The aox–HeII EW Connection in Radio-Loud Quasars. (arXiv:2104.14407v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Timlin_J/0/1/0/all/0/1">John D. Timlin III</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhu_S/0/1/0/all/0/1">Shifu Zhu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Brandt_W/0/1/0/all/0/1">W. Niel Brandt</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Laor_A/0/1/0/all/0/1">Ari Laor</a>
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 HeII EW and
$alpha_{rm{ox}}$ 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 ($L_{rm R}$) flat-spectrum radio quasars (FSRQs) follow the
$alpha_{rm ox}$–HeII 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-$L_{rm R}$ FSRQs show excess X-ray emission given their
HeII EW by a factor of $approx$ 3.5, which suggests that only in this type of
RLQ is the X-ray production likely jet related.
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 HeII EW and
$alpha_{rm{ox}}$ 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 ($L_{rm R}$) flat-spectrum radio quasars (FSRQs) follow the
$alpha_{rm ox}$–HeII 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-$L_{rm R}$ FSRQs show excess X-ray emission given their
HeII EW by a factor of $approx$ 3.5, which suggests that only in this type of
RLQ is the X-ray production likely jet related.
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