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Hodge (MPIA), Mark Dickinson (NOAO), Mark T. Sargent (CEA-Saclay), Matthieu Bethermin (CEA-Saclay), Maurilio Pannella (CEA-Saclay), Qinghua Tan (PMO, Yu Gao (PMO)","submitted_at":"2013-09-21T08:17:15Z","abstract_excerpt":"We present deep IRAM Plateau de Bure Interferometer (PdBI) observations, searching for CO-emission toward two massive, non-lensed Lyman break galaxies (LBGs) at z=3.216 and 4.058. With one low significance CO detection (3.5 sigma) and one sensitive upper limit, we find that the CO lines are >~ 3-4 times weaker than expected based on the relation between IR and CO luminosities followed by similarly, massive galaxies at z=0-2.5. 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