi-Phase ISM in the z = 5.7 Hyperluminous Starburst SPT0346-52