SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES). II. Structural Properties and Near-infrared Morphologies of Faint Submillimeter Galaxies

Yu Yen Chang, Nicholas Ferraro, Wei Hao Wang, Chen Fatt Lim, Yoshiki Toba, Fangxia An, Chian Chou Chen, Ian Smail, 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 & 8 others Minju Lee, Michał J. Michałowski, I. Oteo, Douglas Scott, Stephen Serjeant, Xinwen Shu, James Simpson, Sheona Urquhart

Research output: Contribution to journalReview article

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 o) 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 ≃ 1 and z ≃ 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 ≃ 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.

Original languageEnglish
Article number103
JournalAstrophysical Journal
Volume865
Issue number2
DOIs
Publication statusPublished - 1 Oct 2018

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near infrared
galaxies
stars
stellar structure
stellar mass
COSMOS
index
luminosity
parameter
programme
star formation

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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. / SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES). II. Structural Properties and Near-infrared Morphologies of Faint Submillimeter Galaxies. In: Astrophysical Journal. 2018 ; Vol. 865, No. 2.
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title = "SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES). II. Structural Properties and Near-infrared Morphologies of Faint Submillimeter Galaxies",
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 o) 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 ≃ 1 and z ≃ 2, the size differences are marginal between faint SMGs and the matched galaxies. Moreover, faint SMGs have similar S{\'e}rsic 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 ≃ 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.",
keywords = "galaxies: evolution, galaxies: high-redshift, galaxies: star formation, galaxies: structure, submillimeter: galaxies",
author = "Chang, {Yu Yen} and Nicholas Ferraro and Wang, {Wei Hao} and Lim, {Chen Fatt} and Yoshiki Toba and Fangxia An and Chen, {Chian Chou} and Ian Smail and Hyunjin Shim and Yiping Ao and Andy Bunker and Conselice, {Christopher J.} and William Cowley and {Da Cunha}, Elisabete and Lulu Fan and Tomotsugu Goto and Kexin Guo and Ho, {Luis C.} and Hwang, {Ho Seong} and Lee, {Chien Hsiu} and Minju Lee and Michałowski, {Michał J.} and I. Oteo and Douglas Scott and Stephen Serjeant and Xinwen Shu and James Simpson and Sheona Urquhart",
year = "2018",
month = "10",
day = "1",
doi = "10.3847/1538-4357/aadd18",
language = "English",
volume = "865",
journal = "The Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing",
number = "2",

}

Chang, YY, Ferraro, N, Wang, WH, Lim, CF, Toba, Y, An, F, Chen, CC, Smail, I, Shim, H, Ao, Y, Bunker, A, Conselice, CJ, Cowley, W, Da Cunha, E, Fan, L, Goto, T, Guo, K, Ho, LC, Hwang, HS, Lee, CH, Lee, M, Michałowski, MJ, Oteo, I, Scott, D, Serjeant, S, Shu, X, Simpson, J & Urquhart, S 2018, 'SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES). II. Structural Properties and Near-infrared Morphologies of Faint Submillimeter Galaxies' Astrophysical Journal, vol. 865, no. 2, 103. https://doi.org/10.3847/1538-4357/aadd18

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.

In: Astrophysical Journal, Vol. 865, No. 2, 103, 01.10.2018.

Research output: Contribution to journalReview article

TY - JOUR

T1 - SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES). II. Structural Properties and Near-infrared Morphologies of Faint Submillimeter Galaxies

AU - Chang, Yu Yen

AU - Ferraro, Nicholas

AU - Wang, Wei Hao

AU - Lim, Chen Fatt

AU - Toba, Yoshiki

AU - An, Fangxia

AU - Chen, Chian Chou

AU - Smail, Ian

AU - Shim, Hyunjin

AU - Ao, Yiping

AU - Bunker, Andy

AU - Conselice, Christopher J.

AU - Cowley, William

AU - Da Cunha, Elisabete

AU - Fan, Lulu

AU - Goto, Tomotsugu

AU - Guo, Kexin

AU - Ho, Luis C.

AU - Hwang, Ho Seong

AU - Lee, Chien Hsiu

AU - Lee, Minju

AU - Michałowski, Michał J.

AU - Oteo, I.

AU - Scott, Douglas

AU - Serjeant, Stephen

AU - Shu, Xinwen

AU - Simpson, James

AU - Urquhart, Sheona

PY - 2018/10/1

Y1 - 2018/10/1

N2 - 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 o) 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 ≃ 1 and z ≃ 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 ≃ 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.

AB - 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 o) 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 ≃ 1 and z ≃ 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 ≃ 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.

KW - galaxies: evolution

KW - galaxies: high-redshift

KW - galaxies: star formation

KW - galaxies: structure

KW - submillimeter: galaxies

UR - http://www.scopus.com/inward/record.url?scp=85054874385&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/aadd18

DO - 10.3847/1538-4357/aadd18

M3 - Review article

VL - 865

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 103

ER -