An ALMA survey of sub-millimetre galaxies in the extended chandra deep field south

The far-infrared properties of SMGs

A. M. Swinbank, J. M. Simpson, Ian Smail, C. M. Harrison, J. A. Hodge, A. Karim, F. Walter, D. M. Alexander, William Nielsen Brandt, C. de Breuck, E. da Cunha, S. C. Chapman, K. E.K. Coppin, A. L.R. Danielson, H. Dannerbauer, R. Decarli, T. R. Greve, R. J. Ivison, K. K. Knudsen, C. D.P. Lagos & 5 others E. Schinnerer, A. P. Thomson, J. L. Wardlow, A. Weiß, P. van der Werf

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Abstract

We exploit Atacama Large Millimeter Array (ALMA) 870 μm observations of sub-millimetre sources in the Extended Chandra Deep Field South to investigate the far-infrared properties of high-redshift sub-millimetre galaxies (SMGs). Using the precisely located 870 μmALMA positions of 99 SMGs, together with 24μm and radio imaging, we deblend the Herschel/SPIRE imaging to extract their far-infrared fluxes and colours. The median redshifts for ALMA LESS (ALESS) SMGs which are detected in at least two SPIRE bands increases with wavelength of the peak in their spectral energy distributions (SEDs), with z = 2.3 ± 0.2, 2.5 ± 0.3 and 3.5 ± 0.5 for the 250, 350 and 500 μm peakers, respectively. 34 ALESS SMGs do not have a >3σ counterpart at 250, 350 or 500 μm. These galaxies have a median photometric redshift derived from the rest-frame UV-mid-infrared SEDs of z = 3.3 ± 0.5, which is higher than the full ALESS SMG sample; z = 2.5 ± 0.2. We estimate the far-infrared luminosities and characteristic dust temperature of each SMG, deriving LIR = (3.0 ± 0.3) × 1012 L (SFR = 300 ± 30M yr-1) and Td = 32 ± 1K. The characteristic dust temperature of these high-redshift SMGs is ΔTd = 3-5K lower than comparably luminous galaxies at z = 0, reflecting the more extended star formation in these systems. We show that the contribution of S870μm ≤ 1 mJy SMGs to the cosmic star formation budget is 20 per cent of the total over the redshift range z ~ 1-4. Adopting an appropriate gas-to-dust ratio, we estimate a typical molecular mass of the ALESS SMGs of MH2 = (4.2 ± 0.4) × 1010M. Finally, we show that SMGs with S870μm > 1mJy (LIR > 1012 L) contain ~ 10 per cent of the z ~ 2 volume-averaged H2 mass density.

Original languageEnglish (US)
Article numberstt2273
Pages (from-to)1267-1287
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Volume438
Issue number2
DOIs
StatePublished - Mar 1 2014

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galaxies
dust
energy
temperature
radio
wavelength
spectral energy distribution
gas
star formation
distribution
estimates
budgets
luminosity
color
budget
gases
wavelengths

