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20 April 2024

» arxiv » 1912.3669

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SCUBA-2 Ultra Deep Imaging Eao Survey (Studies) III: Multi-wavelength properties, luminosity functions and preliminary source catalog of 450-$mu$m-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 Dunlop ; Yu 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 ;
Date:	8 Dec 2019
Abstract:	We construct a SCUBA-2 450-$mu$m map in the COSMOS field that covers an area of 300 arcmin$^{2}$ and reaches a 1$sigma$ noise level of 0.65 mJy in the deepest region. We extract 256 sources detected at 450 $mu$m with signal-to-noise ratio $>$ 4.0 and analyze the physical properties of their multi-wavelength counterparts. We find that most of the sources are at $zlesssim3$, with a median of $z = 1.79^{+0.03}_{-0.15}$. About $35^{+32}_{-25}$% of our sources are classified as starburst galaxies based on their total star-formation rates (SFRs) and stellar masses ($M_{ast}$). By fitting the far-infrared spectral energy distributions, we find that our 450-$mu$m-selected sample has a wide range of dust temperatures (20 K $ lesssim T_{ m d} lesssim$ 60 K), with a median of ${T}_{ m d} = 38.3^{+0.4}_{-0.9}$ K. We do not find a redshift evolution in dust temperature for sources with $L_{ m IR}$ > $10^{12}$ $ m L_odot$ at $z<3$. However, we find a moderate correlation where dust temperature increases with the deviation from the SFR-$M_{ast}$ relation. The increase in dust temperature also correlates with optical morphology, which is consistent with merger-triggered starbursts in sub-millimeter galaxies. Our galaxies do not show the tight IRX-$eta_{ m UV}$ correlation that has been observed in the local Universe. We construct the infrared luminosity functions of our 450-$mu$m sources and measure their comoving SFR densities. The contribution of the $L_{ m IR}$ > $10^{12}$ $ m L_odot$ population to the SFR density rises dramatically from $z$ = 0 to 2 ($propto$ ($1+z$)$^{3.9pm1.1}$) and dominates the total SFR density at $z gtrsim 2$.
Source:	arXiv, 1912.3669
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