We report the Suzaku observations of the high luminosity blazar SWIFT J0746.3+2548 ( J0746 ) conducted in November 2005 .
This object , with z = 2.979 , is the highest redshift source observed in the Suzaku Guaranteed Time Observer ( GTO ) period , is likely to show high gamma-ray flux peaking in the MeV range .
As a result of the good photon statistics and high signal-to-noise ratio spectrum , the Suzaku observation clearly confirms that J0746 has an extremely hard spectrum in the energy range of 0.3–24 keV , which is well represented by a single power-law with a photon index of \Gamma _ { ph } \simeq 1.17 and Galactic absorption .
The multiwavelength spectral energy distribution of J0746 shows two continuum components , and is well modeled assuming that the high-energy spectral component results from Comptonization of the broad-line region photons .
In this paper we search for the bulk Compton spectral features predicted to be produced in the soft X-ray band by scattering external optical/UV photons by cold electrons in a relativistic jet .
We discuss and provide constraints on the pair content resulting from the apparent absence of such features .