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The gravitational magnification provided by massive galaxy clusters makes itpossible to probe the physical conditions in distant galaxies that are of lowerluminosity than those in blank fields and likely more representative of thebulk of the high-redshift galaxy population. We aim to constrain the basicproperties of molecular gas in a strongly magnified submm galaxy located behindthe massive Bullet Cluster. This galaxy (SMM J0658) is split into three images,with a total magnification factor of almost 100. We used the AustraliaTelescope Compact Array (ATCA) to search for {12}CO(1--0) and {12}CO(3--2) lineemission from SMM J0658. We also used the SABOCA bolometer camera on theAtacama Pathfinder EXperiment (APEX) telescope to measure the continuumemission at 350 micron. CO(1--0) and CO(3--2) are detected at 6.8 sigma and 7.5sigma significance when the spectra toward the two brightest images of thegalaxy are combined. From the CO(1-0) luminosity we derive a mass of coldmolecular gas of (1.8 \pm 0.3) * 10^9 Msun, using the CO to H_2 conversionfactor commonly used for luminous infrared galaxies. This is 45 \pm 25 % of thestellar mass. From the width of the CO lines we derive a dynamical mass withinthe CO-emitting region L of (1.3 \pm 0.4) * 10^10 (L/1 kpc) Msun. We refine theredshift determination of SMM J0658 to z=2.7793 \pm 0.0003. Continuum emissionat 350 micron from SMM J0658 was detected with SABOCA at a signal-to-noiseratio of 3.6. We study the spectral energy distribution of SMM J0658 and derivea dust temperature of 33\pm 5 K and a dust mass of 1.1*10^7 Msun. SMM J0658 isone of the least massive submm galaxies discovered so far. As a likelyrepresentative of the bulk of the submm galaxy population, it is a prime targetfor future observations.

Molecular gas and dust in the highly magnified z = 2.8 galaxy behind the Bullet Cluster