Detection of molecular gas in a distant submillimetre galaxy at z = 4.76 with Australia Telescope Compact Array

K. E.K. Coppin, S. C. Chapman, Ian Smail, A. M. Swinbank, F. Walter, J. L. Wardlow, A. Weiss, D. M. Alexander, William Nielsen Brandt, H. Dannerbauer, C. De Breuck, M. Dickinson, J. S. Dunlop, A. C. Edge, B. H.C. Emonts, T. R. Greve, M. Huynh, R. J. Ivison, K. K. Knudsen, K. M. Menten & 2 others E. Schinnerer, P. P. van der Werf

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Abstract

We have detected the CO(2-1) transition from the submillimetre galaxy (SMG) LESS J033229.4-275619 at z = 4.755 using the new Compact Array Broadband Backend system on the Australian Telescope Compact Array. These data have identified a massive gas reservoir available for star formation for the first time in an SMG at z ~ 5. We use the luminosity and velocity width (full width at half-maximum, FWHM, of ≈ 160 km s-1) of the CO(2-1) line emission to constrain the gas and dynamical mass of Mgas ≈1.6x 1010 M⊙ and Mdyn(<2kpc) ≈5x 1010 (0.25/sin2i)MQ, respectively, similar to that observed for SMGs at lower redshifts of z ~ 2-4, although we note that our observed CO FWHM is a factor of ~3 narrower than typically seen in SMGs. Together with the stellar mass we estimate a total baryonic mass of Mbary ≈1 × 1011 M⊙, consistent with the dynamical mass for this young galaxy within the uncertainties. Dynamical and baryonic mass limits of high-redshift galaxies are useful tests of galaxy formation models: using the known z ~ 4-5 SMGs as examples of massive baryonic systems, we find that their space density is consistent with that predicted by current galaxy formation models. In addition, these observations have helped to confirm that z ~ 4-5 SMGs possess the baryonic masses and gas consumption time-scales necessary to be the progenitors of the luminous old red galaxies seen at z ~ 3. Our results provide a preview of the science that ALMA will enable on the formation and evolution of the earliest massive galaxies in the Universe.

Original languageEnglish (US)
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume407
Issue number1
DOIs
StatePublished - Sep 1 2010

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molecular gases
telescopes
galaxies
gas
galactic evolution
gases
space density
stellar mass
detection
star formation
universe
luminosity
broadband
timescale
estimates

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Coppin, K. E.K. ; Chapman, S. C. ; Smail, Ian ; Swinbank, A. M. ; Walter, F. ; Wardlow, J. L. ; Weiss, A. ; Alexander, D. M. ; Brandt, William Nielsen ; Dannerbauer, H. ; De Breuck, C. ; Dickinson, M. ; Dunlop, J. S. ; Edge, A. C. ; Emonts, B. H.C. ; Greve, T. R. ; Huynh, M. ; Ivison, R. J. ; Knudsen, K. K. ; Menten, K. M. ; Schinnerer, E. ; van der Werf, P. P. / Detection of molecular gas in a distant submillimetre galaxy at z = 4.76 with Australia Telescope Compact Array. In: Monthly Notices of the Royal Astronomical Society: Letters. 2010 ; Vol. 407, No. 1.
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abstract = "We have detected the CO(2-1) transition from the submillimetre galaxy (SMG) LESS J033229.4-275619 at z = 4.755 using the new Compact Array Broadband Backend system on the Australian Telescope Compact Array. These data have identified a massive gas reservoir available for star formation for the first time in an SMG at z ~ 5. We use the luminosity and velocity width (full width at half-maximum, FWHM, of ≈ 160 km s-1) of the CO(2-1) line emission to constrain the gas and dynamical mass of Mgas ≈1.6x 1010 M⊙ and Mdyn(<2kpc) ≈5x 1010 (0.25/sin2i)MQ, respectively, similar to that observed for SMGs at lower redshifts of z ~ 2-4, although we note that our observed CO FWHM is a factor of ~3 narrower than typically seen in SMGs. Together with the stellar mass we estimate a total baryonic mass of Mbary ≈1 × 1011 M⊙, consistent with the dynamical mass for this young galaxy within the uncertainties. Dynamical and baryonic mass limits of high-redshift galaxies are useful tests of galaxy formation models: using the known z ~ 4-5 SMGs as examples of massive baryonic systems, we find that their space density is consistent with that predicted by current galaxy formation models. In addition, these observations have helped to confirm that z ~ 4-5 SMGs possess the baryonic masses and gas consumption time-scales necessary to be the progenitors of the luminous old red galaxies seen at z ~ 3. Our results provide a preview of the science that ALMA will enable on the formation and evolution of the earliest massive galaxies in the Universe.",
author = "Coppin, {K. E.K.} and Chapman, {S. C.} and Ian Smail and Swinbank, {A. M.} and F. Walter and Wardlow, {J. L.} and A. Weiss and Alexander, {D. M.} and Brandt, {William Nielsen} and H. Dannerbauer and {De Breuck}, C. and M. Dickinson and Dunlop, {J. S.} and Edge, {A. C.} and Emonts, {B. H.C.} and Greve, {T. R.} and M. Huynh and Ivison, {R. J.} and Knudsen, {K. K.} and Menten, {K. M.} and E. Schinnerer and {van der Werf}, {P. P.}",
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Coppin, KEK, Chapman, SC, Smail, I, Swinbank, AM, Walter, F, Wardlow, JL, Weiss, A, Alexander, DM, Brandt, WN, Dannerbauer, H, De Breuck, C, Dickinson, M, Dunlop, JS, Edge, AC, Emonts, BHC, Greve, TR, Huynh, M, Ivison, RJ, Knudsen, KK, Menten, KM, Schinnerer, E & van der Werf, PP 2010, 'Detection of molecular gas in a distant submillimetre galaxy at z = 4.76 with Australia Telescope Compact Array', Monthly Notices of the Royal Astronomical Society: Letters, vol. 407, no. 1. https://doi.org/10.1111/j.1745-3933.2010.00914.x

