Highly redshifted molecular observations

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CO has already been detected by millimetre interferometers (mostly IRAM) in ~10 sources at large redshift (z > 1).The most recent results are reviewed with an emphasis on those at z > 4. The detections are presently achieved in exceptionally bright objects (QSOs, radiogalaxies...), with many cases of amplification by gravitational lensing. However, the rapid rate of submillimetre detections of dust emission by field galaxies with SCUBA and ISO suggests that the present CO detections could be representative of the bright end of the far-IR luminosity function of these objects. The existing detections and the parallel development of continuum mm-submm studies allow a very preliminary discussion of their properties to be sketched: ratio of CO to dust emission, dust (and gas) temperature, far-IR luminosity, star formation rate, extension of the starburst region, width of the velocity distribution, mass of molecular gas, importance of gravitational lensing, etc. The present sensitivity of millimetre interferometers is suitable for a systematic CO search in the brightest sources detected at 0.85 mm by SCUBA. The large gain in sensitivity expected with GBT and particularly with LAMA (LSA/MMA) will allow systematic studies of the initial starbursts of large galaxies.

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