%0 Generic %1 connor2021enhanced %A Connor, Thomas %A Bañados, Eduardo %A Stern, Daniel %A Carilli, Chris %A Fabian, Andrew %A Momjian, Emmanuel %A Rojas-Ruiz, Sofía %A Decarli, Roberto %A Farina, Emanuele Paolo %A Mazzucchelli, Chiara %A Earnshaw, Hannah P. %D 2021 %K library %T Enhanced X-ray Emission from the Most Radio-Powerful Quasar in the Universe's First Billion Years %U http://arxiv.org/abs/2103.03879 %X 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 $\Gamma = 1.99^+0.29_-0.28$, leading to an X-ray luminosity of $L_2-10 = 1.26^+0.45_-0.33 10^45\ erg\ s^-1$ and an X-ray to UV brightness ratio of $\alpha_OX = -1.36 0.11$. We identify a diffuse structure 50 kpc ($\sim8^\prime\prime$) to the NW of the quasar along the jet axis that corresponds to a $3\sigma$ 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 $L_2-10\sim10^44\ erg\ s^-1$. 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 $0.^\prime\prime28$), 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.

@misc{connor2021enhanced, abstract = {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 $\Gamma = 1.99^{+0.29}_{-0.28}$, 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 $\alpha_{\rm OX} = -1.36 \pm 0.11$. 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 $3\sigma$ 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.}, added-at = {2021-03-09T06:35:34.000+0100}, author = {Connor, Thomas and Bañados, Eduardo and Stern, Daniel and Carilli, Chris and Fabian, Andrew and Momjian, Emmanuel and Rojas-Ruiz, Sofía and Decarli, Roberto and Farina, Emanuele Paolo and Mazzucchelli, Chiara and Earnshaw, Hannah P.}, biburl = {https://www.bibsonomy.org/bibtex/27fb8ea90d6b24784c141a8c5b6ff1a96/gpkulkarni}, description = {Enhanced X-ray Emission from the Most Radio-Powerful Quasar in the Universe's First Billion Years}, interhash = {899fb1bb0588db4135c5e91498ae7a62}, intrahash = {7fb8ea90d6b24784c141a8c5b6ff1a96}, keywords = {library}, note = {cite arxiv:2103.03879Comment: 16 pages, 7 Figures. Accepted for publication the Astrophysical Journal}, timestamp = {2021-03-09T06:35:34.000+0100}, title = {Enhanced X-ray Emission from the Most Radio-Powerful Quasar in the Universe's First Billion Years}, url = {http://arxiv.org/abs/2103.03879}, year = 2021 }