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The early evolution of massive cluster progenitors is poorly understood. Weinvestigate the fragmentation properties from 0.3 pc to 0.06 pc scales of ahomogenous sample of infrared-quiet massive clumps within 4.5 kpc selected fromthe ATLASGAL survey. Using the ALMA 7m array we detect compact dust continuumemission towards all targets, and find that fragmentation, at these scales, islimited. The mass distribution of the fragments uncovers a large fraction ofcores above 40 $M_\odot$, corresponding to massive dense cores (MDCs) withmasses up to ~400 $M_\odot$. 77 % of the clumps contain at most 3 MDCs perclump, and we also reveal single clumps/MDCs. The most massive cores are formedwithin the more massive clumps, and a high concentration of mass on smallscales reveals a high core formation efficiency. The mass of MDCs highlyexceeds the local thermal Jeans-mass, and observational evidence is lacking fora sufficiently high level of turbulence or strong enough magnetic fields tokeep the most massive MDCs in equilibrium. If already collapsing, the observedfragmentation properties with a high core formation efficiency are consistentwith the collapse setting in at parsec scales.

ALMA survey of massive cluster progenitors from ATLASGAL. Limited fragmentation at the early evolutionary stage of massive clumps