论文标题
3CRR类星体的复合X射线频谱
The composite X-ray spectrum of 3CRR Quasars
论文作者
论文摘要
尚不清楚Radio-Loud类星体（RLQ）和射电优分类星体（RQQS）之间复合X射线频谱差异的原因尚不清楚。为了研究这种差异，我们通过使用Chandra X射线数据和Sloan Digital Sky Survey（SDSS）光学数据来构建了RLQ的新复合X射线谱，以进行3CRR类星体样本。我们发现除3C 351外，所有3CRR类星体的X射线光谱没有软X射线过量，并且可以很好地安装吸收的幂律模型。对于RLQ，我们的复合X射线频谱与\ cite {shangetal2011apjs}相似，与RQQ的复合X射线频谱相比，显示更高的硬X射线和更低的软X射线通量。大多数类似Blazar的3CRR类星品的X射线通量都比中位复合X射线频谱高，这可能与X射线频带的光束喷射发射的贡献有关。从文献中，我们发现19个3crr类星体已经扩展了与无线电飞机相关的X射线发射，表明X射线频段的喷气机不可避免地贡献。与RQQ相比，3CRR类星体的X射线光子指数与Eddington比率无关。我们的结果表明，RLQ中X射线带的射流发射可能与RLQ和RQQ之间的复合X射线频谱的差异有关。
The reason for the difference in the composite X-ray spectrum between radio-loud quasars (RLQs) and radio-quiet quasars (RQQs) is still unclear. To study this difference, we built a new composite X-ray spectrum of RLQs by using Chandra X-ray data and Sloan Digital Sky Survey (SDSS) optical data for the sample of 3CRR quasars. We find the X-ray spectra of all 3CRR quasars except for 3C 351 have no soft X-ray excess and can be fitted with an absorbed power-law model well. Our composite X-ray spectrum is similar to that of \cite{ShangEtal2011apjs} for RLQs, showing higher hard X-ray and lower soft X-ray flux than the composite X-ray spectrum of RQQs. Most blazar-like 3CRR quasars have higher X-ray flux than the median composite X-ray spectrum, which could be related to the contribution of beamed jet emission at X-ray band. From the literature, we find that nineteen 3CRR quasars have extended X-ray emission related to radio jets, indicating inevitable contribution of jets at X-ray band. In contrast to RQQs, the X-ray photon index of 3CRR quasars does not correlate with the Eddington ratio. Our results suggest that the jet emission at X-ray band in RLQs could be related with the difference of composite X-ray spectrum between RLQs and RQQs.
