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Galactic accretion and the outer structure of galaxies in the CDM model
文献类型：期刊论文
| 作者 | Cooper, Andrew P.1,2; D'Souza, Richard1; Kauffmann, Guinevere1; Wang, Jing1 ; Boylan-Kolchin, Michael3; Guo, Qi2,4; Frenk, Carlos S.4; White, Simon D. M.1
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2013-10-01 |
| 卷号 | 434期号:4页码:3348-3367 |
| 关键词 | methods: numerical galaxies: elliptical and lenticular, cD galaxies: evolution galaxies: fundamental parameters galaxies: haloes galaxies: structure |
| 英文摘要 | We have combined the semi-analytic galaxy formation model of Guo et al. with the particle-tagging technique of Cooper et al. to predict galaxy surface brightness profiles in a representative sample of similar to 1900 massive dark matter haloes (10(12)-10(14)M(circle dot)) from the Millennium II Lambda cold dark matter N-body simulation. Here, we present our method and basic results focusing on the outer regions of galaxies, consisting of stars accreted in mergers. These simulations cover scales from the stellar haloes of Milky Way-like galaxies to the 'cD envelopes' of groups and clusters, and resolve low surface brightness substructure such as tidal streams. We find that the surface density of accreted stellar mass around the central galaxies of dark matter haloes is well described by a Sersic profile, the radial scale and amplitude of which vary systematically with halo mass (M-200). The total stellar mass surface density profile breaks at the radius where accreted stars start to dominate over stars formed in the galaxy itself. This break disappears with increasing M-200 because accreted stars contribute more of the total mass of galaxies, and is less distinct when the same galaxies are averaged in bins of stellar mass, because of scatter in the relation between M-star and M-200. To test our model, we have derived average stellar mass surface density profiles for massive galaxies at z approximate to 0.08 by stacking Sloan Digital Sky Survey images. Our model agrees well with these stacked profiles and with other data from the literature and makes predictions that can be more rigorously tested by future surveys that extend the analysis of the outer structure of galaxies to fainter isophotes. We conclude that it is likely that the outer structure of the spheroidal components of galaxies is largely determined by collisionless merging during their hierarchical assembly. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000325262300053 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5960]  |
| 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-85748 Garching, Germany 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Univ Calif Irvine, Dept Phys & Astron, Ctr Cosmol, Irvine, CA 92697 USA 4.Univ Durham, Dept Phys, Inst Computat Cosmol, Durham DH1 3LE, England |
| 推荐引用方式 GB/T 7714 | Cooper, Andrew P.,D'Souza, Richard,Kauffmann, Guinevere,et al. Galactic accretion and the outer structure of galaxies in the CDM model[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,434(4):3348-3367. |
| APA | Cooper, Andrew P..,D'Souza, Richard.,Kauffmann, Guinevere.,Wang, Jing.,Boylan-Kolchin, Michael.,...&White, Simon D. M..(2013).Galactic accretion and the outer structure of galaxies in the CDM model.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,434(4),3348-3367. |
| MLA | Cooper, Andrew P.,et al."Galactic accretion and the outer structure of galaxies in the CDM model".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 434.4(2013):3348-3367. |
入库方式： OAI收割
来源：国家天文台
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