Three-dimensional simulations of clump formation in stellar wind collisions
Author
dc.contributor.author
Calderón, D.
Author
dc.contributor.author
Cuadra, J.
Author
dc.contributor.author
Schartmann, M.
Author
dc.contributor.author
Burkert, A.
Author
dc.contributor.author
Prieto, J.
Author
dc.contributor.author
Russell, C. M. P.
Admission date
dc.date.accessioned
2020-07-06T22:15:14Z
Available date
dc.date.available
2020-07-06T22:15:14Z
Publication date
dc.date.issued
2020
Cita de ítem
dc.identifier.citation
MNRAS 493, 447–467 (2020)
es_ES
Identifier
dc.identifier.other
10.1093/mnras/staa090
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/175818
Abstract
dc.description.abstract
The inner parsec of our Galaxy contains tens of Wolf-Rayet stars whose powerful outflows are constantly interacting while filling the region with hot, diffuse plasma. Theoretical models have shown that, in some cases, the collision of stellar winds can generate cold, dense material in the form of clumps. However, their formation process and properties are not well understood yet. In this work, we present, for the first time, a statistical study of the clump formation process in unstable wind collisions. We study systems with dense outflows (similar to 10(-5) M-circle dot yr(-1)), wind speeds of 500-1500 km s(-1), and stellar separations of similar to 20-200 au. We develop three-dimensional high-resolution hydrodynamical simulations of stellar wind collisions with the adaptive-mesh refinement grid-based code RAMSES. We aim at characterizing the initial properties of clumps that form through hydrodynamic instabilities, mostly via the non-linear thin-shell instability (NTSI). Our results confirm that more massive clumps are formed in systems whose winds are close to the transition between the radiative and adiabatic regimes. Increasing either the wind speed or the degree of asymmetry increases the dispersion of the clump mass and ejection speed distributions. Nevertheless, the most massive clumps are very light (similar to 10(-3)-10(-2) M-circle plus), about three orders of magnitude less massive than theoretical upper limits. Applying these results to the Galactic Centre, we find that clumps formed through the NTSI should not be heavy enough either to affect the thermodynamic state of the region or to survive for long enough to fall on to the central supermassive black hole.
es_ES
Patrocinador
dc.description.sponsorship
Max Planck Society
Foundation CELLEX
CONICYT project Basal
AFB-170002
Excellence Cluster ORIGINS
German Research Foundation (DFG)
EXC-2094-390783311
CONICYTPCHA/Doctorado Nacional
2015-21151574
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT
3170870