The SCUBA-2 Cosmology Legacy Survey: multi-wavelength properties of ALMA-identified submillimeter galaxies in UKIDSS UDS
We present a multi-wavelength analysis of 52 submillimeter galaxies (SMGs), identified using ALMA 870 μm continuum imaging in a pilot program to precisely locate bright SCUBA-2-selected submillimeter sources in the UKIDSS Ultra Deep Survey (UDS) field. Using the available deep (especially near-infra...
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American Astronomical Society
2017
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| Online Access: | https://eprints.nottingham.ac.uk/43884/ |
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| author | Simpson, J.M. Smail, Ian Swinbank, A.M. Ivison, R.J. Dunlop, J.S. Geach, J.E. Almaini, Omar Arumugam, Vinodiran Bremer, M.N. Chen, Chian-Chou Conselice, Christopher J. Coppin, K.E.K. Farrah, D. Ibar, E. Hartley, W.G. Ma, C.J. Michałowski, M.J. Scott, D. Spaans, M. Thomson, A.P. Werf, P. van der |
| author_facet | Simpson, J.M. Smail, Ian Swinbank, A.M. Ivison, R.J. Dunlop, J.S. Geach, J.E. Almaini, Omar Arumugam, Vinodiran Bremer, M.N. Chen, Chian-Chou Conselice, Christopher J. Coppin, K.E.K. Farrah, D. Ibar, E. Hartley, W.G. Ma, C.J. Michałowski, M.J. Scott, D. Spaans, M. Thomson, A.P. Werf, P. van der |
| author_sort | Simpson, J.M. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | We present a multi-wavelength analysis of 52 submillimeter galaxies (SMGs), identified using ALMA 870 μm continuum imaging in a pilot program to precisely locate bright SCUBA-2-selected submillimeter sources in the UKIDSS Ultra Deep Survey (UDS) field. Using the available deep (especially near-infrared) panoramic imaging of the UDS field at optical-to-radio wavelengths we characterize key properties of the SMG population. The median photometric redshift of the bright ALMA/SCUBA-2 UDS (AS2UDS) SMGs that are detected in a sufficient number of wavebands to derive a robust photometric redshift is z = 2.65 ± 0.13. However, similar to previous studies, 27% of the SMGs are too faint at optical-to-near-infrared wavelengths to derive a reliable photometric redshift. Assuming that these SMGs lie at z gsim 3 raises the median redshift of the full sample to z = 2.9 ± 0.2. A subset of 23 unlensed, bright AS2UDS SMGs have sizes measured from resolved imaging of their rest-frame far-infrared emission. We show that the extent and luminosity of the far-infrared emission are consistent with the dust emission arising from regions that are, on average, optically thick at a wavelength of ${\lambda }_{0}\geqslant 75\,\mu {\rm{m}}$ (1σ dispersion of 55–90 μm). Using the dust masses derived from our optically thick spectral energy distribution models, we determine that these galaxies have a median hydrogen column density of N H = 9.8${}_{-0.7}^{+1.4}$ × 1023 cm−2, or a corresponding median V-band obscuration of A v = 540${}_{-40}^{+80}$ mag, averaged along the line of sight to the source of their rest-frame ~200 μm emission. We discuss the implications of this extreme attenuation by dust for the multi-wavelength study of dusty starbursts and reddening-sensitive tracers of star formation. |
| first_indexed | 2025-11-14T19:53:33Z |
| format | Article |
| id | nottingham-43884 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:53:33Z |
| publishDate | 2017 |
| publisher | American Astronomical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-438842020-05-04T18:41:51Z https://eprints.nottingham.ac.uk/43884/ The SCUBA-2 Cosmology Legacy Survey: multi-wavelength properties of ALMA-identified submillimeter galaxies in UKIDSS UDS Simpson, J.M. Smail, Ian Swinbank, A.M. Ivison, R.J. Dunlop, J.S. Geach, J.E. Almaini, Omar Arumugam, Vinodiran Bremer, M.N. Chen, Chian-Chou Conselice, Christopher J. Coppin, K.E.K. Farrah, D. Ibar, E. Hartley, W.G. Ma, C.J. Michałowski, M.J. Scott, D. Spaans, M. Thomson, A.P. Werf, P. van der We present a multi-wavelength analysis of 52 submillimeter galaxies (SMGs), identified using ALMA 870 μm