Massive and red objects predicted by a semianalytical model of galaxy formation
文献类型：期刊论文
| 作者 | Kang, X.; Jing, Y. P.; Silk, J. |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2006-09-10 |
| 卷号 | 648期号:2页码:820-825 |
| 关键词 | galaxies : evolution galaxies : formation galaxies : luminosity function mass function |
| 英文摘要 | We study whether hierarchical galaxy formation in a concordance Lambda CDM universe can produce enough massive and red galaxies compared to the observations. We implement a semianalytical model in which the central black holes gain their mass during major mergers of galaxies and the energy feedback from active galaxy nuclei (AGNs) suppresses the gas cooling in their host halos. The energy feedback from AGNs acts effectively only in massive galaxies when supermassive black holes have been formed in the central bulges. Compared with previous models without black hole formation, our model predicts more massive and luminous galaxies at high redshift, agreeing with the observations of K20 up to z similar to 3. Also, the predicted stellar mass density from massive galaxies agrees with the observations of GDDS. Because of the energy feedback from AGNs, the formation of new stars is stopped in massive galaxies with the termination of gas cooling and these galaxies soon become red with color R - K > 5 (Vega magnitude), comparable to the extremely red objects (EROs) observed at redshift z similar to 1-2. Still, the predicted number density of very EROs is lower than observed at z similar to 2, and it may be related to inadequate descriptions of dust extinction, star formation history and AGN feedback in those luminous galaxies. |
| 学科主题 | 星系和宇宙学研究中心 |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | STAR-FORMING GALAXIES ; ORIGINS DEEP SURVEY ; N-BODY SIMULATIONS ; LUMINOSITY FUNCTION ; REDSHIFT SURVEY ; K20 SURVEY ; EVOLUTION ; RESOLUTION ; DENSITY ; SPECTROSCOPY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000240403600006 |
| 公开日期 | 2010-11-08 |
| 源URL | [http://119.78.226.72//handle/331011/11837]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Shanghai Astron Observ, Shanghai, Peoples R China 2.Univ Oxford, Oxford OX1 3RH, England |
| 推荐引用方式 GB/T 7714 | Kang, X.,Jing, Y. P.,Silk, J.. Massive and red objects predicted by a semianalytical model of galaxy formation[J]. ASTROPHYSICAL JOURNAL,2006,648(2):820-825. |
| APA | Kang, X.,Jing, Y. P.,&Silk, J..(2006).Massive and red objects predicted by a semianalytical model of galaxy formation.ASTROPHYSICAL JOURNAL,648(2),820-825. |
| MLA | Kang, X.,et al."Massive and red objects predicted by a semianalytical model of galaxy formation".ASTROPHYSICAL JOURNAL 648.2(2006):820-825. |
入库方式： OAI收割
来源：上海天文台
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