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 kiloparsec scale at z ≳ 6. Modeling the X-ray spectrum of the quasar with a power law, we find a best fit of , leading to an X-ray luminosity of and an X-ray to UV brightness ratio of α _OX = −1.45 −0.11. We identify a diffuse structure 50 kpc (∼8″) 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 ∼ 10⁴⁴ erg 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.″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.

我们展示了 PSO J352.4034−15.3373 的深度 (265 ks) 钱德拉 X 射线观测，这是一个z = 5.831的类星体，其射电光通量比R > 1000，是射电最响的类星体之一在早期宇宙中，并且是唯一在z ≳ 6处观测到千秒差距尺度的扩展射电喷流的类星体。用幂律对类星体的 X 射线光谱进行建模，我们找到了 的最佳拟合，导致 X 射线光度的和X射线到的UV亮度比α _OX = -1.45 -0.11。我们确定了一个漫射结构 50 kpc (∼8") 到类星体 NW 沿喷射轴对应于 3 σ发射角密度的增强，可以排除背景波动，概率为P = 0.9985。虽然检测到的光子很少，结构的光谱拟合是不确定的，但我们发现它的光度为L _2–10 ∼ 10 ⁴⁴ erg 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。我们没有发现过量 X 射线发射的证据，在那里可以看到先前报道的射电射流（其整体线性范围为 0.″28），并且发现了沿射流轴到 SE 的明亮 X 射线点源通过光学和近红外成像与类星体无关。