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Many theoretical models require powerful active galactic nuclei (AGNs) tosuppress star formation in distant galaxies and reproduce the observedproperties of today's massive galaxies. A recent study based on Herschel-SPIREsubmillimetre observations claimed to provide direct support for this picture,reporting a significant decrease in the mean star-formation rates (SFRs) of themost luminous AGNs (Lx>10^44 erg/s) at z=1-3 in the Chandra Deep Field-North(CDF-N). In this letter we extend these results using Herschel-SPIRE 250um datain the COSMOS and CDF-S fields to achieve an order of magnitude improvement inthe number of sources at Lx>10^44 erg/s. On the basis of our analysis, we findno strong evidence for suppressed star formation in Lx>10^44 erg/s AGNs atz=1-3. The mean SFRs of the AGNs are constant over the broad X-ray luminosityrange of Lx~10^43-10^45 erg/s (with mean SFRs consistent with typicalstar-forming galaxies at z~2; <SFRs>~100-200 Msol/yr). We suggest that theprevious CDF-N results were likely due to low number statistics. We discuss ourresults in the context of current theoretical models.

No clear submillimetre signature of suppressed star formation amongst X-ray luminous AGNs