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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/30830
Title: Testing the Larson relations in massive clumps
Authors: TRAFICANTE, ALESSIO 
Duarte-Cabral, A.
ELIA, Davide Quintino 
Fuller, G. A.
Merello, M.
MOLINARI, Sergio 
Peretto, N.
SCHISANO, EUGENIO 
DI GIORGIO, Anna Maria 
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 477
Issue: 2
First Page: 2220
Abstract: We tested the validity of the three Larson relations in a sample of 213 massive clumps selected from the Herschel infrared Galactic Plane (Hi-GAL) survey, also using data from the Millimetre Astronomy Legacy Team 90 GHz (MALT90) survey of 3-mm emission lines. The clumps are divided into five evolutionary stages so that we can also discuss the Larson relations as a function of evolution. We show that this ensemble does not follow the three Larson relations, regardless of the clump's evolutionary phase. A consequence of this breakdown is that the dependence of the virial parameter α<SUB>vir</SUB> on mass (and radius) is only a function of the gravitational energy, independent of the kinetic energy of the system; thus, α<SUB>vir</SUB> is not a good descriptor of clump dynamics. Our results suggest that clumps with clear signatures of infall motions are statistically indistinguishable from clumps with no such signatures. The observed non-thermal motions are not necessarily ascribed to turbulence acting to sustain the gravity, but they might be a result of the gravitational collapse at the clump scales. This seems to be particularly true for the most massive (M ≥ 1000 M<SUB>☉</SUB>) clumps in the sample, where exceptionally high magnetic fields might not be enough to stabilize the collapse.
URI: http://hdl.handle.net/20.500.12386/30830
URL: https://academic.oup.com/mnras/article/477/2/2220/4990719
ISSN: 0035-8711
DOI: 10.1093/mnras/sty798
Bibcode ADS: 2018MNRAS.477.2220T
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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