GREEN GALAXIES IN THE COSMOS FIELD
Pan, Zhizheng1,2,3; Kong, Xu1,2,3; Fan, Lulu1,2,3; Pan, ZZ (reprint author), Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2013-10-10
卷号776期号:1
DOI10.1088/0004-637X/776/1/14
收录类别SCI
关键词Galaxies: Evolution Galaxies: Formation Galaxies: Interactions Galaxies: Stellar Content
摘要We present research on the morphologies, spectra, and environments of approximate to 2350 "green valley" galaxies at 0.2 < z < 1.0 in the COSMOS field. The bimodality of dust-corrected NUV-r(+) color is used to define " green valley"; it removes dusty star-forming galaxies from galaxies that are truly transitioning between the blue cloud and the red sequence. Morphological parameters of green galaxies are intermediate between those of blue and red galaxy populations, both on the Gini-asymmetry and the Gini-M-20 planes. Approximately 60%-70% of green disk galaxies have intermediate or big bulges, and only 5%-10% are pure disk systems, based on morphological classification using the Zurich Estimator of Structural Types. The obtained average spectra of green galaxies are intermediate between blue and red ones in terms of [OII], H alpha, and H beta emission lines. Stellar population synthesis on the average spectra shows that green galaxies are on average older than blue galaxies but younger than red galaxies. Green galaxies and blue galaxies have similar projected galaxy density (Sigma(10)) distributions at z > 0.7. At z < 0.7, the fractions of M-* < 10(10.0) M-circle dot green galaxies located in a dense environment are found to be significantly larger than those of blue galaxies. The morphological and spectral properties of green galaxies are consistent with the transitioning population between the blue cloud and the red sequence. The possible mechanisms for quenching star formation activities in green galaxies are discussed. The importance of active galactic nucleus feedback cannot be well constrained in our study. Finally, our findings suggest that environmental conditions, most likely starvation and harassment, significantly affect the transformation of M-* < 10(10.0) M-circle dot blue galaxies into red galaxies, especially at z < 0.5.
项目资助者National Natural Science Foundation of China (NSFC)(11225315,11203023,NSFC,11320101002) ; Chinese Universities Scientific Fund (CUSF) ; Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP)(20123402110037) ; Open Research Program of the Key Laboratory for the Structure and Evolution of Celestial Objects, CAS
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:000324989000014
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ACTIVE GALACTIC NUCLEI ; STAR-FORMING GALAXIES ; DIGITAL SKY SURVEY ; SIMILAR-TO 1 ; SPECTRAL ENERGY-DISTRIBUTIONS ; MORPHOLOGY-DENSITY RELATION ; COLOR-MAGNITUDE DIAGRAM ; STELLAR MASS FUNCTION ; LESS-THAN 1.2 ; X-RAY
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9417
专题中国科学院天体结构与演化重点实验室
通讯作者Pan, ZZ (reprint author), Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China.
作者单位1.Center of Astrophysics, University of Science and Technology of China, Hefei 230026, China
2.Key Laboratory for Research in Galaxies and Cosmology, Chinese Academy of Sciences, Hefei 230026, China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
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GB/T 7714
Pan, Zhizheng,Kong, Xu,Fan, Lulu,et al. GREEN GALAXIES IN THE COSMOS FIELD[J]. ASTROPHYSICAL JOURNAL,2013,776(1).
APA Pan, Zhizheng,Kong, Xu,Fan, Lulu,&Pan, ZZ .(2013).GREEN GALAXIES IN THE COSMOS FIELD.ASTROPHYSICAL JOURNAL,776(1).
MLA Pan, Zhizheng,et al."GREEN GALAXIES IN THE COSMOS FIELD".ASTROPHYSICAL JOURNAL 776.1(2013).
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