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The Origins of UV-optical Color Gradients in Star-forming Galaxies at z similar to 2: Predominant Dust Gradients but Negligible sSFR Gradients
Liu, F. S.1,2,3; Jiang, Dongfei1,4; Faber, S. M.2,3; Koo, David C.2,3; Yesuf, Hassen M.2,3; Tacchella, Sandro5; Mao, Shude6,7,8,9; Wang, Weichen10; Guo, Yicheng2,3; Fang, Jerome J.2,3,11; Barro, Guillermo2,3; Zheng, Xianzhong4,12; Jia, Meng1; Tong, Wei1; Liu, Lu1; Meng, Xianmin8
2017-07-20
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume844Issue:1Pages:8
Abstract

The rest-frame UV-optical (i.e., NUV - B) color is sensitive to both low-level recent star formation (specific star formation rate-sSFR) and dust. In this Letter, we extend our previous work on the origins of NUV - B color gradients in star-forming galaxies (SFGs) at z similar to 1 to those at z similar to 2. We use a sample of 1335 large (semimajor axis radius R-SMA > 0.'' 18) SFGs with extended UV emission out to 2R(SMA) in the mass range M-* = 10(9)-10(11) M-circle dot at 1.5 < z < 2.8 in the CANDELS/GOODS-S and UDS fields. We show that these SFGs generally have negative NUV - B color gradients (redder centers), and their color gradients strongly increase with galaxy mass. We also show that the global rest-frame FUV - NUV color is approximately linear with A(V), which is derived by modeling the observed integrated FUV to NIR spectral energy distributions of the galaxies. Applying this integrated calibration to our spatially resolved data, we find a negative dust gradient (more dust extinguished in the centers), which steadily becomes steeper with galaxy mass. We further find that the NUV - B color gradients become nearly zero after correcting for dust gradients regardless of galaxy mass. This indicates that the sSFR gradients are negligible and dust reddening is likely the principal cause of negative UV-optical color gradients in these SFGs. Our findings support that the buildup of the stellar mass in SFGs at Cosmic Noon is self-similar inside 2R(SMA).

Keywordgalaxies: high-redshift galaxies: photometry galaxies: star formation
DOI10.3847/2041-8213/aa7cf5
WOS KeywordEXTRAGALACTIC LEGACY SURVEY ; INSIDE-OUT GROWTH ; MILKY-WAY-LIKE ; LESS-THAN 1.5 ; H-ALPHA MAPS ; STELLAR MASS ; DENSITY PROFILES ; CANDELS ; PROGENITORS ; EVOLUTION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000405607900002
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22899
Collection中国科学院紫金山天文台
Corresponding AuthorLiu, F. S.
Affiliation1.Shenyang Normal Univ, Coll Phys Sci & Technol, Shenyang 110034, Peoples R China
2.Univ Calif Santa Cruz, 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, Peoples R China
5.ETH, Inst Astron, Dept Phys, CH-8093 Zurich, Switzerland
6.Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China
7.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China
8.Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100012, Peoples R China
9.Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Oxford Rd, Manchester M13 9PL, Lancs, England
10.Johns Hopkins Univ, Dept Phys & Astron, 3400 N Charles St, Baltimore, MD 21218 USA
11.Orange Coast Coll, Costa Mesa, CA 92626 USA
12.Chinese Acad Sci, South Amer Ctr Astron, China Chile Joint Ctr Astron, Camino el Observ 1515, Santiago, Chile
Recommended Citation
GB/T 7714
Liu, F. S.,Jiang, Dongfei,Faber, S. M.,et al. The Origins of UV-optical Color Gradients in Star-forming Galaxies at z similar to 2: Predominant Dust Gradients but Negligible sSFR Gradients[J]. ASTROPHYSICAL JOURNAL LETTERS,2017,844(1):8.
APA Liu, F. S..,Jiang, Dongfei.,Faber, S. M..,Koo, David C..,Yesuf, Hassen M..,...&Meng, Xianmin.(2017).The Origins of UV-optical Color Gradients in Star-forming Galaxies at z similar to 2: Predominant Dust Gradients but Negligible sSFR Gradients.ASTROPHYSICAL JOURNAL LETTERS,844(1),8.
MLA Liu, F. S.,et al."The Origins of UV-optical Color Gradients in Star-forming Galaxies at z similar to 2: Predominant Dust Gradients but Negligible sSFR Gradients".ASTROPHYSICAL JOURNAL LETTERS 844.1(2017):8.
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