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 () flat-spectrum radio quasars (FSRQs) follow the – 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- 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.

已知无线电响亮类星体 (RLQ) 会产生过多的 X 射线发射，而具有相同光度的无线电安静类星体 (RQQ) 通常归因于与喷射相关的发射。最近，我们发现 RQQs 中的 He  ii EW 和α _ox具有很强的相关性，这表明它们的极紫外 (EUV) 和 X 射线发射机制密切相关。使用 48 个 RLQ，我们表明陡谱射电类星体 (SSRQ) 和低射电光度 ( ) 平谱射电类星体 (FSRQ) 遵循 RQQ 的- He  ii EW 关系。这表明这些类型的 RLQ 中的 X 射线和 EUV 发射机制与 RQQ 中的相同，并且与射流无关。鉴于其 He，高FSRQ 显示出过多的 X 射线发射 ii EW 因子≈3.5，这表明只有在这种类型的 RLQ 中，X 射线的产生可能与喷流有关。