arXiv 2103.038792021-03-05astro-ph.GAastro-ph.HE

在宇宙的第一个十亿年中，来自最具射电能量的类星体的增强X射线发射

Enhanced X-ray Emission from the Most Radio-Powerful Quasar in the Universe's First Billion Years

Thomas Connor, Eduardo Bañados, Daniel Stern, Chris Carilli, Andrew Fabian, Emmanuel Momjian, Sofía Rojas-Ruiz, Roberto Decarli, Emanuele Paolo Farina, Chiara M… 展开作者

Thomas Connor, Eduardo Bañados, Daniel Stern, Chris Carilli, Andrew Fabian, Emmanuel Momjian, Sofía Rojas-Ruiz, Roberto Decarli, Emanuele Paolo Farina, Chiara Mazzucchelli, Hannah P. Earnshaw

备注：: 16 pages, 7 Figures. Accepted for publication the Astrophysical Journal
DOI：: 10.3847/1538-4357/abe710

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摘要：

我们对PSO J352.4034 $-$ 15.3373进行了深度（265 ks）Chandra X射线观测，PSO J352.4034 $-$ 15.3373是一个z=5.831的类星体，其射电与光通量比R>1000，是早期宇宙中射电最响亮的类星体之一，也是唯一一个在$z \gtrsim 6$观测到kpc尺度扩展射电喷流的类星体。用幂律模型模拟类星体的X射线光谱，我们发现$Γ= 1.99^{+0.29}_{-0.28}$的最佳拟合，导致$L_{2-10} = 1.26^{+0.45}_{-0.33} \times 10^{45}\ {\rm erg}\ {\rm s}^{-1}$的X射线亮度和X射线与紫外亮度比为$α_{\rm OX} = -1.36 \pm 0.11$。我们确定了一个扩散结构50千秒差距（${\sim}8^{\prime\prime}$）的NW的类星体沿喷流轴，对应于一个$3σ$增强发射的角密度，可以排除作为一个背景波动的概率P=0.9985。虽然很少检测到的光子的光谱适合的结构是不确定的，我们发现，它有一个光度$L_{2-10}\sim10^{44}\ {\rm erg}\ {\rm s}^{-1}$。因此，这些观测结果可能代表了迄今为止在X射线中看到的最遥远的类星体喷流。我们没有发现任何证据表明，过量的X射线发射的地方，以前报道的无线电喷流被视为（其中有一个整体的线性范围$0.^{\prime\prime}28$），和一个明亮的X射线点源位于沿喷流轴的SE被揭示的光学和近红外成像与类星体无关。

英文摘要：

We present deep (265 ks) Chandra X-ray observations of PSO J352.4034$-$15.3373, a quasar at z=5.831 that, with a radio-to-optical flux ratio of R>1000, is one of the radio-loudest quasars in the early universe and is the only quasar with observed extended radio jets of kpc-scale at $z \gtrsim 6$. Modeling the X-ray spectrum of the quasar with a power law, we find a best fit of $Γ= 1.99^{+0.29}_{-0.28}$, leading to an X-ray luminosity of $L_{2-10} = 1.26^{+0.45}_{-0.33} \times 10^{45}\ {\rm erg}\ {\rm s}^{-1}$ and an X-ray to UV brightness ratio of $α_{\rm OX} = -1.36 \pm 0.11$. We identify a diffuse structure 50 kpc (${\sim}8^{\prime\prime}$) to the NW of the quasar along the jet axis that corresponds to a $3σ$ enhancement in the angular density of emission and can be ruled out as a background fluctuation with a probability of P=0.9985. While with few detected photons the spectral fit of the structure is uncertain, we find that it has a luminosity of $L_{2-10}\sim10^{44}\ {\rm erg}\ {\rm s}^{-1}$. These observations therefore potentially represent the most distant quasar jet yet seen in X-rays. We find no evidence for excess X-ray emission where the previously-reported radio jets are seen (which have an overall linear extent of $0.^{\prime\prime}28$), and a bright X-ray point source located along the jet axis to the SE is revealed by optical and NIR imaging to not be associated with the quasar.

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