Abstract
Abstract Radio-loud quasars (RLQs) are known to produce excess X-ray emission, compared to radio-quiet quasars (RQQs) of the same luminosity, commonly attributed to jet-related emission. Recently, we found that the He ii EW and α ox in RQQs are strongly correlated, which suggests that their extreme-ultraviolet (EUV) and X-ray emission mechanisms are tightly related. Using 48 RLQs, we show that steep-spectrum radio quasars (SSRQs) and low radio-luminosity ( L R ) flat-spectrum radio quasars (FSRQs) follow the α ox – He ii EW relation of RQQs. This suggests that the X-ray and EUV emission mechanisms in these types of RLQs is the same as in RQQs, and is not jet related. High- L R FSRQs show excess X-ray emission given their He ii EW by a factor of ≈3.5, which suggests that only in this type of RLQ is the X-ray production likely jet related.
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