The initial mass function of the rich young cluster NGC 1818 in the Large Magellanic Cloud
文献类型：期刊论文
| 作者 | Liu, Q.1,2; de Grijs, R.1,3; Deng, L. C.1; Hu, Y.1,2 ; Baraffe, I.4; Beaulieu, S. F.5,6
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2009-07-01 |
| 卷号 | 396期号:3页码:1665-1674 |
| 关键词 | stars: low-mass, brown dwarfs stars: luminosity function, mass function stars: pre-main-sequence Magellanic Clouds galaxies: star clusters |
| 英文摘要 | We use deep Hubble Space Telescope photometry of the rich, young (similar to 20- to 45-Myr old) star cluster NGC 1818 in the Large Magellanic Cloud to derive its stellar mass function (MF) down to similar to 0.15 M(circle dot). This represents the deepest robust MF thus far obtained for a stellar system in an extragalactic, low-metallicity ([Fe/H] similar or equal to -0.4 dex) environment. Combining our results with the published MF for masses above 1.0 M(circle dot), we obtain a complete present-day MF. This is a good representation of the cluster's initial MF (IMF), particularly at low masses, because our observations are centred on the cluster's uncrowded half-mass radius. Therefore, stellar and dynamical evolution of the cluster will not have affected the low-mass stars significantly. The NGC 1818 IMF is well described by both a lognormal and a broken power-law distribution with slopes of Gamma = 0.46 +/- 0.10 and Gamma similar or equal to -1.35 (Salpeter-like) for masses in the range from 0.15 to 0.8 M(circle dot) and greater than 0.8 M(circle dot), respectively. Within the uncertainties, the NGC 1818 IMF is fully consistent with both the Kroupa solar neighbourhood and the Chabrier lognormal mass distributions. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000267072100040 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7574]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England 4.Ecole Normale Super, CRAL, F-69007 Lyon, France 5.Univ Laval, Dept Genie Phys & Opt, Quebec City, PQ G1V 0A6, Canada 6.Univ Laval, Ctr Rech Astrophys Quebec, Quebec City, PQ G1V 0A6, Canada |
| 推荐引用方式 GB/T 7714 | Liu, Q.,de Grijs, R.,Deng, L. C.,et al. The initial mass function of the rich young cluster NGC 1818 in the Large Magellanic Cloud[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2009,396(3):1665-1674. |
| APA | Liu, Q.,de Grijs, R.,Deng, L. C.,Hu, Y.,Baraffe, I.,&Beaulieu, S. F..(2009).The initial mass function of the rich young cluster NGC 1818 in the Large Magellanic Cloud.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,396(3),1665-1674. |
| MLA | Liu, Q.,et al."The initial mass function of the rich young cluster NGC 1818 in the Large Magellanic Cloud".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 396.3(2009):1665-1674. |
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来源：国家天文台
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