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We report Herschel Spitzer and Wise observations of 44 z=4.8 opticallyselected active galactic nuclei (AGNs). This sample contains the highest massblack holes (BHs) at this redshift. Ten of the objects were detected byHerschel and five show emission that is not associated with the AGNs. The starformation (SF) luminosity (LSF) obtained by fitting the spectral energydistribution (SED) with standard SF templates is in the range 10^(46.62-47.21)erg/s corresponding to SF rates of 1090-4240 Msun/yr. Fitting with luminoussubmillimeter galaxy SEDs gives SF rates that are smaller by 0.05 dex whenusing all bands and 0.1 dex when ignoring the 250-mic band. A 40K gray-bodyfits to only the 500-mic fluxes reduce LSF by about a factor two. Stackinganalysis of 29 undetected sources give significant signals in all three bands.A SF template fit indicates LSF=10^(46.19-46.23) erg/s depending on the assumeAGN contribution. A 40K fit to the stacked 500-mic flux gives LSF=10^(45.95)erg/s. The mean BH mass (mbh) and AGN luminosity (LAGN) of the detected sourcesare significantly higher than those of the undetected ones. The spectraldifferences are seen all the way from UV to far infrared wavelengths. The meanoptical-UV spectra are similar to the ones predicted for thin accretion disksaround BHs with the measured masses and accretion rates. We suggest twoalternative explanations to the correlation of LSF, LAGN and mbh, one involvingno AGN feedback and the second a moderate feedback that affects, but nottotally quench SF in 3/4 of the sources. We compare our LSF and LAGN to lowerredshift samples and show a new correlation between LSF and mbh. We alsoexamine several rather speculative ideas about the host galaxy propertiesincluding the possibility that the detected sources are above the SF masssequence (MS) at z=4.8, perhaps in mergers, and most of the undetected sourcesare on the MS.

Star formation and black hole growth at z=4.8