Star formation and metallicity gradients in semi-analytic models of disc galaxy formation
文献类型：期刊论文
| 作者 | Fu, Jian1,2; Kauffmann, Guinevere1; Huang, Mei-ling1; Yates, Robert M.1; Moran, Sean3; Heckman, Timothy M.4; Dave, Romeel5; Guo, Qi6,7 ; Henriques, Bruno M. B.1
|
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2013-09-01 |
| 卷号 | 434期号:2页码:1531-1548 |
| 关键词 | stars: formation ISM: atoms ISM: molecules galaxies: evolution galaxies: formation galaxies: ISM |
| 英文摘要 | We have updated our radially resolved semi-analytic models (SAMs) of galaxy formation, which track both the atomic and molecular gas phases of the interstellar medium. The models are adapted from those of Guo et al. using similar methodology as by Fu et al. and are run on halo merger trees from the Millennium and Millennium-II simulations with the following main changes. (1) We adopt a simple star formation law Sigma(SFR) Sigma(H2). (2) We inject the heavy elements produced by supernovae directly into the halo hot gas, instead of first mixing them with the cold gas in the disc. (3) We include radial gas inflows in discs using a model of the form v(inflow) = alpha r. The models are used to study the radial profiles of star formation rate and gas-phase metallicity in present-day galaxies. The surface density profiles of molecular gas in L-* galaxies place strong constraints on inflow velocities, favouring models where v(inflow) similar to 7 km s(-1) at a galactocentric radius of 10 kpc. Radial gas inflow has little influence on gas-phase and stellar metallicity gradients, which are affected much more strongly by the fraction of metals that are directly injected into the halo gas, rather than mixed with the cold gas. Metals ejected out of the galaxy in early epochs result in late infall of pre-enriched gas and flatter present-day gas-phase metallicity gradients. A prescription in which 80 per cent of the metals are injected into the halo gas results in good fits to the flat observed metallicity gradients in galaxies with stellar masses greater than 10(10) M-circle dot, as well as the relations between gas-phase metallicity and specific star formation rate in the outer parts of galactic discs. We examine the correlation between the gas-phase metallicity gradient and global galaxy properties, finding that it is most strongly correlated with the bulge-to-total ratio of the galaxy. This is because gas is consumed when the bulge forms during galaxy mergers, and the gas-phase metallicity gradient is then set by newly accreted gas. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000323638200046 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5826]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Max Planck Inst Astrophys, D-85741 Garching, Germany 2.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 3.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 4.Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA 5.Univ Arizona, Dept Astron, Tucson, AZ 85721 USA 6.Univ Durham, Inst Computat Cosmol, Dept Phys, Durham DH1 3LE, England 7.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Fu, Jian,Kauffmann, Guinevere,Huang, Mei-ling,et al. Star formation and metallicity gradients in semi-analytic models of disc galaxy formation[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,434(2):1531-1548. |
| APA | Fu, Jian.,Kauffmann, Guinevere.,Huang, Mei-ling.,Yates, Robert M..,Moran, Sean.,...&Henriques, Bruno M. B..(2013).Star formation and metallicity gradients in semi-analytic models of disc galaxy formation.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,434(2),1531-1548. |
| MLA | Fu, Jian,et al."Star formation and metallicity gradients in semi-analytic models of disc galaxy formation".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 434.2(2013):1531-1548. |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。