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        Multi-wavelength properties of radio and machine-learning identified counterparts to submillimeter sources in S2COSMOS

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        Xia_An_2019_ApJ_886_48.pdf (PDF, 2Mb)
        Author
        An, FangXia
        Simpson, J. M.
        Smail, Ian
        Swinbank, A. M.
        Ma, Cong
        Liu, Daizhong
        Lang, P.
        Schinnerer, E.
        Karim, A.
        Magnelli, B.
        Leslie, S.
        Bertoldi, F.
        Chen, Chian-Chou
        Geach, J. E.
        Matsuda, Y.
        Stach, S. M.
        Wardlow, J. L.
        Gullberg, B.
        Ivison, R. J.
        Ao, Y.
        Coogan, R. T.
        Thomson, A. P.
        Chapman, S. C.
        Wang, R.
        Wang, Wei-Hao
        Yang, Y.
        Asquith, R.
        Bourne, N.
        Coppin, K.
        Hine, N. K.
        Ho, L. C.
        Hwang, H. S.
        Kato, Y.
        Lacaille, K.
        Lewis, A. J. R.
        Oteo, I.
        Scholtz, J.
        Sawicki, M.
        Smith, D.
        Attention
        2299/22396
        Abstract
        We identify multi-wavelength counterparts to 1,147 submillimeter sources from the S2COSMOS SCUBA-2 survey of the COSMOS field by employing a recently developed radio$+$machine-learning method trained on a large sample of ALMA-identified submillimeter galaxies (SMGs), including 260 SMGs identified in the AS2COSMOS pilot survey. In total, we identify 1,222 optical/near-infrared(NIR)/radio counterparts to the 897 S2COSMOS submillimeter sources with S$_{850}$>1.6mJy, yielding an overall identification rate of ($78\pm9$)%. We find that ($22\pm5$)% of S2COSMOS sources have multiple identified counterparts. We estimate that roughly 27% of these multiple counterparts within the same SCUBA-2 error circles very likely arise from physically associated galaxies rather than line-of-sight projections by chance. The photometric redshift of our radio$+$machine-learning identified SMGs ranges from z=0.2 to 5.7 and peaks at $z=2.3\pm0.1$. The AGN fraction of our sample is ($19\pm4$)%, which is consistent with that of ALMA SMGs in the literature. Comparing with radio/NIR-detected field galaxy population in the COSMOS field, our radio+machine-learning identified counterparts of SMGs have the highest star-formation rates and stellar masses. These characteristics suggest that our identified counterparts of S2COSMOS sources are a representative sample of SMGs at z
        Publication date
        2019-11-20
        Published in
        The Astrophysical Journal, Volume
        Published version
        https://doi.org/10.3847/1538-4357/ab4d53
        Other links
        http://hdl.handle.net/2299/22396
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