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题名: THE UV-OPTICAL COLOR GRADIENTS IN STAR-FORMING GALAXIES AT 0.5 < z < 1.5: ORIGINS AND LINK TO GALAXY ASSEMBLY
作者: Liu, F. S.1, 2, 3; Jiang, Dongfei1, 4; Guo, Yicheng2, 3; Koo, David C.2, 3; Faber, S. M.2, 3; Zheng XianZhong(郑宪忠)4; Yesuf, Hassen M.2, 3; Barro, Guillermo2, 3, 5; Li, Yao1; Li, Dingpeng1; Wang, Weichen6; Mao, Shude6; Fang, Jerome J.2, 3, 7
刊名: ASTROPHYSICAL JOURNAL LETTERS
出版日期: 2016-05-10
卷号: 822, 期号:2
关键词: galaxies: high-redshift ; galaxies: photometry ; galaxies: star formation
DOI: 10.3847/2041-8205/822/2/L25
文章类型: Article
英文摘要: The rest-frame UV-optical (i.e., NUV - B) color index is sensitive to the low-level recent star formation and dust extinction, but it is insensitive to the metallicity. In this Letter, we have measured the rest-frame NUV - B color gradients in similar to 1400 large (r(e) > 0.'' 18), nearly face-on (b/a > 0.5) main sequence star-forming galaxies (SFGs) between redshift 0.5 and 1.5 in the CANDELS/GOODS-S and UDS fields. With this sample, we study the origin of UV-optical color gradients in the SFGs at z similar to 1 and discuss their link with the buildup of stellar mass. We find that the more massive, centrally compact, and more dust extinguished SFGs tend to have statistically more negative raw color gradients (redder centers) than the less massive, centrally diffuse, and less dusty SFGs. After correcting for dust reddening based on optical-spectral energy distribution fitting, the color gradients in the low-mass (M-* < 10(10) M-circle dot) SFGs generally become quite flat, while most of the high-mass (M-* > 10(10.5) M-circle dot) SFGs still retain shallow negative color gradients. These findings imply that dust reddening is likely the principal cause of negative color gradients in the low-mass SFGs, while both increased central dust reddening and buildup of compact old bulges are likely the origins of negative color gradients in the high-mass SFGs. These findings also imply that at these redshifts the low-mass SFGs buildup their stellar masses in a self-similar way, while the high-mass SFGs grow inside out.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: STELLAR POPULATION GRADIENTS ; EXTRAGALACTIC LEGACY SURVEY ; ELLIPTIC GALAXIES ; GOODS-SOUTH ; CANDELS ; MASS ; PHOTOMETRY ; EVOLUTION ; SEQUENCE ; FIELD
收录类别: SCI
项目资助者: NSF grants of China(11103013 ; 11573017)
语种: 英语
WOS记录号: WOS:000376173300005
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16225
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.Shenyang Normal Univ, Coll Phys Sci & Technol, Shenyang 110034, Peoples R China
2.Univ Calif Observ, Santa Cruz, CA 95064 USA
3.Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA
4.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
5.Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
6.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
7.Orange Coast Coll, Costa Mesa, CA 92626 USA
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