论文标题
XMM-NEWTON极度X射线发光的类星体CFHQS J142952+544717 = SRGE J142952.1+544716 REDSHIFT Z = 6.18
XMM-Newton observations of the extremely X-ray luminous quasar CFHQS J142952+544717=SRGE J142952.1+544716 at redshift z=6.18
论文作者
论文摘要
我们介绍了20 km xmm-newton ddt观察到Z = 6.18时的放射载载量子CFHQS J142952+544717的结果，最近在其首次全套小型调查的过程中，SRG/Erosita望远镜最近揭示了其极端的X射线光度。在0.2-10 kev Energy Band中，总共可以自信地检测到类星体（在对象的休息框架中1.4至72 KEV）中。它的测量光谱异常柔软，可以通过吸收的幂律模型来描述，其光子指数为$γ= 2.5 \ pm0.2 $。没有迹象表明高能量截止或反射成分，荧光铁K $α$等效宽度为$ \ 290 $ eV的上限为90％，并且对铁K边缘吸收深度的相应上限为0.6。我们已经在$> 95 \％$置信度下检测到超过银河值的多余吸收水平，对应于列密度$ n_h = 3 \ pm2 \ pm2 \ times 10^{22} $ cm $^{ - 2} $位于z = 6.18的材料的材料。发现CFHQS J142952+544717在1.4至72 keV Energy带中的固有光度为$ 5.5 _ { - 0.6}^{+0.8} \ times 10^{46} $ erg S $^{-1} $。我们没有检测到两次SRG扫描和XMM-Newton观察之间的统计学上显着的通量变化，超过$ \ sim 7.5 $ 7.5美元，这意味着Quasar至少在其休息框架中至少保持了一个非常高的光度水平。我们提出了以下假设：CFHQS J142952+544717的极端X射线特性与宇宙微波背景光子的逆康普顿散射（Z = 6.18）相关。
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.
