PASSIVE AND STAR-FORMING GALAXIES AT 1.4 <= z <= 2.5 IN THE AEGIS FIELD
Fang, Guanwen1,2,3; Kong, Xu1,3,4; Chen, Yang1; Lin, Xuanbin1,4; Fang, GW (reprint author), Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2012-06-01
卷号751期号:2
DOI10.1088/0004-637X/751/2/109
收录类别SCI
关键词Cosmology: Observations Galaxies: Evolution Galaxies: Formation Galaxies: High-redshift Galaxies: Photometry
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).
项目资助者NSF ; NASA(NAS5-26555) ; STFC ; National Natural Science Foundation of China (NSFC)(10873012) ; Key Laboratory for the Structure and Evolution of Celestial Objects, CAS ; Chinese Universities Scientific Fund (CUSF)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000304204600030
WOS研究方向Astronomy & Astrophysics
WOS类目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
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9430
专题中国科学院天体结构与演化重点实验室
通讯作者Fang, GW (reprint author), Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China.
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
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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,&Fang, GW .(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).
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