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Swinbank, A. M., Simpson, J. M., Smail, I., Harrison, C. M., Hodge, J. A., Karim, A., ... van der Werf, P. (2014). An ALMA survey of sub-millimetre galaxies in the extended chandra deep field south: The far-infrared properties of SMGs. Monthly Notices of the Royal Astronomical Society, 438(2), 1267-1287. [stt2273]. https://doi.org/10.1093/mnras/stt2273
Swinbank, A. M. ; Simpson, J. M. ; Smail, Ian ; Harrison, C. M. ; Hodge, J. A. ; Karim, A. ; Walter, F. ; Alexander, D. M. ; Brandt, William Nielsen ; de Breuck, C. ; da Cunha, E. ; Chapman, S. C. ; Coppin, K. E.K. ; Danielson, A. L.R. ; Dannerbauer, H. ; Decarli, R. ; Greve, T. R. ; Ivison, R. J. ; Knudsen, K. K. ; Lagos, C. D.P. ; Schinnerer, E. ; Thomson, A. P. ; Wardlow, J. L. ; Weiß, A. ; van der Werf, P. / An ALMA survey of sub-millimetre galaxies in the extended chandra deep field south : The far-infrared properties of SMGs. In: Monthly Notices of the Royal Astronomical Society. 2014 ; Vol. 438, No. 2. pp. 1267-1287.
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title = "An ALMA survey of sub-millimetre galaxies in the extended chandra deep field south: The far-infrared properties of SMGs",
abstract = "We exploit Atacama Large Millimeter Array (ALMA) 870 μm observations of sub-millimetre sources in the Extended Chandra Deep Field South to investigate the far-infrared properties of high-redshift sub-millimetre galaxies (SMGs). Using the precisely located 870 μmALMA positions of 99 SMGs, together with 24μm and radio imaging, we deblend the Herschel/SPIRE imaging to extract their far-infrared fluxes and colours. The median redshifts for ALMA LESS (ALESS) SMGs which are detected in at least two SPIRE bands increases with wavelength of the peak in their spectral energy distributions (SEDs), with z = 2.3 ± 0.2, 2.5 ± 0.3 and 3.5 ± 0.5 for the 250, 350 and 500 μm peakers, respectively. 34 ALESS SMGs do not have a >3σ counterpart at 250, 350 or 500 μm. These galaxies have a median photometric redshift derived from the rest-frame UV-mid-infrared SEDs of z = 3.3 ± 0.5, which is higher than the full ALESS SMG sample; z = 2.5 ± 0.2. We estimate the far-infrared luminosities and characteristic dust temperature of each SMG, deriving LIR = (3.0 ± 0.3) × 1012 L⊙ (SFR = 300 ± 30M⊙ yr-1) and Td = 32 ± 1K. The characteristic dust temperature of these high-redshift SMGs is ΔTd = 3-5K lower than comparably luminous galaxies at z = 0, reflecting the more extended star formation in these systems. We show that the contribution of S870μm ≤ 1 mJy SMGs to the cosmic star formation budget is 20 per cent of the total over the redshift range z ~ 1-4. Adopting an appropriate gas-to-dust ratio, we estimate a typical molecular mass of the ALESS SMGs of MH2 = (4.2 ± 0.4) × 1010M⊙. Finally, we show that SMGs with S870μm > 1mJy (LIR > 1012 L⊙) contain ~ 10 per cent of the z ~ 2 volume-averaged H2 mass density.",
author = "Swinbank, {A. M.} and Simpson, {J. M.} and Ian Smail and Harrison, {C. M.} and Hodge, {J. A.} and A. Karim and F. Walter and Alexander, {D. M.} and Brandt, {William Nielsen} and {de Breuck}, C. and {da Cunha}, E. and Chapman, {S. C.} and Coppin, {K. E.K.} and Danielson, {A. L.R.} and H. Dannerbauer and R. Decarli and Greve, {T. R.} and Ivison, {R. J.} and Knudsen, {K. K.} and Lagos, {C. D.P.} and E. Schinnerer and Thomson, {A. P.} and Wardlow, {J. L.} and A. Wei{\ss} and {van der Werf}, P.",
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language = "English (US)",
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Swinbank, AM, Simpson, JM, Smail, I, Harrison, CM, Hodge, JA, Karim, A, Walter, F, Alexander, DM, Brandt, WN, de Breuck, C, da Cunha, E, Chapman, SC, Coppin, KEK, Danielson, ALR, Dannerbauer, H, Decarli, R, Greve, TR, Ivison, RJ, Knudsen, KK, Lagos, CDP, Schinnerer, E, Thomson, AP, Wardlow, JL, Weiß, A & van der Werf, P 2014, 'An ALMA survey of sub-millimetre galaxies in the extended chandra deep field south: The far-infrared properties of SMGs', Monthly Notices of the Royal Astronomical Society, vol. 438, no. 2, stt2273, pp. 1267-1287. https://doi.org/10.1093/mnras/stt2273

An ALMA survey of sub-millimetre galaxies in the extended chandra deep field south : The far-infrared properties of SMGs. / Swinbank, A. M.; Simpson, J. M.; Smail, Ian; Harrison, C. M.; Hodge, J. A.; Karim, A.; Walter, F.; Alexander, D. M.; Brandt, William Nielsen; de Breuck, C.; da Cunha, E.; Chapman, S. C.; Coppin, K. E.K.; Danielson, A. L.R.; Dannerbauer, H.; Decarli, R.; Greve, T. R.; Ivison, R. J.; Knudsen, K. K.; Lagos, C. D.P.; Schinnerer, E.; Thomson, A. P.; Wardlow, J. L.; Weiß, A.; van der Werf, P.

In: Monthly Notices of the Royal Astronomical Society, Vol. 438, No. 2, stt2273, 01.03.2014, p. 1267-1287.

Research output: Contribution to journalArticle

TY - JOUR

T1 - An ALMA survey of sub-millimetre galaxies in the extended chandra deep field south

T2 - The far-infrared properties of SMGs

AU - Swinbank, A. M.

AU - Simpson, J. M.

AU - Smail, Ian

AU - Harrison, C. M.

AU - Hodge, J. A.

AU - Karim, A.

