期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 462, 期 2, 页码 1307-1328出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw1728
关键词
stars: formation; stars: Population III; galaxies: formation; cosmology: theory; early Universe
资金
- NSF [AST-1413501, AST-1211729]
- NASA [NNX13AB84G]
- University of California
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1413501] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1211729] Funding Source: National Science Foundation
We simulate the growth of a Population III stellar system, starting from cosmological initial conditions at z = 100. We follow the formation of a minihalo and the subsequent collapse of its central gas to high densities, resolving scales as small as similar to 1 au. Using sink particles to represent the growing protostars, we model the growth of the photodissociating and ionizing region around the first sink, continuing the simulation for similar to 5000 yr after initial protostar formation. Along with the first-forming sink, several tens of secondary sinks form before an ionization front develops around the most massive star. The resulting cluster has high rates of sink formation, ejections from the stellar disc, and sink mergers during the first similar to 2000 yr, before the onset of radiative feedback. By this time, a warm similar to 5000 K phase of neutral gas has expanded to roughly the disc radius of 2000 au, slowing mass flow on to the disc and sinks. By 5000 yr the most massive star grows to 20 M-circle dot, while the total stellar mass approaches 75 M-circle dot. Out of the similar to 40 sinks, approximately 30 are low mass (M* < 1 M-circle dot), and if the simulation had resolved smaller scales an even greater number of sinks might have formed. Thus, protostellar radiative feedback is insufficient to prevent rapid disc fragmentation and the formation of a high-member Pop III cluster before an ionization front emerges. Throughout the simulation, the majority of stellar mass is contained within the most massive stars, further implying that the Pop III initial mass function is top-heavy.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据