DOI | Resolve DOI: https://doi.org/10.3847/1538-4357/ab607f |
---|
Author | Search for: Lim, Chen-FattORCID identifier: https://orcid.org/0000-0003-1213-9360; Search for: Wang, Wei-HaoORCID identifier: https://orcid.org/0000-0003-2588-1265; Search for: Smail, IanORCID identifier: https://orcid.org/0000-0003-3037-257X; Search for: Scott, DouglasORCID identifier: https://orcid.org/0000-0002-6878-9840; Search for: Chen, Chian-ChouORCID identifier: https://orcid.org/0000-0002-3805-0789; Search for: Chang, Yu-Yen; Search for: Simpson, James M.ORCID identifier: https://orcid.org/0000-0002-8521-1995; Search for: Toba, YoshikiORCID identifier: https://orcid.org/0000-0002-3531-7863; Search for: Shu, Xinwen; Search for: Clements, DaveORCID identifier: https://orcid.org/0000-0002-9548-5033; Search for: Greenslade, Josh; Search for: Ao, YipingORCID identifier: https://orcid.org/0000-0003-3139-2724; Search for: Babul, ArifORCID identifier: https://orcid.org/0000-0003-1746-9529; Search for: Birkin, JackORCID identifier: https://orcid.org/0000-0002-3272-7568; Search for: Chapman, Scott C.1; Search for: Cheng, Tai-An; Search for: Cho, Brian S.; Search for: Dannerbauer, HelmutORCID identifier: https://orcid.org/0000-0001-7147-3575; Search for: Dudzevičiūtė, UgnėORCID identifier: https://orcid.org/0000-0003-4748-0681; Search for: Dunlop, James; Search for: Gao, YuORCID identifier: https://orcid.org/0000-0003-0007-2197; Search for: Goto, Tomotsugu; Search for: Ho, Luis C.ORCID identifier: https://orcid.org/0000-0001-6947-5846; Search for: Hsu, Li-TingORCID identifier: https://orcid.org/0000-0002-3538-8987; Search for: Hwang, Ho SeongORCID identifier: https://orcid.org/0000-0003-3428-7612; Search for: Jeong, Woong-SeobORCID identifier: https://orcid.org/0000-0002-2770-808X; Search for: Koprowski, MaciejORCID identifier: https://orcid.org/0000-0001-5785-1154; Search for: Lee, Chien-HsiuORCID identifier: https://orcid.org/0000-0003-1700-5740; Search for: Lin, Ming-Yi; Search for: Lin, Wei-Ching; Search for: Michałowski, Michał J.ORCID identifier: https://orcid.org/0000-0001-9033-4140; Search for: Parsons, HarrietORCID identifier: https://orcid.org/0000-0002-6327-3423; Search for: Sawicki, Marcin; Search for: Shirley, Raphael; Search for: Shim, Hyunjin; Search for: Urquhart, Sheona; Search for: Wang, Jianfa; Search for: Wang, TaoORCID identifier: https://orcid.org/0000-0002-2504-2421 |
---|
Affiliation | - National Research Council of Canada. Herzberg Astronomy and Astrophysics
|
---|
Format | Text, Article |
---|
Subject | high-redshift galaxies; galaxy evolution; luminosity function; submillimeter astronomy |
---|
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 ≲ 3, with a median of z=1.79⁺⁰.⁰³₋₁.₅%. About 35⁺³²₋₂₅% 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 ≲ T d ≲ 60 K), with a median of Td=38.3⁺⁰.⁴₋₀.₉ K. We do not find a redshift evolution in dust temperature for sources with LIR > 10¹² >L⊙ 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 LIR > 10¹²L⊙ 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. |
---|
Publication date | 2020-01-28 |
---|
Publisher | IOP |
---|
In | |
---|
Language | English |
---|
Peer reviewed | Yes |
---|
Export citation | Export as RIS |
---|
Report a correction | Report a correction (opens in a new tab) |
---|
Record identifier | ddee847d-550d-4038-9211-34d8d280ae91 |
---|
Record created | 2020-11-05 |
---|
Record modified | 2021-09-17 |
---|