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We report 350 and 230 GHz observations of molecular gas and dust in thestarburst nucleus of NGC 253 at 20-40 pc (1"-2") resolution. The data containCO(3-2), HCN(4-3), CO(2-1), 13CO(2-1), C18O(2-1), and continuum at 0.87 mm and1.3 mm toward the central kiloparsec. The CO(2-1) size of the galaxy's centralmolecular zone (CMZ) is measured to be about 300 pc x 100 pc at the halfmaximum of intensity. Five clumps of dense and warm gas stand out in the CMZ atarcsecond resolution, and they are associated with compact radio sources due torecent massive star formation. They contribute one third of the CO emission inthe central 300 pc and have 12CO peak brightness temperatures around 50 K,molecular gas column densities on the order of 10^{4} Msun pc^{-2}, gas masseson the order of 10^{7} Msun in the size scale of 20 pc, volume-averaged gasdensities of n(H2) ~ 4000 cm^{-3}, and high HCN-to-CO ratios suggestive ofhigher fractions of dense gas than in the surrounding environment. It issuggested that these are natal molecular cloud complexes of massive starformation. The CMZ of NGC 253 is also compared with that of our Galaxy inCO(2-1) at the same 20 pc resolution. Their overall gas distributions arestrikingly similar. The five molecular cloud complexes appear to be akin tosuch molecular complexes as Sgr A, Sgr B2, Sgr C, and the l=1.3deg cloud in theGalactic center. On the other hand, the starburst CMZ in NGC 253 has highertemperatures and higher surface (and presumably volume) densities than itsnon-starburst cousin.

Star-forming Cloud Complexes in the Central Molecular Zone of NGC 253