A spectroscopic redshift survey of extraordinarily bright millimetre-wave-selected sources of carbon monoxide line emission — originating from star-forming molecular gas — shows that at least ten of these sources lie at redshifts greater than four, indicating that the fraction of dusty starburst galaxies at high redshifts is greater than previously thought.
- J. D. Vieira
- D. P. Marrone
- R. Williamson
