Mon. Not. R. Astron. Soc., 351, 676-684 (2004/June-3)
Submillimetre photometry of typical high-redshift radio quasars.
RAWLINGS S., WILLOTT C.J., HILL G.J., ARCHIBALD E.N., DUNLOP J.S. and HUGHES D.H.
Abstract (from CDS):
We present Submillimetre Common-User Bolometer Array (SCUBA) photometry of a sample of eight high-redshift (2.5 ≤z < 3.5) radio quasars from two redshift surveys: the TexOx-1000 (or TOOT) Survey and the 7C Redshift Survey (7CRS). Unlike the powerful high-redshift radio sources observed previously in the submillimetre, these radio sources are typical of those dominating the radio luminosity density of the population. We detect just two of the TOOT/7CRS targets at 850 µm, and one of these detections is probably due to synchrotron emission rather than dust. The population represented by the other six objects is detected in a statistical sense with their average 850-µm flux density implying that they are similar to low-redshift, far-infrared luminous quasars undergoing at most moderate (≲200 M☉/yr) starbursts. By considering all the SCUBA data available for radio sources, we conclude that positive correlations between rest-frame far-infrared luminosity LFIR, 151-MHz luminosity L151and redshift z, although likely to be present, are hard to interpret because of subtle selection and classification biases, small number statistics and uncertainties concerning synchrotron contamination and k-correction. We argue that there is not yet any compelling evidence for significant differences in the submillimetre properties of radio-loud and radio-quiet quasars at high redshift.
galaxies: active - galaxies: evolution - galaxies: formation - galaxies: jets - galaxies: luminosity function, mass function
Table 1: TONS HH NNNN N=5.
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