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

Csengeri, T., Bontemps, S., Wyrowski, F., Motte, F., Menten, K. M., Beuther, H., Bronfman, L., Commercon, B., Chapillon, E., Duarte Cabral, Ana, Fuller, G. A., Henning, Th., Leurini, S., Longmore, S., Palau, A., Peretto, Nicolas, Schuller, F., Tan, J. C., Testi, L., Traficante, A. and Urquhart, J. S. 2017. ALMA survey of massive cluster progenitors from ATLASGAL Limited fragmentation at the early evolutionary stage of massive clumps. Astronomy and Astrophysics 600 , L10.

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Abstract

The early evolution of massive cluster progenitors is poorly understood. We investigate the fragmentation properties from 0.3 pc to 0.06 pc scales of a homogenous sample of infrared-quiet massive clumps within 4.5 kpc selected from the ATLASGAL survey. Using the ALMA 7 m array we detect compact dust continuum emission towards all targets and find that fragmentation, at these scales, is limited. The mass distribution of the fragments uncovers a large fraction of cores above 40 M⊙, corresponding to massive dense cores (MDCs) with masses up to ~400 M⊙. Seventy-seven percent of the clumps contain at most 3 MDCs per clump, and we also reveal single clumps/MDCs. The most massive cores are formed within the more massive clumps and a high concentration of mass on small scales reveals a high core formation efficiency. The mass of MDCs highly exceeds the local thermal Jeans mass, and we lack the observational evidence of a sufficiently high level of turbulence or strong enough magnetic fields to keep the most massive MDCs in equilibrium. If already collapsing, the observed fragmentation properties with a high core formation efficiency are consistent with the collapse setting in at parsec scales.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: EDP Sciences
ISSN: 0004-6361
Date of First Compliant Deposit: 9 June 2017
Date of Acceptance: 1 March 2017
Last Modified: 22 Sep 2017 14:48
URI: http://orca-mwe.cf.ac.uk/id/eprint/101246

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