SCUBA-2 ultra deep imaging EAO survey (studies). III. multiwavelength properties, luminosity functions, and preliminary source catalog of 450 mu m selected galaxies
OA Location
Author(s)
Type
Journal Article
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.
Date Issued
2020-02-01
Date Acceptance
2019-12-06
Citation
The Astrophysical Journal: an international review of astronomy and astronomical physics, 2020, 889 (2), pp.1-33
ISSN
0004-637X
Publisher
American Astronomical Society
Start Page
1
End Page
33
Journal / Book Title
The Astrophysical Journal: an international review of astronomy and astronomical physics
Volume
889
Issue
2
Copyright Statement
© 2020. The American Astronomical Society. All rights reserved. All rights reserved. This is an author-created, un-copyedited version of an article accepted for publication in Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at https://doi.org/10.3847/1538-4357/ab8eaf.
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000520965400001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Astronomy & Astrophysics
High-redshift galaxies
Galaxy evolution
Luminosity function
Submillimeter astronomy
COSMOLOGY LEGACY SURVEY
STAR-FORMING GALAXIES
SIMILAR-TO 2
DEGREE EXTRAGALACTIC SURVEY
ACTIVE GALACTIC NUCLEI
FORMATION RATE DENSITY
SPECTRAL ENERGY-DISTRIBUTIONS
AZTEC MILLIMETER SURVEY
SUBMILLIMETER GALAXIES
HIGH-REDSHIFT
Publication Status
Published
Article Number
ARTN 80
Date Publish Online
2020-01-28