Non-thermal pair model for MeV-blazars

Strong MeV emission in the MeV Blazar sub-class is investigated as evidence of efficient electron-positron pair creation coupled with production of in tense annihilation lines. The X and high energy gamma-ray spectra are produ ced by Inverse Compton scattering of soft accretion disk photons by a relat ivistic non-thermal pair population. The relativistic particles are acceler ated in the inner region of a sub-relativistic electron-proton plasma launc hed from a magnetized accretion disk. As continously re-accelerated the pai rs do not cool, and no thermal pair plasma is expected, Opacity to pair pro duction explains the spectral break observed between X and gamma-ray spectr a. Annihilation of non-thermal pairs explains the MeV excess. Fits of PKS 0 208-512, a well-observed MeV Blazar, are provided. Different sources of var iability mainly associated to transient pair production regimes are propose d to be tested by INTEGRAL.