AU - Walter, F.

AU - Alexander, D. M.

AU - Brandt, William Nielsen

AU - de Breuck, C.

AU - da Cunha, E.

AU - Chapman, S. C.

AU - Coppin, K. E.K.

AU - Danielson, A. L.R.

AU - Dannerbauer, H.

AU - Decarli, R.

AU - Greve, T. R.

AU - Ivison, R. J.

AU - Knudsen, K. K.

AU - Lagos, C. D.P.

AU - Schinnerer, E.

AU - Thomson, A. P.

AU - Wardlow, J. L.

AU - Weiß, A.

AU - van der Werf, P.

PY - 2014/3/1

Y1 - 2014/3/1

N2 - We exploit Atacama Large Millimeter Array (ALMA) 870 μm observations of sub-millimetre sources in the Extended Chandra Deep Field South to investigate the far-infrared properties of high-redshift sub-millimetre galaxies (SMGs). Using the precisely located 870 μmALMA positions of 99 SMGs, together with 24μm and radio imaging, we deblend the Herschel/SPIRE imaging to extract their far-infrared fluxes and colours. The median redshifts for ALMA LESS (ALESS) SMGs which are detected in at least two SPIRE bands increases with wavelength of the peak in their spectral energy distributions (SEDs), with z = 2.3 ± 0.2, 2.5 ± 0.3 and 3.5 ± 0.5 for the 250, 350 and 500 μm peakers, respectively. 34 ALESS SMGs do not have a >3σ counterpart at 250, 350 or 500 μm. These galaxies have a median photometric redshift derived from the rest-frame UV-mid-infrared SEDs of z = 3.3 ± 0.5, which is higher than the full ALESS SMG sample; z = 2.5 ± 0.2. We estimate the far-infrared luminosities and characteristic dust temperature of each SMG, deriving LIR = (3.0 ± 0.3) × 1012 L⊙ (SFR = 300 ± 30M⊙ yr-1) and Td = 32 ± 1K. The characteristic dust temperature of these high-redshift SMGs is ΔTd = 3-5K lower than comparably luminous galaxies at z = 0, reflecting the more extended star formation in these systems. We show that the contribution of S870μm ≤ 1 mJy SMGs to the cosmic star formation budget is 20 per cent of the total over the redshift range z ~ 1-4. Adopting an appropriate gas-to-dust ratio, we estimate a typical molecular mass of the ALESS SMGs of MH2 = (4.2 ± 0.4) × 1010M⊙. Finally, we show that SMGs with S870μm > 1mJy (LIR > 1012 L⊙) contain ~ 10 per cent of the z ~ 2 volume-averaged H2 mass density.

AB - We exploit Atacama Large Millimeter Array (ALMA) 870 μm observations of sub-millimetre sources in the Extended Chandra Deep Field South to investigate the far-infrared properties of high-redshift sub-millimetre galaxies (SMGs). Using the precisely located 870 μmALMA positions of 99 SMGs, together with 24μm and radio imaging, we deblend the Herschel/SPIRE imaging to extract their far-infrared fluxes and colours. The median redshifts for ALMA LESS (ALESS) SMGs which are detected in at least two SPIRE bands increases with wavelength of the peak in their spectral energy distributions (SEDs), with z = 2.3 ± 0.2, 2.5 ± 0.3 and 3.5 ± 0.5 for the 250, 350 and 500 μm peakers, respectively. 34 ALESS SMGs do not have a >3σ counterpart at 250, 350 or 500 μm. These galaxies have a median photometric redshift derived from the rest-frame UV-mid-infrared SEDs of z = 3.3 ± 0.5, which is higher than the full ALESS SMG sample; z = 2.5 ± 0.2. We estimate the far-infrared luminosities and characteristic dust temperature of each SMG, deriving LIR = (3.0 ± 0.3) × 1012 L⊙ (SFR = 300 ± 30M⊙ yr-1) and Td = 32 ± 1K. The characteristic dust temperature of these high-redshift SMGs is ΔTd = 3-5K lower than comparably luminous galaxies at z = 0, reflecting the more extended star formation in these systems. We show that the contribution of S870μm ≤ 1 mJy SMGs to the cosmic star formation budget is 20 per cent of the total over the redshift range z ~ 1-4. Adopting an appropriate gas-to-dust ratio, we estimate a typical molecular mass of the ALESS SMGs of MH2 = (4.2 ± 0.4) × 1010M⊙. Finally, we show that SMGs with S870μm > 1mJy (LIR > 1012 L⊙) contain ~ 10 per cent of the z ~ 2 volume-averaged H2 mass density.

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