Résumé :
Star-forming galaxies at high redshift can be identified in the rest-UV
by broad-band imaging in filters which straddle the Lyman break, or in the
rest-FIR by sensitive submillimeter bolometry. The orthogonality of these
selection techniques means that key physical parameters of the two
populations remain poorly understood. Using the IRAM 30m telescope and
Plateau de Bure interferometer, we have obtained sensitive observations of
continuum and molecular line emission from both Lyman break and
submillimeter galaxies, allowing us to place new constraints on the
systems' total masses and rates of star formation. I will discuss the
implications of these results for models of structure formation and the
production of the submillimeter background.
