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

Chen-Fatt Lim*, Wei-Hao Wang, Ian Smail, 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, Scott C. Chapman, Tai-An Cheng, Brian S. Cho, Helmut Dannerbauer, Ugnė Dudzevičiūtė, James DunlopYu 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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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  3, with a median of . About 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 Td 60 K), with a median of K. We do not find a redshift evolution in dust temperature for sources with 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–βUV 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 population to the SFRD rises dramatically from z = 0 to 2 (∝(1 + z)3.9±1.1) and dominates the total SFRD at z  2.
Original languageEnglish
Article number80
Pages (from-to)1-33
Number of pages33
JournalAstrophysical Journal
Volume889
Issue number2
DOIs
Publication statusPublished - 28 Jan 2020

Keywords / Materials (for Non-textual outputs)

  • astro-ph.GA

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