Molecular gas and dust around a radio-quiet quasar at redshift 4.7
  We report the detection of emission from dust and carbon monoxide in the radio-quiet quasar BR1202--0725 at redshift z=4.7. Maps of these emissions reveal two objects separated by a few arc seconds, which could indicate either the presence of a companion to the quasar or gravitational lensing of the quasar itself. Regardless of the precise interpretation of the maps, the detection of carbon monoxide confirms the presence of a large mass of molecular gas in one of the most distant galaxies known, and shows that conditions conducive to huge bursts of star formation existed in the early Universe. 
Alain Omont, Patrick Petitjean, Stephane Guilloteau, Richard G.   McMahon, P. M. Solomon, Emmanuel Pecontal