Abstract We present the discovery of a new population of radio quasars. Unlike previously known sources, whose X-ray emission is due to (flat) inverse Compton radiation, these objects are characterized by (steep) synchrotron emission in the X-ray band, with a broad-band spectral energy distribution similar to that of BL Lacs with high energy synchrotron peaks. We discuss how this new class was discovered, the class properties, and the implications of its existence for our understanding of jet physics and active galactic nuclei in general.
Keywords BL Lacertae objects: general -- galaxies: active -- quasars: general -- radiation mechanisms: nonthermal -- radio continuum: galaxies -- X-rays: galaxies
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