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We present spectral energy distributions (SEDs) of 69 QSOs at z>5, covering arest frame wavelength range of 0.1mu to ~80mu, and centered on new Spitzer andHerschel observations. The detection rate of the QSOs with Spitzer is very high(97% at lambda_rest ~< 4mu), but drops towards the Herschel bands with 30%detected in PACS (rest frame mid-infrared) and 15% additionally in the SPIRE(rest frame far-infrared; FIR). We perform multi-component SED fits forHerschel-detected objects and confirm that to match the observed SEDs, a clumpytorus model needs to be complemented by a hot (~1300K) component and, in caseswith prominent FIR emission, also by a cold (~50K) component. In the FIRdetected cases the luminosity of the cold component is on the order of 10^13L_sun which is likely heated by star formation. From the SED fits we alsodetermine that the AGN dust-to-accretion disk luminosity ratio declines withUV/optical luminosity. Emission from hot (~1300K) dust is common in our sample,showing that nuclear dust is ubiquitous in luminous QSOs out to redshift 6.However, about 15% of the objects appear under-luminous in the near infraredcompared to their optical emission and seem to be deficient in (but not devoidof) hot dust. Within our full sample, the QSOs detected with Herschel are foundat the high luminosity end in L_UV/opt and L_NIR and show low equivalent widths(EWs) in H_alpha and in Ly_alpha. In the distribution of H_alpha EWs, asdetermined from the Spitzer photometry, the high-redshift QSOs show littledifference to low redshift AGN.

Spectral Energy Distributions of QSOs at z>5: common AGN-heated dust and occasionally strong star-formation