Traficante, A., Duarte Cabral, Ana  ORCID: https://orcid.org/0000-0002-5259-4774, Elia, D., Fuller, G. A., Merello, M., Molinari, S., Peretto, N. ORCID: https://orcid.org/0000-0002-6893-602X, Schisano, E. and Di Giorgio, A.
2018.
Testing the Larson relations in massive clumps.
Monthly Notices of the Royal Astronomical Society
477
(2)
, pp. 2220-2242.
10.1093/mnras/sty798
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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 αvir on mass (and radius) is only a function of the gravitational energy, independent of the kinetic energy of the system; thus, αvir 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⊙) clumps in the sample, where exceptionally high magnetic fields might not be enough to stabilize the collapse.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Physics and Astronomy |
| Publisher: | Oxford University Press |
| ISSN: | 0035-8711 |
| Date of First Compliant Deposit: | 29 May 2018 |
| Date of Acceptance: | 22 March 2018 |
| Last Modified: | 05 May 2023 10:55 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/111804 |
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