Yu-Yen Chang
SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES). II. Structural Properties and Near-infrared Morphologies of Faint Submillimeter Galaxies
Chang, Yu-Yen; Ferraro, Nicholas; Wang, Wei-Hao; Lim, Chen-Fatt; Toba, Yoshiki; An, Fangxia; Chen, Chian-Chou; Smail, Ian; Shim, Hyunjin; Ao, Yiping; Bunker, Andy; Conselice, Christopher J.; Cowley, William; da Cunha, Elisabete; Fan, Lulu; Goto, Tomotsugu; Guo, Kexin; Ho, Luis C.; Hwang, Ho Seong; Lee, Chien-Hsiu; Lee, Minju; Michałowski, Michał J.; Oteo, I.; Scott, Douglas; Serjeant, Stephen; Shu, Xinwen; Simpson, James; Urquhart, Sheona
Authors
Nicholas Ferraro
Wei-Hao Wang
Chen-Fatt Lim
Yoshiki Toba
Fangxia An
Chian-Chou Chen
Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
Hyunjin Shim
Yiping Ao
Andy Bunker
Christopher J. Conselice
William Cowley
Elisabete da Cunha
Lulu Fan
Tomotsugu Goto
Kexin Guo
Luis C. Ho
Ho Seong Hwang
Chien-Hsiu Lee
Minju Lee
Michał J. Michałowski
I. Oteo
Douglas Scott
Stephen Serjeant
Xinwen Shu
James Simpson
Sheona Urquhart
Abstract
We present structural parameters and morphological properties of faint 450 μm selected submillimeter galaxies (SMGs) from the JCMT Large Program, STUDIES, in the COSMOS-CANDELS region. Their properties are compared to an 850 μm selected and a matched star-forming samples. We investigate stellar structures of 169 faint 450 μm sources (S 450 = 2.8–29.6 mJy; S/N > 4) at z < 3 using HST near-infrared observations. Based on our spectral energy distribution fitting, half of such faint SMGs (L IR = 1011.65±0.98 L ⊙) lie above the star formation rate (SFR)/stellar mass plane. The size–mass relation shows that these SMGs are generally similar to less-luminous star-forming galaxies selected by NUV − r versus r − J colors. Because of the intrinsic luminosity of the sample, their rest-frame optical emission is less extended than the 850 μm sources (S 850 > 2 mJy) and more extended than the star-forming galaxies in the same redshift range. For the stellar mass and SFR-matched sample at z sime 1 and z sime 2, the size differences are marginal between faint SMGs and the matched galaxies. Moreover, faint SMGs have similar Sérsic indices and projected axis ratios as star-forming galaxies with the same stellar mass and SFR. Both SMGs and the matched galaxies show high fractions (~70%) of disturbed features at z sime 2, and the fractions depend on the SFRs. These suggest that their star formation activity is related to galaxy merging and the stellar structures of SMGs are similar to those of star-forming galaxies. We show that the depths of submillimeter surveys are approaching the lower luminosity end of star-forming galaxies, allowing us to detect galaxies on the main sequence.
Citation
Chang, Y., Ferraro, N., Wang, W., Lim, C., Toba, Y., An, F., …Urquhart, S. (2018). SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES). II. Structural Properties and Near-infrared Morphologies of Faint Submillimeter Galaxies. Astrophysical Journal, 865(2), Article 103. https://doi.org/10.3847/1538-4357/aadd18
Journal Article Type | Article |
---|---|
Acceptance Date | Aug 20, 2018 |
Online Publication Date | Sep 27, 2018 |
Publication Date | Sep 27, 2018 |
Deposit Date | Oct 12, 2018 |
Publicly Available Date | Oct 12, 2018 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 865 |
Issue | 2 |
Article Number | 103 |
DOI | https://doi.org/10.3847/1538-4357/aadd18 |
Public URL | https://durham-repository.worktribe.com/output/1345700 |
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