Symeonidis, MyrtoMaddox, NatashaJarvis, Matthew J.2022-08-032022-08-032022Symeonidis, M. et al. (2022). The star formation rates of QSOs. Monthly Notices of the Royal Astronomical Society, 514(3), 4450-4464. 10.1093/mnras/stac13591365-296610.1093/mnras/stac1359http://hdl.handle.net/10566/7661We examine the far-IR properties of a sample of 5391 optically selected QSOs in the 0.5 < z < 2.65 redshift range down to log [νLν,2500(erg/s)] > 44.7, using SPIRE data from Herschel-ATLAS. We split the sample in a grid of 74 luminosity-redshift bins and compute the average optical–infrared spectral energy distribution (SED) in each bin. By normalising an intrinsic AGN template to the AGN optical power (at 5100˚A) we decompose the total infrared emission (LIR; 8—1000µm) into an AGN (LIR,AGN) and star-forming component (LIR,SF). We find that the AGN contribution to LIR increases as a function of AGN power which manifests as a reduction of the ‘far-IR bump’ in the average QSO SEDs. We note that LIR,SF does not correlate with AGN power; the mean star formation rates (SFRs) of AGN host galaxies are a function of redshift only and they range from ∼6 M⊙/yr at z ∼ 0 to a plateau of . 200 M⊙/yr at z ∼ 2.6.enAstrophysicsRedshiftNuclearAGN powerArticle