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We present the broadband analysis of the powerful quasar 4C04.42 (z=0.965)observed by XMM and INTEGRAL. The 0.2--200 keV spectrum is well reproduced witha hard power-law component ($\Gamma\sim$1.2), augmented by a soft componentbelow 2 keV (observer frame), which is described by a thermal blackbody withtemperature kT$\backsimeq$ 0.15 keV. Alternatively, a broken power-law withE$_{break}$=2 keV and $\Delta\Gamma$=0.4 can equally well describe the data.Using archival data we compile the not-simultaneous Spectral EnergyDistribution of the source from radio to gamma-ray frequencies. The SED showstwo main components: the low frequency one produced by Synchrotron radiationfrom the electrons moving in the jet and the high energy one produced throughexternal Compton scattering of the electrons with the photon field of the BroadLine Region. Within this scenario the excess emission in the soft-X ray bandcan be interpreted as due to Bulk Compton radiation of cold electrons. However,some other processes, briefly discussed in the text, can also reproduce theobserved bump.

Bulk Compton motion in the luminous quasar 4C04.42?