EPJ Web of Conferences 265, 00016 (2022)
https://doi.org/10.1051/epjconf/202226500016

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

¹ IAPS - INAF, via Fosso del Cavaliere, 100, 00133 Roma, Italy
² Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
³ School of Physics and Astronomy, Cardiff University, Queens Buildings, The Parade, Cardiff CF24 3AA, UK
⁴ Department of Astronomy, University of Massachusetts, Amherst, MA 01003, USA

^* e-mail: alessio.traficante@inaf.it

Published online: 7 September 2022

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, Σ_th = 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.