Millimetre Emission from High Redshift Radioquiet Quasars

The detection at millimetre wavelengths of continuum radiation emitted by dust in high z quasars is favored by the steepness of the far infrared-submm spectrum in the rest frame. About 10 radioquiet quasars at z > 2, the majority of them at z > 4, have now been detected at 1.25mm with the IRAM 30m telescope, with fluxes in the range 3–15 mJy. Millimeter lines of CO are slightly more difficult to detect, but already within the reach of sensitive interferometers for several of these sources. The J = 5–4 line has recently been detected in BR1202–0725 at redshift 4.69