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Physical Conditions of the Gas in an ALMA [CII]-identified Submillimetre Galaxy at z = 4.44

  • Huynh, M. T.
  • Norris, R. P.
  • Coppin, K. E. K.
  • Emonts, B. H. C.
  • Ivison, R. J.
  • Seymour, N.
  • Smail, Ian
  • Smolcic, V.
  • Swinbank, A. M.
  • Brandt, W. N.
  • Chapman, S. C.
  • Dannerbauer, H.
  • De Breuck, C.
  • Greve, T. R.
  • Hodge, J. A.
  • Karim, A.
  • Knudsen, K. K.
  • Menten, K. M.
  • van der Werf, P. P.
  • Walter, F.
  • And 1 more
Publication Date
Feb 13, 2013
Submission Date
Feb 13, 2013
DOI: 10.1093/mnrasl/slt014
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We present CO(2-1) observations of the submillimetre galaxy ALESS65.1 performed with the Australia Telescope Compact Array at 42.3 GHz. A previous ALMA study of submillimetre galaxies in the Extended Chandra Deep Field South detected [CII] 157.74 micron emission from this galaxy at a redshift of z = 4.44. No CO(2-1) emission was detected but we derive a firm upper limit to the cold gas mass in ALESS65.1 of M_gas < 1.7 x 10^10 M_odot. The estimated gas depletion timescale is <50 Myr, which is similar to other high redshift SMGs, and consistent with z > 4 SMGs being the likely progenitors of massive red-and-dead galaxies at z > 2. The ratio of the [CII], CO and far-infrared luminosities implies a strong far-ultraviolet field of G_0 > 10^3, as seen in Galactic star forming regions or local ULIRGs. The observed L_[CII]/L_FIR = 2.3 x 10^{-3} is high compared to local ULIRGs and, combined with L_[CII]/L_CO > 2700, it is consistent with ALESS65.1 either having an extended (several kpc) [CII] emitting region or lower than solar metallicity.

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