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《天文和天体物理学研究(英文版)》 2015-06
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Morphology and structure of BzK-selected galaxies at z ~ 2 in the CANDELS-COSMOS field

Guan-Wen Fang;Zhong-Yang Ma;Yang Chen;Xu Kong;Institute for Astronomy and History of Science and Technology, Dali University;Key Laboratory for Research in Galaxies and Cosmology, University of Science and Technology of China, Chinese Academy of Sciences;Center for Astrophysics, University of Science and Technology of China;SISSA,via Bonomea 265, I-34136 Trieste, Italy;  
Utilizing a Bz K-selection technique, we obtain 14 550 star-forming galaxies(sB z Ks) and 1763 passive galaxies(p Bz Ks) at z ~ 2 from the K-selected(KAB 22.5) catalog in the COSMOS/Ultra VISTA field. The differential number counts of sB z Ks and p Bz Ks are consistent with the results from the literature.Compared to the observed results, semi-analytic models of galaxy formation and evolution provide too few(many) galaxies at the high(low) mass end. Moreover, we find that the star formation rate and stellar mass of sB z Ks follow the relation of the main sequence. Based on HST/Wide Field Camera 3 F160 W imaging, we find a wide range of morphological diversities for sB z Ks, from diffuse to early-type spiral structures, with relatively high M20, large size and low G, while p Bz Ks have elliptical-like compact morphologies with lower M20, smaller size and higher G, indicating a more concentrated and symmetric spatial extent of stellar population distribution in p Bz Ks than sB z Ks. Furthermore, the sizes of p Bz Ks(sB z Ks) at z ~ 2 are on average two to three(one to two) times smaller than those of local early-type(late-type) galaxies with similar stellar mass. Our findings imply that the two classes have different evolution models and mass assembly histories.
【Fund】: Supported by the National Natural Science Foundation of China
【CateGory Index】: P152
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【Co-citations】
Chinese Journal Full-text Database 4 Hits
1 Xin-Fa Deng;School of Science,Nanchang University;;Comparison of some properties of star forming galaxies and active galactic nuclei between two BOSS galaxy samples from SDSS DR9[J];天文和天体物理学研究(英文版);2014-04
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3 Zhi-Xin Peng;Yan-Mei Chen;Qiu-Sheng Gu;Kai Zhang;School of Astronomy and Space Science,Nanjing University;Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University),Ministry of Education;Key Laboratory for Research in Galaxies and Cosmology,Shanghai Astronomical Observatory,Chinese Academy of Sciences;;The broad wing of the [O Ⅲ] λ5007 emission line in active galactic nuclei[J];天文和天体物理学研究(英文版);2014-08
4 FANG Guan-wen;MA Zhong-yang;CHEN Yang;KONG Xu;Institute for Astronomy and History of Science and Technology, Dali University;Key Laboratory for Research in Galaxies and Cosmology, Chinese Academy of Sciences;Center for Astrophysics, University of Science and Technology of China;;The Star-forming Evolution of Galaxies with Redshift in the COSMOS Field[J];Acta Astronomica Sinica;2015-01
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