Detection of molecular gas in a distant submillimetre galaxy at z=4.76 with ATCA

Coppin, Kristen, Chapman, Scott, Smail, Ian, Swinbank, Mark, Walter, Fabian, Wardlow, Julie, Weiss, Axel, M. Alexander, David, Brandt, Niel, Dannerbauer, Helmut, De Breuck, Carlos, Dickinson, Mark, Dunlop, James, Edge, Alastair, Emonts, Bjorn, Greve, Thomas, Huynh, Minh, Ivison, Rob, Knudsen, Kirsten, Menten, Karl, Schinnerer, Eva and van der Werf, Paul (2010) Detection of molecular gas in a distant submillimetre galaxy at z=4.76 with ATCA. Monthly Notices of the Royal Astronomical Society: Letters, 407. pp. 103-107. ISSN 1745-3933

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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 (FWHM of 160 km/s) of the CO(2--1) line emission to constrain the gas and dynamical mass of Mgas~1.6x10^10 Msun and Mdyn(