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; Minju Lee; Michal J. Michalowski; I. Oteo; Douglas Scott; Stephen Serjeant; Xinwen Shu; James Simpson; Sheona Urquhart

doi:10.3847/1538-4357/aadd18

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 LeeMinju Lee, Michal J. Michalowski, I. Oteo, Douglas Scott, Stephen Serjeant, Xinwen Shu, James Simpson, Sheona Urquhart

^*Corresponding author for this work

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Abstract

We present structural parameters and morphological properties of faint 450 mu m selected submillimeter galaxies (SMGs) from the JCMT Large Program, STUDIES, in the COSMOS-CANDELS region. Their properties are compared to an 850 mu m selected and a matched star-forming samples. We investigate stellar structures of 169 faint 450 mu m 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 = 10(11.65 +/- 0.98) L-circle dot) 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 mu m 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 similar or equal to 1 and z similar or equal to 2, the size differences are marginal between faint SMGs and the matched galaxies. Moreover, faint SMGs have similar Sersic 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 (similar to 70%) of disturbed features at z similar or equal to 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 language	English
Article number	103
Number of pages	16
Journal	Astrophysical Journal
Volume	865
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/aadd18
Publication status	Published - 1-Oct-2018

Keywords

galaxies: evolution
galaxies: high-redshift
galaxies: star formation
galaxies: structure
submillimeter: galaxies
STAR-FORMING GALAXIES
COSMOLOGY LEGACY SURVEY
HUBBLE-SPACE-TELESCOPE
CLERK MAXWELL TELESCOPE
HIGH-REDSHIFT
MU-M
MASSIVE GALAXIES
QUIESCENT GALAXIES
NUMBER COUNTS
MAIN-SEQUENCE

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STUDIES. II. NIR morphologies of submm galaxies
Chang, Y.-Y. (Contributor), Ferraro, N. (Contributor), Wang, W.-H. (Contributor), Lim, C.-F. (Contributor), Toba, Y. (Contributor), An, F. (Contributor), Chen, C.-C. (Contributor), Smail, I. (Contributor), Shim, H. (Contributor), Ao, Y. (Contributor), Bunker, A. (Contributor), Conselice, C. J. (Contributor), Cowley, W. (Contributor), Da Cunha, E. (Contributor), Fan, L. (Contributor), Goto, T. (Contributor), Guo, K. (Contributor), Ho, L. C. (Contributor), Hwang, H. S. (Contributor), Lee, C.-H. (Contributor), Lee, M. (Contributor), Michałowski, M. J. (Contributor), Oteo, I. (Contributor), Scott, D. (Contributor), Serjeant, S. (Contributor), Shu, X. (Contributor), Simpson, J. (Contributor) & Urquhart, S. (Contributor), University of Groningen, 1-Oct-2018
DOI: 10.26093/cds/vizier.18650103
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Chang, Y.-Y., Ferraro, N., Wang, W.-H., Lim, C.-F., Toba, Y., An, F., Chen, C.-C., Smail, I., Shim, H., Ao, Y., Bunker, A., Conselice, C. J., Cowley, W., da Cunha, E., Fan, L., Goto, T., Guo, K., Ho, L. C., Hwang, H. S., ... 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

@article{46d29bf03e9f43a48800d4c96a60bbb9,

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 mu m selected submillimeter galaxies (SMGs) from the JCMT Large Program, STUDIES, in the COSMOS-CANDELS region. Their properties are compared to an 850 mu m selected and a matched star-forming samples. We investigate stellar structures of 169 faint 450 mu m 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 = 10(11.65 +/- 0.98) L-circle dot) 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 mu m 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 similar or equal to 1 and z similar or equal to 2, the size differences are marginal between faint SMGs and the matched galaxies. Moreover, faint SMGs have similar Sersic 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 (similar to 70%) of disturbed features at z similar or equal to 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, STAR-FORMING GALAXIES, COSMOLOGY LEGACY SURVEY, HUBBLE-SPACE-TELESCOPE, CLERK MAXWELL TELESCOPE, HIGH-REDSHIFT, MU-M, MASSIVE GALAXIES, QUIESCENT GALAXIES, NUMBER COUNTS, MAIN-SEQUENCE",

author = "Yu-Yen Chang and Nicholas Ferraro and Wei-Hao Wang and Chen-Fatt Lim and Yoshiki Toba and Fangxia An and Chian-Chou Chen 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 Chien-Hsiu Lee and Minju Lee and Michalowski, {Michal J.} and I. Oteo and Douglas Scott and Stephen Serjeant and Xinwen Shu and James Simpson and Sheona Urquhart",

year = "2018",

month = oct,

day = "1",

doi = "10.3847/1538-4357/aadd18",

language = "English",

volume = "865",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP PUBLISHING LTD",

number = "2",

}

Chang, Y-Y, Ferraro, N, Wang, W-H, Lim, C-F, Toba, Y, An, F, Chen, C-C, 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, C-H, Lee, M, Michalowski, 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

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 - Michalowski, Michal 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 mu m selected submillimeter galaxies (SMGs) from the JCMT Large Program, STUDIES, in the COSMOS-CANDELS region. Their properties are compared to an 850 mu m selected and a matched star-forming samples. We investigate stellar structures of 169 faint 450 mu m 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 = 10(11.65 +/- 0.98) L-circle dot) 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 mu m 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 similar or equal to 1 and z similar or equal to 2, the size differences are marginal between faint SMGs and the matched galaxies. Moreover, faint SMGs have similar Sersic 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 (similar to 70%) of disturbed features at z similar or equal to 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 mu m selected submillimeter galaxies (SMGs) from the JCMT Large Program, STUDIES, in the COSMOS-CANDELS region. Their properties are compared to an 850 mu m selected and a matched star-forming samples. We investigate stellar structures of 169 faint 450 mu m 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 = 10(11.65 +/- 0.98) L-circle dot) 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 mu m 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 similar or equal to 1 and z similar or equal to 2, the size differences are marginal between faint SMGs and the matched galaxies. Moreover, faint SMGs have similar Sersic 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 (similar to 70%) of disturbed features at z similar or equal to 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

KW - STAR-FORMING GALAXIES

KW - COSMOLOGY LEGACY SURVEY

KW - HUBBLE-SPACE-TELESCOPE

KW - CLERK MAXWELL TELESCOPE

KW - HIGH-REDSHIFT

KW - MU-M

KW - MASSIVE GALAXIES

KW - QUIESCENT GALAXIES

KW - NUMBER COUNTS

KW - MAIN-SEQUENCE

U2 - 10.3847/1538-4357/aadd18

DO - 10.3847/1538-4357/aadd18

M3 - Article

SN - 0004-637X

VL - 865

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 103

ER -

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

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Keywords

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STUDIES. II. NIR morphologies of submm galaxies

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