PASSIVE AND STAR-FORMING GALAXIES AT 1.4 <= z <= 2.5 IN THE AEGIS FIELD
文献类型：期刊论文
| 作者 | Fang, Guanwen1,2,3; Kong, Xu1,3,4; Chen, Yang1; Lin, Xuanbin1,4 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2012-06-01 |
| 卷号 | 751期号:2 |
| 关键词 | cosmology: observations galaxies: evolution galaxies: formation galaxies: high-redshift galaxies: photometry |
| ISSN号 | 0004-637X |
| 通讯作者 | Fang, GW (reprint author), Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China. |
| 英文摘要 | Using a simple two-color selection based on g-, z-, and K-band photometry, we choose from 1609 star-forming galaxies (sgzKs) and 422 passively evolving galaxies (pgzKs) at z similar to 2 from a K-band-selected sample (K-AB < 22.0) in an area of similar to 0.44 deg(2) of the All-wavelength Extended Groth Strip International Survey. The number of counts of pgzKs in our sample turn over at K-AB similar to 21.0, and both the number of faint and bright objects (including sgzKs and pgzKs) exceed the predictions of a recent semi-analytic model of galaxy formation; a more successful model is need to explain this diversity. We also find that the star formation rate (SFR) and specific SFR (sSFR) of sgzKs increases with redshift at all masses, implying that star-forming galaxies were much more active on average in the past. Moreover, the sSFR of massive galaxies is lower at all redshifts, suggesting that star formation contributes more to the mass growth of low-mass galaxies than to high-mass galaxies. From the Hubble Space Telescope Wide Field Camera 3 near-infrared imaging data we find that morphologies of z similar to 2 galaxies not only have diffuse structures with lower G and higher M-20 values, but also have single-object morphologies (higher G and lower M20), implying that there are morphological variety and different formation process for these galaxies at z similar to 2. Finally, we also study the fraction of active galactic nuclei (AGNs) in the gzKs, 82 of 828 gzKs with four IRAC bands can be classified as AGNs (similar to 10%). Most of these AGN candidates have L0.5-10 keV > 10(41) erg s(-1). |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | EXTENDED GROTH STRIP ; EXTRAGALACTIC LEGACY SURVEY ; NEAR-INFRARED SPECTROSCOPY ; ACTIVE GALACTIC NUCLEI ; STELLAR MASS FUNCTION ; EXTREMELY RED OBJECTS ; K-SELECTED GALAXIES ; WIDE AREA SURVEY ; HIGH-REDSHIFT ; QUIESCENT GALAXIES |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/article/10.1088/0004-637X/751/2/109/meta |
| 语种 | 英语 |
| WOS记录号 | WOS:000304204600030 |
| 公开日期 | 2016-06-01 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/9430]  |
| 专题 | 云南天文台_中国科学院天体结构与演化重点实验室 |
| 作者单位 | 1.Center for Astrophysics, University of Science and Technology of China, Hefei 230026, China 2.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA 3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China 4.Key Laboratory for Research in Galaxies and Cosmology, USTC, Chinese Academy of Sciences, Hefei 230026, China |
| 推荐引用方式 GB/T 7714 | Fang, Guanwen,Kong, Xu,Chen, Yang,et al. PASSIVE AND STAR-FORMING GALAXIES AT 1.4 <= z <= 2.5 IN THE AEGIS FIELD[J]. ASTROPHYSICAL JOURNAL,2012,751(2). |
| APA | Fang, Guanwen,Kong, Xu,Chen, Yang,&Lin, Xuanbin.(2012).PASSIVE AND STAR-FORMING GALAXIES AT 1.4 <= z <= 2.5 IN THE AEGIS FIELD.ASTROPHYSICAL JOURNAL,751(2). |
| MLA | Fang, Guanwen,et al."PASSIVE AND STAR-FORMING GALAXIES AT 1.4 <= z <= 2.5 IN THE AEGIS FIELD".ASTROPHYSICAL JOURNAL 751.2(2012). |
入库方式： OAI收割
来源：云南天文台
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