Fig. 7.
Simple scheme comparing the sensitivity ranges of the RASS and the OUSXG surveys at ∼1 keV to the SED of different types of HBL blazars with radio flux density of 3 mJy, close to the sensitivity limit of existing radio surveys. Blazars of this radio flux-density and νpeak ≲ 1016 Hz can only be detected in the OUSXG survey and are therefore missing in catalogues that require detection in the RASS.
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