The Scuba-Bright Quasar Survey (sbqs):. the Z > 4 Sample

Astronomy and Astrophysics – Astronomy

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Scientific paper

We present initial results of a new, systematic search for indicators of massive star formation in the host galaxies of the most luminous and probably most massive z > 4 radio-quiet quasars (MB ≤ -27.5; νLν(1450A) > 1013L&sun;). Our 850μm survey using SCUBA at the JCMT has been designed with a 3σ = 10mJy flux limit in order to identify sources suitable for follow-up studies of high-redshift star formation using molecular spectral line and continuum diagnostics with existing observing facilities. The program has been running serendipitously in the backup queue for 6 months, taking advantage of the short periods when the atmospheric transmission at zenith is between 60% - 75%. We have detected 8 submillimetre-bright sources (S850μm > 10mJy, from a total of 38 observed) at a significance of 3σ or better. The weighted mean of the flux measured from undetected sources is ~ 2.0 ± 0.6mJy, which we suggest as an underlying fiducial flux for the z > 4 radio-quiet quasar host galaxy population.

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