SCUBA-2 Ultra Deep Imaging EAO Survey (Studies). III. Multiwavelength Properties, Luminosity Functions, and Preliminary Source Catalog of 450 μm Selected Galaxies

Lim, Chen-Fatt; Wang, Wei-Hao; Smail, Ian; Scott, Douglas; Chen, Chian-Chou; Chang, Yu-Yen; Simpson, James M.; Toba, Yoshiki; Shu, Xinwen; Clements, Dave; Greenslade, Josh; Ao, YiPing; Babul, Arif; Birkin, Jack; Chapman, Scott C.; Cheng, Tai-An; Cho, Brian S.; Dannerbauer, Helmut; Dudzevičiūtė, Ugnė; Dunlop, James; Gao, Yu; Goto, Tomotsugu; Ho, Luis C.; Hsu, Li-Ting; Hwang, Ho Seong; Jeong, Woong-Seob; Koprowski, Maciej; Lee, Chien-Hsiu; Lin, Ming-Yi; Lin, Wei-Ching; Michałowski, Michał J.; Parsons, Harriet; Sawicki, Marcin; Shirley, Raphael; Shim, Hyunjin; Urquhart, Sheona; Wang, Jianfa; Wang, Tao

doi:10.3847/1538-4357/ab607f

SCUBA-2 Ultra Deep Imaging EAO Survey (Studies). III. Multiwavelength Properties, Luminosity Functions, and Preliminary Source Catalog of 450 μm Selected Galaxies

Lim, Chen-Fatt; Wang, Wei-Hao; Smail, Ian; Scott, Douglas; Chen, Chian-Chou; Chang, Yu-Yen; Simpson, James M.; Toba, Yoshiki; Shu, Xinwen; Clements, Dave; Greenslade, Josh; Ao, YiPing; Babul, Arif; Birkin, Jack; Chapman, Scott C.; Cheng, Tai-An; Cho, Brian S.; Dannerbauer, Helmut; Dudzevičiūtė, Ugnė; Dunlop, James; Gao, Yu; Goto, Tomotsugu; Ho, Luis C.; Hsu, Li-Ting; Hwang, Ho Seong; Jeong, Woong-Seob; Koprowski, Maciej; Lee, Chien-Hsiu; Lin, Ming-Yi; Lin, Wei-Ching; Michałowski, Michał J.; Parsons, Harriet; Sawicki, Marcin; Shirley, Raphael; Shim, Hyunjin; Urquhart, Sheona; Wang, Jianfa; Wang, Tao

Authors

Chen-Fatt Lim

Wei-Hao Wang

Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor

Douglas Scott

Chian-Chou Chen

Yu-Yen Chang

James M. Simpson

Yoshiki Toba

Xinwen Shu

Dave Clements

Josh Greenslade

YiPing Ao

Arif Babul

Jack Birkin jack.birkin@durham.ac.uk
PGR Student Doctor of Philosophy

Scott C. Chapman

Tai-An Cheng

Brian S. Cho

Helmut Dannerbauer

Ugne Dudzeviciute ugne.dudzeviciute2@durham.ac.uk
PGR Student Doctor of Philosophy

James Dunlop

Yu Gao

Tomotsugu Goto

Luis C. Ho

Li-Ting Hsu

Ho Seong Hwang

Woong-Seob Jeong

Maciej Koprowski

Chien-Hsiu Lee

Ming-Yi Lin

Wei-Ching Lin

Michał J. Michałowski

Harriet Parsons

Marcin Sawicki

Raphael Shirley

Hyunjin Shim

Sheona Urquhart

Jianfa Wang

Tao Wang

Abstract

We construct a SCUBA-2 450 μm map in the COSMOS field that covers an area of 300 arcmin2 and reaches a 1σ noise level of 0.65 mJy in the deepest region. We extract 256 sources detected at 450 μm with signal-to-noise ratios >4.0 and analyze the physical properties of their multiwavelength counterparts. We find that most of the sources are at z lesssim 3, with a median of $z={1.79}_{-0.15}^{+0.03} \% $. About ${35}_{-25}^{+32} \% $ of our sources are classified as starburst galaxies based on their total star formation rates (SFRs) and stellar masses (M *). By fitting the far-infrared spectral energy distributions, we find that our 450 μm selected sample has a wide range of dust temperatures (20 K lesssim T d lesssim 60 K), with a median of ${T}_{{\rm{d}}}={38.3}_{-0.9}^{+0.4}$ K. We do not find a redshift evolution in dust temperature for sources with ${L}_{\mathrm{IR}}\gt {10}^{12}\,{L}_{\odot }$ at z < 3. However, we find a moderate correlation where the dust temperature increases with the deviation from the SFR–M * relation. The increase in dust temperature also correlates with optical morphology, which is consistent with merger-triggered starbursts in submillimeter galaxies. Our galaxies do not show the tight IRX–β UV correlation that has been observed in the local universe. We construct the infrared luminosity functions of our 450 μm sources and measure their comoving SFR densities (SFRDs). The contribution of the ${L}_{\mathrm{IR}}\gt {10}^{12}\,{L}_{\odot }$ population to the SFRD rises dramatically from z = 0 to 2 (∝(1 + z)3.9±1.1) and dominates the total SFRD at z gsim 2.

Citation

Lim, C., Wang, W., Smail, I., Scott, D., Chen, C., Chang, Y., …Wang, T. (2020). SCUBA-2 Ultra Deep Imaging EAO Survey (Studies). III. Multiwavelength Properties, Luminosity Functions, and Preliminary Source Catalog of 450 μm Selected Galaxies. Astrophysical Journal, 889(2), Article 80. https://doi.org/10.3847/1538-4357/ab607f

Journal Article Type	Article
Acceptance Date	Dec 6, 2019
Online Publication Date	Jan 28, 2020
Publication Date	Feb 1, 2020
Deposit Date	Mar 25, 2020
Publicly Available Date	Mar 25, 2020
Journal	Astrophysical Journal
Print ISSN	0004-637X
Publisher	American Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	889
Issue	2
Article Number	80
DOI	https://doi.org/10.3847/1538-4357/ab607f