红移z=6.18的极X射线发光类星体CFHQS J142952 +544717= SRGE J142952 .1+544716的XMM-牛顿观测
XMM-Newton observations of the extremely X-ray luminous quasar CFHQS J142952+544717=SRGE J142952.1+544716 at redshift z=6.18
摘要：
我们目前的结果，从20 ksXMM牛顿DDT观测的射电负载类星体CFHQS J142952+544717在z=6.18，其极端的X射线光度最近透露的SRG/eROSITA望远镜在其第一次全天巡天的过程中。类星体已经被确信地探测到，在0.2-10 keV能带（在物体的静止坐标系中为1.4至72 keV）中总共有$\sim 1400$净计数。它的测量光谱异常柔软，可以用光子指数为$Γ= 2.5\pm0.2$的吸收幂律模型来描述。没有高能量截止或反射分量的迹象，其中荧光铁K $α$等效宽度的90%上限为$\approx 290$ eV，铁K边吸收深度的相应上限为0.6。我们已经检测到，在$> 95\%$置信水平，超过银河值的过量吸收，对应于位于z=6.18的材料的柱密度$N_H= 3\pm2 \times 10^{22}$ cm $^{-2}$。CFHQS J142952+544717在1.4 - 72 keV能带的本征光度为$5.5_{-0.6}^{+0.8} \times 10^{46}$ erg s $^{-1}$。我们在两次SRG扫描和XMM-牛顿观测之间没有检测到统计学上显著的通量变化，跨越了$\sim 7.5$个月，这意味着类星体在其静止帧中至少保持了一个月的极高光度水平。提出了CFHQS J142952+544717的极端X射线性质与其相对论喷流中宇宙微波背景光子（z=6.18）的逆康普顿散射有关的假设。
英文摘要：
We present results from a 20 ks XMM-Newton DDT observation of the radio-load quasar CFHQS J142952+544717 at z=6.18, whose extreme X-ray luminosity was recently revealed by the SRG/eROSITA telescope in the course of its first all-sky survey. The quasar has been confidently detected with a total of $\sim 1400$ net counts in the 0.2-10 keV energy band (1.4 to 72 keV in the object's rest frame). Its measured spectrum is unusually soft and can be described by an absorbed power-law model with a photon index of $Γ= 2.5\pm0.2$. There are no signs of a high-energy cutoff or reflected component, with an 90 % upper limit on the fluorescence iron K$α$ equivalent width of $\approx 290$ eV and the corresponding upper limit on the iron K-edge absorption depth of 0.6. We have detected, at the $> 95\%$ confidence level, an excess absorption above the Galactic value, corresponding to a column density $N_H= 3\pm2 \times 10^{22}$ cm$^{-2}$ of material located at z=6.18. The intrinsic luminosity of CFHQS J142952+544717 in the 1.4 to 72 keV energy band is found to be $5.5_{-0.6}^{+0.8} \times 10^{46}$ erg s$^{-1}$. We did not detect statistically significant flux changes between two SRG scans and the XMM-Newton observation, spanning over $\sim 7.5$ months, implying that the quasar remained at this extremely high luminosity level for at least a month in its rest frame. We put forward the hypothesis that the extreme X-ray properties of CFHQS J142952+544717 are associated with inverse Compton scattering of cosmic microwave background photons (at z=6.18) in its relativistic jets.
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