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The SCUBA Bright Quasar Survey (SBQS): 850-micron observations of the z >~ 4 Sample

Isaak, Kate Gudrun, Priddey, Robert S., McMahon, Richard G., Omont, Alain, Peroux, Celine, Sharp, Robert G. and Withington, Stafford 2002. The SCUBA Bright Quasar Survey (SBQS): 850-micron observations of the z >~ 4 Sample. Monthly notices of the Royal Astronomical Society 329 , pp. 149-162. 10.1046/j.1365-8711.2002.04966.x

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We present initial results of a new, systematic search for massive star formation in the host galaxies of the most luminous and probably most massive radio-quiet quasars . The survey, undertaken at 850 μm using SCUBA at the James Clerk Maxwell Telescope (JCMT), has a target sensitivity limit of , set to identify sources suitable for detailed follow-up, e.g. continuum mapping and molecular line diagnostics. A total of 38 radio-quiet quasars have been observed at 850 μm, of which eight were detected (>3σ) with (submillimetre-loud). The new detections almost triple the number of optically selected, submillimetre-loud radio-quiet quasars known to date. We include a detailed description of how our quasar sample is defined in terms of radio and optical properties. As a by-product of our selection procedure, we have identified 17 radio-loud quasars with . There is no strong evidence for trends in either detectability or 850-μm flux with absolute magnitude, MB. We find that the weighted mean flux of the undetected sources is , consistent with an earlier estimate of ∼3 mJy based on more sensitive observations of a sample radio-quiet quasars. This corresponds to an inferred star formation rate of ∼1000 M⊙ yr−1, similar to Arp220. The typical star formation time-scale for the submillimetre-bright sources is ∼1 Gyr, 10 times longer than the typical accretion-driven e-folding time-scale of ∼ . Our 850-μm detection of the quasar PSS J1048+4407, when analysed in conjunction with 1.2-mm single-dish and interferometric observations, suggests that this source is resolved on angular scales of . In addition, we present a new optical spectrum of this source, identifying it as a broad absorption line (BAL) quasar. The new redshift is outside that covered in a recent CO line search, highlighting the need for accurate redshifts for the observation and interpretation of high-redshift line studies.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Uncontrolled Keywords: Dust, extinction ; Quasars: general ; Galaxies: starburst ; Cosmology: observations ; Infrared: galaxies
ISSN: 0035-8711
Last Modified: 19 Mar 2016 22:03

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