Journal
SCIENCE
Volume 300, Issue 5620, Pages 773-775Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1082600
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Images of the molecular CO 2-1 line emission and the radio continuum emission from the redshift 4.12 gravitationally lensed quasi-stellar object (QSO) PSS J2322 + 1944 reveal an Einstein ring with a diameter of 1.5. These observations are modeled as a star-forming disk surrounding the QSO nucleus with a radius of 2 kiloparsecs. The implied massive star formation rate is 900 solar masses per year. At this rate, a substantial fraction of the stars in a large elliptical galaxy could form on a dynamical time scale of 10(8) years. The observation of active star formation in the host galaxy of a high-redshift QSO supports the hypothesis of coeval formation of supermassive black holes and stars in spheroidal galaxies.
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