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SCUBA-2 Ultra Deep Imaging EAO Survey (Studies). III. Multiwavelength properties, luminosity functions, and preliminary source catalog of 450 μm selected galaxies

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.3847/1538-4357/ab607f
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Affiliation
  1. National Research Council of Canada. Herzberg Astronomy and Astrophysics
FormatText, Article
Subjecthigh-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
PublisherIOP
In
  • The Astrophysical Journal 889, no. 2.
LanguageEnglish
Peer reviewedYes
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Record identifierddee847d-550d-4038-9211-34d8d280ae91
Record created2020-11-05
Record modified2021-09-17
Date modified: