An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: identifying candidate z∼4.5[CII] emitters
We report the results of a search for serendipitous [C ii] 157.74 μm emitters at z sime 4.4–4.7 using the Atacama Large Millimeter/submillimeter Array (ALMA). The search exploits the AS2UDS continuum survey, which covers ~50 arcmin2 of the sky toward 695 luminous (S 870 gsim 1 mJy) submillimeter gal...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
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American Astronomical Society
2018
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| Online Access: | https://eprints.nottingham.ac.uk/53120/ |
| _version_ | 1848798883015032832 |
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| author | Cooke, E.A. Smail, Ian Swinbank, A.M. Stach, S.M. An, Fang Xia Gullberg, B. Almaini, O. Simpson, C.J. Wardlow, J.L. Blain, A.W. Chapman, S.C. Chen, Chian-Chou Conselice, C.J. Coppin, K.E.K. Farrah, D. Maltby, D.T. Michałowski, M.J. Scott, D. Simpson, J.M. Thomson, A.P. Werf, P. van der |
| author_facet | Cooke, E.A. Smail, Ian Swinbank, A.M. Stach, S.M. An, Fang Xia Gullberg, B. Almaini, O. Simpson, C.J. Wardlow, J.L. Blain, A.W. Chapman, S.C. Chen, Chian-Chou Conselice, C.J. Coppin, K.E.K. Farrah, D. Maltby, D.T. Michałowski, M.J. Scott, D. Simpson, J.M. Thomson, A.P. Werf, P. van der |
| author_sort | Cooke, E.A. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | We report the results of a search for serendipitous [C ii] 157.74 μm emitters at z sime 4.4–4.7 using the Atacama Large Millimeter/submillimeter Array (ALMA). The search exploits the AS2UDS continuum survey, which covers ~50 arcmin2 of the sky toward 695 luminous (S 870 gsim 1 mJy) submillimeter galaxies (SMGs), selected from the SCUBA-2 Cosmology Legacy Survey 0.96 deg2 Ultra Deep Survey (UDS) field. We detect 10 candidate line emitters, with an expected false detection rate of 10%. All of these line emitters correspond to 870 μm continuum-detected sources in AS2UDS. The emission lines in two emitters appear to be high-J CO, but the remainder have multi-wavelength properties consistent with [C ii] from z sime 4.5 galaxies. Using our sample, we place a lower limit of $\gt 5\times {10}^{-6}\,{\mathrm{Mpc}}^{-3}$ on the space density of luminous (L IR sime 1013 ${L}_{\odot }$) SMGs at z = 4.40–4.66, suggesting $\geqslant 7$% of SMGs with ${S}_{870\mu {\rm{m}}}\gtrsim 1$ mJy lie at 4 < z < 5. From stacking the high-resolution (~0farcs15 full-width half maximum) ALMA 870 μm imaging, we show that the [C ii] line emission is more extended than the continuum dust emission, with an average effective radius for the [C ii] of ${r}_{{\rm{e}}}={1.7}_{-0.2}^{+0.1}$ kpc, compared to r e = 1.0 ± 0.1 kpc for the continuum (rest-frame 160 μm). By fitting the far-infrared photometry for these galaxies from 100 to 870 μm, we show that SMGs at z ~ 4.5 have a median dust temperature of T d = 55 ± 4 K. This is systematically warmer than 870 μm selected SMGs at z sime 2, which typically have temperatures around 35 K. These z sime 4.5 SMGs display a steeper trend in the luminosity-temperature plane than z ≤ 2 SMGs. We discuss the implications of this result in terms of the selection biases of high-redshift starbursts in far-infrared/submillimeter surveys. |
| first_indexed | 2025-11-14T20:26:50Z |
| format | Article |
| id | nottingham-53120 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T20:26:50Z |
| publishDate | 2018 |
