Multi-scale dynamics in star-forming regions: The interplay between gravity and turbulence

Bouscasse, L., Traficante, Alessio, Fuller, Gary A., Duarte Cabral, Ana ORCID: https://orcid.org/0000-0002-5259-4774, Elia, Davide, Heyer, Mark H., Molinari, Sergio, Peretto, Nicolas ORCID: https://orcid.org/0000-0002-6893-602X, Schisano, Eugenio, Kramer, C. and Gueth, F. 2022. Multi-scale dynamics in star-forming regions: The interplay between gravity and turbulence. Presented at: IRAM Conference Multi-line Diagnostics of the Interstellar Medium, Nice, France, 4-6 April 2022. EPJ Web of Conferences. , vol.265 Società Italiana di Fisica, 10.1051/epjconf/202226500016

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Abstract

In the multi-scale view of the star formation process the material flows from large molecular clouds down to clumps and cores. In this paradigm it is still unclear if it is gravity or turbulence that drives the observed supersonic non-thermal motions during the collapse, in particular in high-mass regions, and at which scales gravity becomes eventually dominant over the turbulence of the interstellar medium. To investigate this problem we have combined the dynamics of a sample of 70 μm-quiet clumps, selected to cover a wide range of masses and surface densities, with the dynamics of the parent filaments in which they are embedded. We observe a continuous interplay between turbulence and gravity, where the former creates structures at all scales and the latter takes the lead when a critical value of the surface density is reached, Σth = 0.1 g cm−2. In the densest filaments this transition can occur at the parsec, or even larger scales, leading to a global collapse of the whole region and most likely to the formation of the massive objects.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Published Online
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Società Italiana di Fisica
ISSN:	2100-014X
Date of First Compliant Deposit:	15 February 2023
Date of Acceptance:	7 September 2022
Last Modified:	16 Feb 2023 12:36
URI:	https://orca.cardiff.ac.uk/id/eprint/157048

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