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• W3081415987 endingPage "1707" @default.
• W3081415987 startingPage "1697" @default.
• W3081415987 abstract "ABSTRACT We propose a new model for the evolution of a star cluster’s system mass function (SMF). The model involves both turbulent fragmentation and competitive accretion. Turbulent fragmentation creates low-mass seed proto-systems (i.e. single and multiple protostars). Some of these low-mass seed proto-systems then grow by competitive accretion to produce the high-mass power-law tail of the SMF. Turbulent fragmentation is relatively inefficient, in the sense that the creation of low-mass seed proto-systems only consumes a fraction, ${sim }23{{ rm per cent}}$ (at most ${sim }50{{ rm per cent}}$), of the mass available for star formation. The remaining mass is consumed by competitive accretion. Provided the accretion rate on to a proto-system is approximately proportional to its mass (dm/dt ∝ m), the SMF develops a power-law tail at high masses with the Salpeter slope (∼−2.3). If the rate of supply of mass accelerates, the rate of proto-system formation also accelerates, as appears to be observed in many clusters. However, even if the rate of supply of mass decreases, or ceases and then resumes, the SMF evolves homologously, retaining the same overall shape, and the high-mass power-law tail simply extends to ever higher masses until the supply of gas runs out completely. The Chabrier SMF can be reproduced very accurately if the seed proto-systems have an approximately lognormal mass distribution with median mass ${sim } 0.11 , {rm M}_{odot }$ and logarithmic standard deviation $sigma _{log _{10}({M/M}_odot)}sim 0.47$)." @default.
• W3081415987 created "2020-09-01" @default.
• W3081415987 creator A5024376393 @default.
• W3081415987 creator A5087629520 @default.
• W3081415987 date "2020-10-21" @default.
• W3081415987 modified "2023-09-24" @default.
• W3081415987 title "On the emergent system mass function: the contest between accretion and fragmentation" @default.
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