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

Coppin, K. E. K. and Chapman, S. C. and Smail, Ian and Swinbank, A. M. and Walter, F. and Wardlow, J. L. and Weiss, A. and Alexander, D. M. and Brandt, W. N. and Dannerbauer, H. and De Breuck, C. and Dickinson, M. and Dunlop, J. S. and Edge, A. C. and Emonts, B. H. C. and Greve, T. R. and Huynh, M. and Ivison, R. J. and Knudsen, K. K. and Menten, K. M. and Schinnerer, E. and van der Werf, P. P. (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, 407 (1). L103-L107. ISSN 1745-3925

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Abstract

We have detected the CO(2-1) transition from the submillimetre galaxy (SMG) LESSJ033229.4-275619 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 ~=160kms-1) of the CO(2-1) line emission to constrain the gas and dynamical mass of Mgas ~= 1.6 × 1010Msolar and Mdyn(