Shingo NOZAKI (Graduate School of Science) paper has been accepted for The Astrophysical Journal.
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Authors
Shingo Nozaki, Hajime Fukushima, Kazuki Tokuda, Masahiro N. Machida
Affiliation
Graduate School of Science, Department of Earth and Planetary Sciences
Manuscript Title
Tracking Star-Forming Cores as Mass Reservoirs in Clustered and Isolated Regions Using Numerical Passive Tracer Particles
Abstract
Understanding the physical properties of star-forming cores as mass reservoirs for protostars, and the impact of turbulence, is crucial in star formation studies. We implemented passive tracer particles in clump-scale numerical simulations with turbulence strengths of Mrms=2,10. Unlike core identification methods used in observational studies, we identified 260 star-forming cores using a new method based on tracer particles falling onto protostars. Our findings reveal that star-forming cores do not necessarily coincide with high-density regions when nearby stars are present, as gas selectively accretes onto protostars, leading to clumpy, fragmented structures. We calculated convex hull cores from star-forming cores and defined their filling factors. Regardless of turbulence strength, convex hull cores with lower filling factors tend to contain more protostars and have larger masses and sizes, indicating that cores in clustered regions are more massive and larger than those in isolated regions. Thus, the filling factor serves as a key indicator for distinguishing between isolated and clustered star-forming regions and may provide insights into the star formation processes within clustered regions. We also found that most convex hull cores are gravitationally bound. However, in the Mrms=10 model, there are more low-mass, unbound convex hull cores compared to the Mrms=2 model. In the Mrms=10 model, 16% of the convex hull cores are unbound, which may be explained by the inertial-inflow model. These findings highlight the influence of turbulence strength on the mass and gravitational stability of cores.
Journal name
The Astrophysical Journal
Relevant SDGs
SDGs 4(Quality education), SDGs 9(Industry, Innovation, Technology and Infrastructure) ,SDGS 17(Partnerships for the goals)
Comments
I’m Shingo Nozaki, a first-year doctoral student at the Graduate School of Science.
My research focuses on quantitatively investigating how gas accrete onto protostars, using large-scale numerical simulations of star-forming regions. For more details, please visit the related links below.