continuum imaging in a pilot program to precisely locate bright SCUBA-2-selected submillimeter sources in the UKIDSS Ultra Deep Survey (UDS) field. Using the available deep (especially near-infrared) panoramic imaging of the UDS field at optical-to-radio wavelengths we characterize key properties of the SMG population. The median photometric redshift of the bright ALMA/SCUBA-2 UDS (AS2UDS) SMGs that are detected in a sufficient number of wavebands to derive a robust photometric redshift is z = 2.65 ± 0.13. However, similar to previous studies, 27% of the SMGs are too faint at optical-to-near-infrared wavelengths to derive a reliable photometric redshift. Assuming that these SMGs lie at z gsim 3 raises the median redshift of the full sample to z = 2.9 ± 0.2. A subset of 23 unlensed, bright AS2UDS SMGs have sizes measured from resolved imaging of their rest-frame far-infrared emission. We show that the extent and luminosity of the far-infrared emission are consistent with the dust emission arising from regions that are, on average, optically thick at a wavelength of ${\lambda }_{0}\geqslant 75\,\mu {\rm{m}}$ (1σ dispersion of 55–90 μm). Using the dust masses derived from our optically thick spectral energy distribution models, we determine that these galaxies have a median hydrogen column density of N H = 9.8${}_{-0.7}^{+1.4}$ × 1023 cm−2, or a corresponding median V-band obscuration of A v = 540${}_{-40}^{+80}$ mag, averaged along the line of sight to the source of their rest-frame ~200 μm emission. We discuss the implications of this extreme attenuation by dust for the multi-wavelength study of dusty starbursts and reddening-sensitive tracers of star formation. American Astronomical Society 2017-04-13 Article PeerReviewed Simpson, J.M., Smail, Ian, Swinbank, A.M., Ivison, R.J., Dunlop, J.S., Geach, J.E., Almaini, Omar, Arumugam, Vinodiran, Bremer, M.N., Chen, Chian-Chou, Conselice, Christopher J., Coppin, K.E.K., Farrah, D., Ibar, E., Hartley, W.G., Ma, C.J., Michałowski, M.J., Scott, D., Spaans, M., Thomson, A.P. and Werf, P. van der (2017) The SCUBA-2 Cosmology Legacy Survey: multi-wavelength properties of ALMA-identified submillimeter galaxies in UKIDSS UDS. Astrophysical Journal, 839 (1). 58/1-58/16. ISSN 1538-4357 Galaxies: evolution Galaxies: high-redshift Galaxies: starburst Submillimeter: galaxies https://doi.org/10.3847/1538-4357/aa65d0 doi:10.3847/1538-4357/aa65d0 doi:10.3847/1538-4357/aa65d0 |
| spellingShingle | Galaxies: evolution Galaxies: high-redshift Galaxies: starburst Submillimeter: galaxies Simpson, J.M. Smail, Ian Swinbank, A.M. Ivison, R.J. Dunlop, J.S. Geach, J.E. Almaini, Omar Arumugam, Vinodiran Bremer, M.N. Chen, Chian-Chou Conselice, Christopher J. Coppin, K.E.K. Farrah, D. Ibar, E. Hartley, W.G. Ma, C.J. Michałowski, M.J. Scott, D. Spaans, M. Thomson, A.P. Werf, P. van der The SCUBA-2 Cosmology Legacy Survey: multi-wavelength properties of ALMA-identified submillimeter galaxies in UKIDSS UDS |
| title | The SCUBA-2 Cosmology Legacy Survey: multi-wavelength properties of ALMA-identified submillimeter galaxies in UKIDSS UDS |
| title_full | The SCUBA-2 Cosmology Legacy Survey: multi-wavelength properties of ALMA-identified submillimeter galaxies in UKIDSS UDS |
| title_fullStr | The SCUBA-2 Cosmology Legacy Survey: multi-wavelength properties of ALMA-identified submillimeter galaxies in UKIDSS UDS |
| title_full_unstemmed | The SCUBA-2 Cosmology Legacy Survey: multi-wavelength properties of ALMA-identified submillimeter galaxies in UKIDSS UDS |
| title_short | The SCUBA-2 Cosmology Legacy Survey: multi-wavelength properties of ALMA-identified submillimeter galaxies in UKIDSS UDS |
| title_sort | scuba-2 cosmology legacy survey: multi-wavelength properties of alma-identified submillimeter galaxies in ukidss uds |
| topic | Galaxies: evolution Galaxies: high-redshift Galaxies: starburst Submillimeter: galaxies |
| url | https://eprints.nottingham.ac.uk/43884/ https://eprints.nottingham.ac.uk/43884/ https://eprints.nottingham.ac.uk/43884/ |