Molecular gas in the host galaxy of a quasar at redshift z = 6.42

  title={Molecular gas in the host galaxy of a quasar at redshift z = 6.42},
  author={Fabian Walter and Frank Bertoldi and Christopher L. Carilli and Pierre Cox and K. Y. Lo and Roberto Neri and Xiaohui Fan and Alain Omont and Michael A. Strauss and Karl M. Menten},
Observations of molecular hydrogen in quasar host galaxies at high redshifts provide fundamental constraints on galaxy evolution, because it is out of this molecular gas that stars form. Molecular hydrogen is traced by emission from the carbon monoxide molecule, CO; cold H2 itself is generally not observable. Carbon monoxide has been detected in about ten quasar host galaxies with redshifts z > 2; the record-holder is at z = 4.69 (refs 1–3). Here we report CO emission from the quasar SDSS… 
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