Detection of molecular gas in a distant submillimetre galaxy at z = 4.76 with Australia Telescope Compact Array. / Coppin, K. E.K.; Chapman, S. C.; Smail, Ian; Swinbank, A. M.; Walter, F.; Wardlow, J. L.; Weiss, A.; Alexander, D. M.; Brandt, William Nielsen; Dannerbauer, H.; De Breuck, C.; Dickinson, M.; Dunlop, J. S.; Edge, A. C.; Emonts, B. H.C.; Greve, T. R.; Huynh, M.; Ivison, R. J.; Knudsen, K. K.; Menten, K. M.; Schinnerer, E.; van der Werf, P. P.

In: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 407, No. 1, 01.09.2010.

Research output: Contribution to journalLetter

TY - JOUR

T1 - Detection of molecular gas in a distant submillimetre galaxy at z = 4.76 with Australia Telescope Compact Array

AU - Coppin, K. E.K.

AU - Chapman, S. C.

AU - Smail, Ian

AU - Swinbank, A. M.

AU - Walter, F.

AU - Wardlow, J. L.

AU - Weiss, A.

AU - Alexander, D. M.

AU - Brandt, William Nielsen

AU - Dannerbauer, H.

AU - De Breuck, C.

AU - Dickinson, M.

AU - Dunlop, J. S.

AU - Edge, A. C.

AU - Emonts, B. H.C.

AU - Greve, T. R.

AU - Huynh, M.

AU - Ivison, R. J.

AU - Knudsen, K. K.

AU - Menten, K. M.

AU - Schinnerer, E.

AU - van der Werf, P. P.

PY - 2010/9/1

Y1 - 2010/9/1

N2 - We have detected the CO(2-1) transition from the submillimetre galaxy (SMG) LESS J033229.4-275619 at z = 4.755 using the new Compact Array Broadband Backend system on the Australian Telescope Compact Array. These data have identified a massive gas reservoir available for star formation for the first time in an SMG at z ~ 5. We use the luminosity and velocity width (full width at half-maximum, FWHM, of ≈ 160 km s-1) of the CO(2-1) line emission to constrain the gas and dynamical mass of Mgas ≈1.6x 1010 M⊙ and Mdyn(<2kpc) ≈5x 1010 (0.25/sin2i)MQ, respectively, similar to that observed for SMGs at lower redshifts of z ~ 2-4, although we note that our observed CO FWHM is a factor of ~3 narrower than typically seen in SMGs. Together with the stellar mass we estimate a total baryonic mass of Mbary ≈1 × 1011 M⊙, consistent with the dynamical mass for this young galaxy within the uncertainties. Dynamical and baryonic mass limits of high-redshift galaxies are useful tests of galaxy formation models: using the known z ~ 4-5 SMGs as examples of massive baryonic systems, we find that their space density is consistent with that predicted by current galaxy formation models. In addition, these observations have helped to confirm that z ~ 4-5 SMGs possess the baryonic masses and gas consumption time-scales necessary to be the progenitors of the luminous old red galaxies seen at z ~ 3. Our results provide a preview of the science that ALMA will enable on the formation and evolution of the earliest massive galaxies in the Universe.

AB - We have detected the CO(2-1) transition from the submillimetre galaxy (SMG) LESS J033229.4-275619 at z = 4.755 using the new Compact Array Broadband Backend system on the Australian Telescope Compact Array. These data have identified a massive gas reservoir available for star formation for the first time in an SMG at z ~ 5. We use the luminosity and velocity width (full width at half-maximum, FWHM, of ≈ 160 km s-1) of the CO(2-1) line emission to constrain the gas and dynamical mass of Mgas ≈1.6x 1010 M⊙ and Mdyn(<2kpc) ≈5x 1010 (0.25/sin2i)MQ, respectively, similar to that observed for SMGs at lower redshifts of z ~ 2-4, although we note that our observed CO FWHM is a factor of ~3 narrower than typically seen in SMGs. Together with the stellar mass we estimate a total baryonic mass of Mbary ≈1 × 1011 M⊙, consistent with the dynamical mass for this young galaxy within the uncertainties. Dynamical and baryonic mass limits of high-redshift galaxies are useful tests of galaxy formation models: using the known z ~ 4-5 SMGs as examples of massive baryonic systems, we find that their space density is consistent with that predicted by current galaxy formation models. In addition, these observations have helped to confirm that z ~ 4-5 SMGs possess the baryonic masses and gas consumption time-scales necessary to be the progenitors of the luminous old red galaxies seen at z ~ 3. Our results provide a preview of the science that ALMA will enable on the formation and evolution of the earliest massive galaxies in the Universe.

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U2 - 10.1111/j.1745-3933.2010.00914.x

DO - 10.1111/j.1745-3933.2010.00914.x

M3 - Letter

VL - 407

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

SN - 1745-3925

IS - 1

ER -