Physical Conditions of the Gas in an ALMA [CII]-identified Submillimetre Galaxy at z = 4.44
- Huynh, M. T.
- Norris, R. P.
- Coppin, Kristen
- 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.
- Walter, F.
- Weiss, A.
DOIAbstract
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 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, combi...
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