Abstract
The average X-ray spectra, and the levels of X-ray luminosity relative to the luminosity in lower-energy radiation, are discussed for 3 classes of compact flat-spectrum radio sources: (a) radio-selected BL Lac objects, (b), Highly Polarized QSOs, and (c) QSOs with lower polarization. The conclusions are as follows. First, the X-ray spectra do not support a unified ‘Blazar’ class made from HPQs and radio-selected BL Lac Objects — the BL Lac objects have a mean X-ray spectral energy index, α, of ≈ 1.0, whereas both QSO classes have α ≈ 0.5. Second, the QSOs display an X-ray-luminosity `excess' over average extrapolations from lower energies. Third, the radio-selected BL Lac objects are, on average, consistent in 2 keV luminosity with an extrapolation from lower energies, but the average measured X-ray spectrum is flatter than this extrapolation would suggest.
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