We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.

Durham Research Online
You are in:
• Home
• Research
• Durham Research Online
• SCUBA-2 Ultra Deep Imaging EAO Survey (Studies). III. Multiwavelength properties, luminosity functions, and preliminary source catalog of 450 μm selected galaxies.

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 and Wang, Wei-Hao and Smail, Ian and Scott, Douglas and Chen, Chian-Chou and Chang, Yu-Yen and Simpson, James M. and Toba, Yoshiki and Shu, Xinwen and Clements, Dave and Greenslade, Josh and Ao, YiPing and Babul, Arif and Birkin, Jack and Chapman, Scott C. and Cheng, Tai-An and Cho, Brian S. and Dannerbauer, Helmut and Dudzevičiūtė, Ugnė and Dunlop, James and Gao, Yu and Goto, Tomotsugu and Ho, Luis C. and Hsu, Li-Ting and Hwang, Ho Seong and Jeong, Woong-Seob and Koprowski, Maciej and Lee, Chien-Hsiu and Lin, Ming-Yi and Lin, Wei-Ching and Michałowski, Michał J. and Parsons, Harriet and Sawicki, Marcin and Shirley, Raphael and Shim, Hyunjin and Urquhart, Sheona and Wang, Jianfa and Wang, Tao (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). p. 80.

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.