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|Title:||ALMA survey of massive cluster progenitors from ATLASGAL. Limited fragmentation at the early evolutionary stage of massive clumps||Authors:||Csengeri, T.
Menten, K. M.
Fuller, G. A.
Tan, J. C.
Urquhart, J. S.
|Issue Date:||2017||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||600||First Page:||L10||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<SUB>☉</SUB>, corresponding to massive dense cores (MDCs) with masses up to 400 M<SUB>☉</SUB>. 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. <P />Full Table A.1 is only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (<A href="http://126.96.36.199">http://188.8.131.52</A>) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/600/L10">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/600/L10</A>||URI:||http://hdl.handle.net/20.500.12386/26555||URL:||https://www.aanda.org/articles/aa/abs/2017/04/aa29754-16/aa29754-16.html||ISSN:||0004-6361||DOI:||10.1051/0004-6361/201629754||Bibcode ADS:||2017A&A...600L..10C||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Sep 26, 2020
checked on Sep 26, 2020
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