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DOI | 10.1111/j.1365-2966.2009.14970.x |
The dependence of star formation on initial conditions and molecular cloud structure | |
Bate, Matthew R. | |
通讯作者 | Bate, Matthew R. |
来源期刊 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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ISSN | 0035-8711 |
EISSN | 1365-2966 |
出版年 | 2009 |
卷号 | 397期号:1页码:232-248 |
英文摘要 | We investigate the dependence of stellar properties on the initial kinematic structure of the gas in star-forming molecular clouds. We compare the results from two large-scale hydrodynamical simulations of star cluster formation that resolve the fragmentation process down to the opacity limit, the first of which was reported by Bate, Bonnell & Bromm. The initial conditions of the two calculations are identical, but in the new simulation the power spectrum of the velocity field imposed on the cloud initially and allowed to decay is biased in favour of large-scale motions. Whereas the calculation of Bate et al. began with a power spectrum P(k) proportional to k(-4) to match the Larson scaling relations for the turbulent motions observed in molecular clouds, the new calculation begins with a power spectrum P(k) proportional to k(-6). Despite this change to the initial motions in the cloud and the resulting density structure of the molecular cloud, the stellar properties resulting from the two calculations are indistinguishable. This demonstrates that the results of such hydrodynamical calculations of star cluster formation are relatively insensitive to the initial conditions. It is also consistent with the fact that the statistical properties of stars and brown dwarfs (e.g. the stellar initial mass function) are observed to be relatively invariant within our Galaxy and do not appear to depend on environment. |
英文关键词 | hydrodynamics binaries: general stars: formation stars: low-mass brown dwarfs stars: luminosity function mass function ISM: clouds |
类型 | Review |
语种 | 英语 |
国家 | England |
收录类别 | SCI-E |
WOS记录号 | WOS:000268923100040 |
WOS关键词 | MAIN-SEQUENCE STARS ; LOW-MASS STARS ; ADAPTIVE OPTICS SURVEY ; SMOOTHED PARTICLE HYDRODYNAMICS ; BROWN DWARF DESERT ; CLOSE BINARY-SYSTEMS ; COSMIC GAS CLOUDS ; STELLAR CLUSTERS ; FORMING REGIONS ; JEANS MASS |
WOS类目 | Astronomy & Astrophysics |
WOS研究方向 | Astronomy & Astrophysics |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/161976 |
作者单位 | (1)Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England |
推荐引用方式 GB/T 7714 | Bate, Matthew R.. The dependence of star formation on initial conditions and molecular cloud structure[J],2009,397(1):232-248. |
APA | Bate, Matthew R..(2009).The dependence of star formation on initial conditions and molecular cloud structure.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,397(1),232-248. |
MLA | Bate, Matthew R.."The dependence of star formation on initial conditions and molecular cloud structure".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 397.1(2009):232-248. |
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