Evolution of fractality in centrally concentrated young clusters
Rattachement africain : kz, ca, cn. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
We investigate the structural evolution of young star clusters forming within centrally concentrated molecular clouds. Our simulations use the Torch framework, which integrates the FLASH magnetohydrodynamics code with the AMUSE environment, enabling a self-consistent treatment of gas dynamics, star formation, stellar evolution, radiative transfer, and gravitational interactions. We quantify cluster structure using the Q parameter for fractality and compute fractal dimensions via two methods: box-counting and correlation dimension. Our results show that clusters generally inherit fractal substructure from their parental clouds, which is typically erased within ∼2.5 tff through dynamical relaxation. Massive stars can induce the formation of secondary subclusters via feedback, with outcomes strongly dependent on stellar mass and formation timing. Interactions among subclusters, including mergers and dispersal, can extend fractal structure beyond 4tff. We also find systematic correlations between the fractality parameter Q and the fractal dimension: fractality is positively correlated with both the correlation and box-counting dimensions, with the correlation dimension exhibiting a stronger correlation. These results demonstrate how stellar feedback and internal dynamics jointly shape the measurable fractal properties of embedded star clusters.
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Le contrôle bibliographique ouvert
Où se fait cette recherche
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Al-Farabi Kazakh National University Department of Electronics and Astrophysics pays non établi dans la noticeUniversité ou école supérieure
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Nazarbayev University Energetic Cosmos Laboratory pays non établi dans la noticeUniversité ou école supérieure
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McMaster University Department of Physics and Astronomy pays non établi dans la noticeUniversité ou école supérieure
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Shanghai Normal University Shanghai Key Laboratory for Astrophysics pays non établi dans la noticeUniversité ou école supérieure
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Xi’an Jiaotong-Liverpool University Department of Physics pays non établi dans la noticeUniversité ou école supérieure
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Dushu Lake Science and Education Innovation District pays non établi dans la noticeInstitution
Department of Electronics and Astrophysics — Al-Farabi Kazakh National University, Energetic Cosmos Laboratory — Nazarbayev University et Department of Physics and Astronomy — McMaster University, avec 3 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.