ALMA survey of massive cluster progenitors from ATLASGAL: Limited fragmentation at the early evolutionary stage of massive clumps
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2017Metadata
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Csengeri, T.
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ALMA survey of massive cluster progenitors from ATLASGAL: Limited fragmentation at the early evolutionary stage of massive clumps
Author
- Csengeri, T.;
- Bontemps, S.;
- Wyrowski, F.;
- Motte, F.;
- Menten, K. M.;
- Beuther, H.;
- Bronfman Aguiló, Leonardo;
- Commerçon, B.;
- Chapillón, E.;
- Duarte Cabral, A.;
- Fuller, G. A.;
- Henning, Th;
- Leurini, S.;
- Longmore, S.;
- Palau, A.;
- Peretto, N.;
- Schuller, F.;
- Tan, J. C.;
- Testi, L.;
- Traficante, A.;
- Urquhart, J. S.;
Abstract
The early evolution of massive cluster progenitors is poorly understood. We investigate the fragmentation properties from 0.3 pc to 0.06 pc scalesof a homogenous sample of infrared-quiet massive clumps within 4.5 kpc selected from the ATLASGAL survey. Using the ALMA 7 m array wedetect compact dust continuum emission towards all targets and find that fragmentation, at these scales, is limited. The mass distribution of thefragments uncovers a large fraction of cores above 40M, corresponding to massive dense cores (MDCs) with masses up to∼400M. 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 formedwithin the more massive clumps and a high concentration of mass on small scales reveals a high core formation efficiency. The mass of MDCshighly exceeds the local thermal Jeans mass, and we lack the observational evidence of a sufficiently high level of turbulence or strong enoughmagnetic fields to keep the most massive MDCs in equilibrium. If already collapsing, the observed fragmentation properties with a high coreformation efficiency are consistent with the collapse setting in at parsec scales.
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Artículo de publicación SCOPUS
Identifier
URI: https://repositorio.uchile.cl/handle/2250/168893
DOI: 10.1051/0004-6361/201629754
ISSN: 14320746
00046361
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A&A 600, L10 (2017)
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