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THE UV-OPTICAL COLOR GRADIENTS IN STAR-FORMING GALAXIES AT 0.5 < z < 1.5: ORIGINS AND LINK TO GALAXY ASSEMBLY
Liu, F. S.1,2,3; Jiang, Dongfei1,4; Guo, Yicheng2,3; Koo, David C.2,3; Faber, S. M.2,3; Zheng, Xianzhong4; Yesuf, Hassen M.2,3; Barro, Guillermo2,3,5; Li, Yao1; Li, Dingpeng1; Wang, Weichen6; Mao, Shude6; Fang, Jerome J.2,3,7
2016-05-10
Source PublicationASTROPHYSICAL JOURNAL LETTERS
Volume822Issue:2
AbstractThe 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.
KeywordGalaxies: High-redshift Galaxies: Photometry Galaxies: Star Formation
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.3847/2041-8205/822/2/L25
WOS KeywordSTELLAR POPULATION GRADIENTS ; EXTRAGALACTIC LEGACY SURVEY ; ELLIPTIC GALAXIES ; GOODS-SOUTH ; CANDELS ; MASS ; PHOTOMETRY ; EVOLUTION ; SEQUENCE ; FIELD
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000376173300005
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16225
Collection南极天文中心
Affiliation1.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
Recommended Citation
GB/T 7714
Liu, F. S.,Jiang, Dongfei,Guo, Yicheng,et al. THE UV-OPTICAL COLOR GRADIENTS IN STAR-FORMING GALAXIES AT 0.5 < z < 1.5: ORIGINS AND LINK TO GALAXY ASSEMBLY[J]. ASTROPHYSICAL JOURNAL LETTERS,2016,822(2).
APA Liu, F. S..,Jiang, Dongfei.,Guo, Yicheng.,Koo, David C..,Faber, S. M..,...&Fang, Jerome J..(2016).THE UV-OPTICAL COLOR GRADIENTS IN STAR-FORMING GALAXIES AT 0.5 < z < 1.5: ORIGINS AND LINK TO GALAXY ASSEMBLY.ASTROPHYSICAL JOURNAL LETTERS,822(2).
MLA Liu, F. S.,et al."THE UV-OPTICAL COLOR GRADIENTS IN STAR-FORMING GALAXIES AT 0.5 < z < 1.5: ORIGINS AND LINK TO GALAXY ASSEMBLY".ASTROPHYSICAL JOURNAL LETTERS 822.2(2016).
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