Spectral Energy Distributions of QSOs at z>5: common AGN-heated dust and
  occasionally strong star-formation
  We present spectral energy distributions (SEDs) of 69 QSOs at z>5, covering a
rest frame wavelength range of 0.1mu to ~80mu, and centered on new Spitzer and
Herschel 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 for
Herschel-detected objects and confirm that to match the observed SEDs, a clumpy
torus model needs to be complemented by a hot (~1300K) component and, in cases
with prominent FIR emission, also by a cold (~50K) component. In the FIR
detected cases the luminosity of the cold component is on the order of 10^13
L_sun which is likely heated by star formation. From the SED fits we also
determine that the AGN dust-to-accretion disk luminosity ratio declines with
UV/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 infrared
compared to their optical emission and seem to be deficient in (but not devoid
of) hot dust. Within our full sample, the QSOs detected with Herschel are found
at 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, as
determined from the Spitzer photometry, the high-redshift QSOs show little
difference to low redshift AGN.
