The Isophotal Structure of Star-forming Galaxies at 0.5 < z < 1.8 in CANDELS: Implications for the Evolution of Galaxy Structure
Jiang,Dongfei1,2; Liu,F. S.1,3; Zheng,Xianzhong2,4; Yesuf,Hassen M.3; Koo,David C.3; Faber,S. M.3; Guo,Yicheng3; Koekemoer,Anton M.5; Wang,Weichen6; Fang,Jerome J.3,7; Barro,Guillermo3,8; Jia,Meng7; Tong,Wei7; Liu,Lu7; Meng,Xianmin9; Kocevski,Dale10; McGrath,Elizabeth J.10; Hathi,Nimish P.5,11
Source PublicationThe Astrophysical Journal
AbstractAbstract We have measured the radial profiles of isophotal ellipticity (ε) and disky/boxy parameter A4 out to radii of about three times the semimajor axes for ~4600 star-forming galaxies (SFGs) between redshift 0.5 and 1.8 in the CANDELS/GOODS-S and UDS fields. Based on the average size–mass relation in each redshift bin, we divide our galaxies at a given mass into Small SFGs (SSFGs; smaller than the average) and Large SFGs (LSFGs; larger than the average). We show that, at low masses ( ), the SSFGs generally have nearly flat ε and A4 profiles in both edge-on and face-on views, especially at . Moreover, the median A4 values at all radii are almost zero. In contrast, the highly inclined low-mass LSFGs in the same mass-redshift bins generally have monotonically increasing ε profiles with radius and disky feature dominated in the intermediate regions. These findings imply that at these redshifts, the low-mass SSFGs are not disk-like, whereas the low-mass LSFGs likely harbour disk-like components flattened by significant rotations. At high masses ( ), both highly inclined SSFGs and LSFGs generally exhibit distinct trends in both ε and A4 profiles, which increase at lower radii, reach maxima, then decrease at larger radii. Such the feature is more prevalent for more massive ( ) galaxies or at lower redshifts ( ). This feature can be simply explained if galaxies possess all three components: central bulges, disks in the intermediate regions, and halo-like stellar components in the outskirts.
Keywordgalaxies: high-redshift galaxies: photometry galaxies: star formation
WOS IDIOP:0004-637X-854-1-aaa5ad
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.College of Physical Science and Technology, Shenyang Normal University, Shenyang 110034, People's Republic of China;
2.Purple Mountain Observatory, Chinese Academy of Sciences, 2 West-Beijing Road, Nanjing 210008, People's Republic of China
3.University of California Observatories and the Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA
4.Chinese Academy of Sciences South America Center for Astronomy, China-Chile Joint Center for Astronomy, Camino El Observatorio 1515, Las Condes, Santiago, Chile
5.Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
6.Department of Physics & Astronomy, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA
7.Orange Coast College, Costa Mesa, CA 92626, USA
8.Department of Astronomy, University of California, Berkeley, CA 94720-3411, USA
9.National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Beijing 100012, People's Republic of China
10.Department of Physics and Astronomy, Colby College, Mayflower Hill Drive, Waterville, ME 0490, USA
11.Aix Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, F-13388, Marseille, France
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GB/T 7714
Jiang,Dongfei,Liu,F. S.,Zheng,Xianzhong,et al. The Isophotal Structure of Star-forming Galaxies at 0.5 < z < 1.8 in CANDELS: Implications for the Evolution of Galaxy Structure[J]. The Astrophysical Journal,2018,854(1).
APA Jiang,Dongfei.,Liu,F. S..,Zheng,Xianzhong.,Yesuf,Hassen M..,Koo,David C..,...&Hathi,Nimish P..(2018).The Isophotal Structure of Star-forming Galaxies at 0.5 < z < 1.8 in CANDELS: Implications for the Evolution of Galaxy Structure.The Astrophysical Journal,854(1).
MLA Jiang,Dongfei,et al."The Isophotal Structure of Star-forming Galaxies at 0.5 < z < 1.8 in CANDELS: Implications for the Evolution of Galaxy Structure".The Astrophysical Journal 854.1(2018).
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