A modified star formation law as a solution to open problems in galaxy evolution
文献类型：期刊论文
| 作者 | Wang, Lan1 ; Weinmann, Simone M.2; Neistein, Eyal3
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2012-04-01 |
| 卷号 | 421期号:4页码:3450-3463 |
| 关键词 | galaxies: evolution galaxies: formation galaxies: haloes galaxies: stellar content |
| 英文摘要 | In order to reproduce the low-mass end of the stellar mass function, most current models of galaxy evolution invoke very efficient supernova feedback. This solution seems to suffer from several shortcomings however, like predicting too little star formation (SF) in low-mass galaxies at z= 0. In this work, we explore modifications to the SF law as an alternative solution to achieve a match to the stellar mass function. This is done by applying semi-analytic models based on De Lucia & Blaizot, but with varying SF laws, to the Millennium and Millennium-II simulations, within the formalism developed by Neistein & Weinmann. Our best model includes lower SF efficiencies than predicted by the KennicuttSchmidt law at low stellar masses, no sharp threshold of cold gas mass for SF and an SF law that is independent of cosmic time. These simple modifications result in a model that is more successful than current standard models in reproducing various properties of galaxies less massive than 1010 M circle dot. The improvements include a good match to the observed autocorrelation function of galaxies, an evolution of the stellar mass function from z= 3 to z= 0 similar to observations and better agreement with observed specific SF rates. However, our modifications also lead to a dramatic overprediction of the cold mass content of galaxies. This shows that finding a successful model may require fine-tuning of both SF and supernova feedback, as well as improvements on gas cooling, or perhaps the inclusion of a yet unknown process which efficiently heats or expels gas at high redshifts. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000302620700062 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6345]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Max Planck Inst Astrophys, Partner Grp, Beijing, Peoples R China 2.Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands 3.Max Planck Inst Extraterr Phys, D-85748 Garching, Germany |
| 推荐引用方式 GB/T 7714 | Wang, Lan,Weinmann, Simone M.,Neistein, Eyal. A modified star formation law as a solution to open problems in galaxy evolution[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,421(4):3450-3463. |
| APA | Wang, Lan,Weinmann, Simone M.,&Neistein, Eyal.(2012).A modified star formation law as a solution to open problems in galaxy evolution.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,421(4),3450-3463. |
| MLA | Wang, Lan,et al."A modified star formation law as a solution to open problems in galaxy evolution".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 421.4(2012):3450-3463. |
入库方式： OAI收割
来源：国家天文台
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