| publisher | American Astronomical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-531202020-05-04T19:45:46Z https://eprints.nottingham.ac.uk/53120/ An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: identifying candidate z∼4.5[CII] emitters Cooke, E.A. Smail, Ian Swinbank, A.M. Stach, S.M. An, Fang Xia Gullberg, B. Almaini, O. Simpson, C.J. Wardlow, J.L. Blain, A.W. Chapman, S.C. Chen, Chian-Chou Conselice, C.J. Coppin, K.E.K. Farrah, D. Maltby, D.T. Michałowski, M.J. Scott, D. Simpson, J.M. Thomson, A.P. Werf, P. van der We report the results of a search for serendipitous [C ii] 157.74 μm emitters at z sime 4.4–4.7 using the Atacama Large Millimeter/submillimeter Array (ALMA). The search exploits the AS2UDS continuum survey, which covers ~50 arcmin2 of the sky toward 695 luminous (S 870 gsim 1 mJy) submillimeter galaxies (SMGs), selected from the SCUBA-2 Cosmology Legacy Survey 0.96 deg2 Ultra Deep Survey (UDS) field. We detect 10 candidate line emitters, with an expected false detection rate of 10%. All of these line emitters correspond to 870 μm continuum-detected sources in AS2UDS. The emission lines in two emitters appear to be high-J CO, but the remainder have multi-wavelength properties consistent with [C ii] from z sime 4.5 galaxies. Using our sample, we place a lower limit of $\gt 5\times {10}^{-6}\,{\mathrm{Mpc}}^{-3}$ on the space density of luminous (L IR sime 1013 ${L}_{\odot }$) SMGs at z = 4.40–4.66, suggesting $\geqslant 7$% of SMGs with ${S}_{870\mu {\rm{m}}}\gtrsim 1$ mJy lie at 4 < z < 5. From stacking the high-resolution (~0farcs15 full-width half maximum) ALMA 870 μm imaging, we show that the [C ii] line emission is more extended than the continuum dust emission, with an average effective radius for the [C ii] of ${r}_{{\rm{e}}}={1.7}_{-0.2}^{+0.1}$ kpc, compared to r e = 1.0 ± 0.1 kpc for the continuum (rest-frame 160 μm). By fitting the far-infrared photometry for these galaxies from 100 to 870 μm, we show that SMGs at z ~ 4.5 have a median dust temperature of T d = 55 ± 4 K. This is systematically warmer than 870 μm selected SMGs at z sime 2, which typically have temperatures around 35 K. These z sime 4.5 SMGs display a steeper trend in the luminosity-temperature plane than z ≤ 2 SMGs. We discuss the implications of this result in terms of the selection biases of high-redshift starbursts in far-infrared/submillimeter surveys. American Astronomical Society 2018-07-10 Article PeerReviewed Cooke, E.A., Smail, Ian, Swinbank, A.M., Stach, S.M., An, Fang Xia, Gullberg, B., Almaini, O., Simpson, C.J., Wardlow, J.L., Blain, A.W., Chapman, S.C., Chen, Chian-Chou, Conselice, C.J., Coppin, K.E.K., Farrah, D., Maltby, D.T., Michałowski, M.J., Scott, D., Simpson, J.M., Thomson, A.P. and Werf, P. van der (2018) An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: identifying candidate z∼4.5[CII] emitters. Astrophysical Journal, 861 (2). p. 100. ISSN 1538-4357 galaxies: high-redshift ; submillimeter: galaxies http://iopscience.iop.org/issue/0004-637X/861/2 doi:10.3847/1538-4357/aac6ba doi:10.3847/1538-4357/aac6ba |
| spellingShingle | galaxies: high-redshift ; submillimeter: galaxies Cooke, E.A. Smail, Ian Swinbank, A.M. Stach, S.M. An, Fang Xia Gullberg, B. Almaini, O. Simpson, C.J. Wardlow, J.L. Blain, A.W. Chapman, S.C. Chen, Chian-Chou Conselice, C.J. Coppin, K.E.K. Farrah, D. Maltby, D.T. Michałowski, M.J. Scott, D. Simpson, J.M. Thomson, A.P. Werf, P. van der An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: identifying candidate z∼4.5[CII] emitters |
| title | An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: identifying candidate z∼4.5[CII] emitters |
| title_full | An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: identifying candidate z∼4.5[CII] emitters |
| title_fullStr | An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: identifying candidate z∼4.5[CII] emitters |
| title_full_unstemmed | An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: identifying candidate z∼4.5[CII] emitters |
| title_short | An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: identifying candidate z∼4.5[CII] emitters |
| title_sort | alma survey of the scuba-2 cosmology legacy survey ukidss/uds field: identifying candidate z∼4.5[cii] emitters |
| topic | galaxies: high-redshift ; submillimeter: galaxies |
| url | https://eprints.nottingham.ac.uk/53120/ https://eprints.nottingham.ac.uk/53120/ https://eprints.nottingham.ac.uk/53120/ |