Fundamental Research Division
The DRF at the CEA assemble approximately 6,000 scientists since January 2016.
Scientific result | Stars
Thanks to massively parallel computers and adaptive mesh refinement, astrophysicists from IRFU have succeeded in simulating the complete transformation of the molecular cloud into stellar clusters. In particular, they have provided evidence for a gaseous proto-cluster whose structure is maintained during star formation.
From observations, the scientists were able to highlight a remarkable property of these gaseous proto-clusters: their mass is proportional to the square of their radius, for total masses varying from one hundred to ten thousand solar masses.
They have also developed a simplified analytical model that describes the main physical mechanisms at work. With this model, they were able to successfully reproduce the relationship between the mass and the radius of the cluster, as deduced from the observations, as well as the shape of the proto-clusters.
The next step will be to introduce the feedbacks of stars on their environment in computer simulations, such as stellar winds or supernova explosions. The evolution of the cluster will be reconstructed in a ways that are even closer to reality.
Formation of a protocluster: A virialized structure from gravoturbulent collapse. I. Simulation of cluster formation in a collapsing molecular cloud, Astronomy and Astrophysics.
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