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

Journal
Date Issued
2017
Author(s)
Csengeri, T.
•
Bontemps, S.
•
Wyrowski, F.
•
Motte, F.
•
Menten, K. M.
•
Beuther, H.
•
Bronfman, L.
•
Commerçon, B.
•
Chapillon, E.
•
Duarte-Cabral, A.
•
Fuller, G. A.
•
Henning, Th.
•
•
Longmore, S.
•
Palau, A.
•
Peretto, N.
•
Schuller, F.
•
Tan, J. C.
•
•
•
Urquhart, J. S.
DOI
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.

Full Table A.1 is only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/600/L10

Volume
600
Start page
L10
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2017A&A...600L..10C
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open.access
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