论文标题
SRG/Erosita在Z> 6处发现最多的X射线发光类星体
SRG/eROSITA uncovers the most X-ray luminous quasar at z>6
论文作者
论文摘要
我们报告了CFHQS J142952+544717的X射线发射，这是2019年12月10日，Z = 6.18的最遥远的已知无线电大声，Z = 6.18，在其正在进行的全厚度调查过程中，Erosita望远镜在SRG卫星上与Erosita望远镜一起。通过将中间SRG/Erosita源目录与Pan-Starrs1远距离类型样品进行交叉匹配，以5.6 <Z <6.7进行交叉匹配。 The measured flux $\sim 8 \times 10^{-14}$ erg cm$^{-2}$ s$^{-1}$ in the 0.3--2 keV energy band corresponds to an X-ray luminosity of $2.6^{+1.7}_{-1.0}\times 10^{46}$ erg s$^{-1}$ in the 2--10 keV REST-FRAME能量频带，它呈现CFHQS J142952+544717在Z> 6中观察到的最X射线发光的Quasar。将我们的X射线测量结果与其他波段中的档案和新的光度测量结合在一起（无线电至光学），我们估算了该Quastric simbormote simbormote simbormote sime quasormote time time time time time time time time time at $ $ - $ 3 $ - 10^{47} $ erg s $^{ - 1} $。假设Eddington有限积聚和各向同性发射，我们推断出$ \ sim 2 \ sim 10^9 m_ \ odot $的超质量黑洞的质量下限。 CFHQS J142952+544717的最显着特征是相对于光学/UV发射的X射线亮度。我们认为它可能与其无线电呈链接（尽管根据其无线电特性，该物体不是大型的），特别是对宇宙微波背景光子的反向康普顿散射的贡献。如果是这样，CFHQS J142952+544717可能是具有增强X射线发射的高Z类星体冰山一角，而SRG/Erosita可能会在其4年的全天候调查中找到更多此类对象。
We report the discovery of X-ray emission from CFHQS J142952+544717, the most distant known radio-loud quasar at z=6.18, on Dec. 10--11, 2019 with the eROSITA telescope on board the SRG satellite during its ongoing all-sky survey. The object was identified by cross-matching an intermediate SRG/eROSITA source catalog with the Pan-STARRS1 distant quasar sample at 5.6 < z < 6.7. The measured flux $\sim 8 \times 10^{-14}$ erg cm$^{-2}$ s$^{-1}$ in the 0.3--2 keV energy band corresponds to an X-ray luminosity of $2.6^{+1.7}_{-1.0}\times 10^{46}$ erg s$^{-1}$ in the 2--10 keV rest-frame energy band, which renders CFHQS J142952+544717 the most X-ray luminous quasar ever observed at z > 6. Combining our X-ray measurements with archival and new photometric measurements in other wavebands (radio to optical), we estimate the bolometric luminosity of this quasar at $\sim (2$--$3) \times 10^{47}$ erg s$^{-1}$. Assuming Eddington limited accretion and isotropic emission, we infer a lower limit on the mass of the supermassive black hole of $\sim 2\times 10^9 M_\odot$. The most salient feature of CFHQS J142952+544717 is its X-ray brightness relative to the optical/UV emission. We argue that it may be linked to its radio-loudness (although the object is not a blazar according to its radio properties), specifically to a contribution of inverse Compton scattering of cosmic microwave background photons off relativistic electrons in the jets. If so, CFHQS J142952+544717 might be the tip of the iceberg of high-z quasars with enhanced X-ray emission, and SRG/eROSITA may find many more such objects during its 4 year all-sky survey.
