The SCUBA-2 Cosmology Legacy Survey: Multi-wavelength Properties of ALMA-identified Submillimeter Galaxies in UKIDSS-UDS
| Autor: | J. M. Simpson, Ian Smail, A. M. Swinbank, R. J. Ivison, J. S. Dunlop, J. E. Geach, O. Almaini, V. Arumugam, M. N. Bremer, Chian-Chou Chen, C. Conselice, K. E. K. Coppin, D. Farrah, E. Ibar, W. G. Hartley, C. J. Ma, M. J. Michałowski, D. Scott, M. Spaans, A. P. Thomson, P. P. van der Werf |
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| Přispěvatelé: | Astronomy |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
submillimeter: galaxies
Population FOS: Physical sciences galaxies: starburst Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences ARP 220 Cosmology galaxies: high-redshift 0103 physical sciences STAR-FORMING GALAXIES SPACE-TELESCOPE education NUMBER COUNTS 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Photometric redshift Physics education.field_of_study DEGREE EXTRAGALACTIC SURVEY Line-of-sight 010308 nuclear & particles physics Star formation Astronomy and Astrophysics Galaxies: evolution Galaxies: high-redshift Galaxies: starburst Submillimeter: galaxies Astrophysics - Astrophysics of Galaxies Galaxy Redshift 850 MU-M 13. Climate action Space and Planetary Science NUCLEAR DISKS IMAGING SURVEY Astrophysics of Galaxies (astro-ph.GA) Spectral energy distribution DEEP-FIELD-SOUTH Astrophysics::Earth and Planetary Astrophysics HIGH-REDSHIFT galaxies: evolution |
| Zdroj: | ASTROPHYSICAL JOURNAL (ISSN 0004-637X), 839(1), 58 Astrophysical journal, 2017, Vol.839(1), pp.58 [Peer Reviewed Journal] The Astrophysical Journal, 839(1):58. IOP PUBLISHING LTD Simpson, J M, Smail, I, Swinbank, A M, Ivison, R J, Dunlop, J S, Geach, J E, Almaini, O, Arumugam, V, Bremer, M N, Chen, C-C, Conselice, C, Coppin, K E K, Farrah, D, Ibar, E, Hartley, W G, Ma, C-J, Michalowski, M J, Spaans, M, Thomson, A P & van der Werf, P P 2017, ' The SCUBA-2 Cosmology Legacy Survey : Multi-wavelength Properties of ALMA-identified Submillimeter Galaxies in UKIDSS-UDS ', Astrophysical Journal, vol. 839, no. 1, 58 . https://doi.org/10.3847/1538-4357/aa65d0 |
| ISSN: | 0004-637X 1538-4357 |
| Popis: | We present a multi-wavelength analysis of 52 sub-millimeter galaxies (SMGs), identified using ALMA 870$\mu$m continuum imaging in a pilot program to precisely locate bright SCUBA2-selected sub-mm 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$\pm$0.13. However, similar to previous studies, 27% of the SMGs are too faint at optical-to-near-infrared wavelengths to derive a reliable photometric redshift. Assuming that these SMGs lie at z$\gtrsim$3 raises the median redshift of the full sample to $z$=2.9$\pm$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 optically thick, on average, at a wavelength of $\lambda_0$$\ge$75$\mu$m (1-$\sigma$ dispersion of 55-90$\mu$m). Using the dust masses derived from our optically-thick spectral energy distribution models we determine that these galaxies have a median hydrogen column density of $N_{H}$=9.8$_{-0.7}^{+1.4}$$\times$10$^{23}$cm$^{-2}$, or a corresponding median $V$-band obscuration of $A_\mathrm{v}$=540$^{+80}_{-40}$mag, averaged along the line of sight to the source of their restframe $\sim$200$\mu$m emission. We discuss the implications of this extreme attenuation by dust for the multiwavelength study of dusty starbursts and reddening-sensitive tracers of star formation. Comment: Accepted for publication in ApJ |
| Databáze: | OpenAIRE |
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