%0 Generic %1 yang2021xmmnewton %A Yang, Jinyi %A Fan, Xiaohui %A Wang, Feige %A Lanzuisi, Giorgio %A Nanni, Riccardo %A Cappi, Massimo %A Chartas, George %A Dadina, Mauro %A Decarli, Roberto %A Jin, Xiangyu %A Keeton, Charles R. %A Venemans, Bram P. %A Walter, Fabian %A Wang, Ran %A Wu, Xue-Bing %A Yue, Minghao %A Zabludoff, Ann %D 2021 %K library %T Deep XMM-Newton Observations of an X-ray Weak, Broad Absorption Line Quasar at $z=6.5$ %U http://arxiv.org/abs/2112.10785 %X We report X-ray observations of the most distant known gravitationally lensed quasar, J0439+1634 at $z=6.52$, which is also a broad absorption line (BAL) quasar, using the XMM-Newton Observatory. With a 130 ks exposure, the quasar is significantly detected as a point source at the optical position with a total of 358$^+19_-19$ net counts using the EPIC instrument. By fitting a power-law plus Galactic absorption model to the observed spectra, we obtain a spectral slope of $\Gamma=1.45^+0.10_-0.09$. The derived optical-to-X-ray spectral slope $\alpha_ox$ is $-2.07^+0.01_-0.01$, suggesting that the X-ray emission of J0439+1634 is weaker by a factor of 18 than the expectation based on its 2500 Angstrom luminosity and the average $\alpha_ox$ vs. luminosity relationship. This is the first time that an X-ray weak BAL quasar at $z>6$ has been observed spectroscopically. Its X-ray weakness is consistent with the properties of BAL quasars at lower redshift. By fitting a model including an intrinsic absorption component, we obtain intrinsic column densities of $N_H=2.8^+0.7_-0.6\times10^23\,cm^-2$ and $N_H= 4.3^+1.8_-1.5\times10^23\,cm^-2$, assuming a fixed $\Gamma$ of 1.9 and a free $\Gamma$, respectively. The intrinsic rest-frame 2--10 keV luminosity is derived as $(9.4-15.1)\times10^43\,erg\,s^-1$, after correcting for lensing magnification ($\mu=51.3$). The absorbed power-law model fitting indicates that J0439+1634 is the highest redshift obscured quasar with a direct measurement of the absorbing column density. The intrinsic high column density absorption can reduce the X-ray luminosity by a factor of $3-7$, which also indicates that this quasar could be a candidate of intrinsically X-ray weak quasar.

@misc{yang2021xmmnewton, abstract = {We report X-ray observations of the most distant known gravitationally lensed quasar, J0439+1634 at $z=6.52$, which is also a broad absorption line (BAL) quasar, using the XMM-Newton Observatory. With a 130 ks exposure, the quasar is significantly detected as a point source at the optical position with a total of 358$^{+19}_{-19}$ net counts using the EPIC instrument. By fitting a power-law plus Galactic absorption model to the observed spectra, we obtain a spectral slope of $\Gamma=1.45^{+0.10}_{-0.09}$. The derived optical-to-X-ray spectral slope $\alpha_{\rm{ox}}$ is $-2.07^{+0.01}_{-0.01}$, suggesting that the X-ray emission of J0439+1634 is weaker by a factor of 18 than the expectation based on its 2500 Angstrom luminosity and the average $\alpha_{\rm{ox}}$ vs. luminosity relationship. This is the first time that an X-ray weak BAL quasar at $z>6$ has been observed spectroscopically. Its X-ray weakness is consistent with the properties of BAL quasars at lower redshift. By fitting a model including an intrinsic absorption component, we obtain intrinsic column densities of $N_{\rm{H}}=2.8^{+0.7}_{-0.6}\times10^{23}\,\rm{cm}^{-2}$ and $N_{\rm{H}}= 4.3^{+1.8}_{-1.5}\times10^{23}\,\rm{cm}^{-2}$, assuming a fixed $\Gamma$ of 1.9 and a free $\Gamma$, respectively. The intrinsic rest-frame 2--10 keV luminosity is derived as $(9.4-15.1)\times10^{43}\,\rm{erg\,s}^{-1}$, after correcting for lensing magnification ($\mu=51.3$). The absorbed power-law model fitting indicates that J0439+1634 is the highest redshift obscured quasar with a direct measurement of the absorbing column density. The intrinsic high column density absorption can reduce the X-ray luminosity by a factor of $3-7$, which also indicates that this quasar could be a candidate of intrinsically X-ray weak quasar.}, added-at = {2021-12-22T04:26:16.000+0100}, author = {Yang, Jinyi and Fan, Xiaohui and Wang, Feige and Lanzuisi, Giorgio and Nanni, Riccardo and Cappi, Massimo and Chartas, George and Dadina, Mauro and Decarli, Roberto and Jin, Xiangyu and Keeton, Charles R. and Venemans, Bram P. and Walter, Fabian and Wang, Ran and Wu, Xue-Bing and Yue, Minghao and Zabludoff, Ann}, biburl = {https://www.bibsonomy.org/bibtex/22f0a10efc56384db47c56e06c47dcd47/gpkulkarni}, description = {Deep XMM-Newton Observations of an X-ray Weak, Broad Absorption Line Quasar at $z=6.5$}, interhash = {7c37de80980de18174d5ca40d6e883ce}, intrahash = {2f0a10efc56384db47c56e06c47dcd47}, keywords = {library}, note = {cite arxiv:2112.10785Comment: 8 pages, 3 figures, 1 table; Accepted for publication in ApJL}, timestamp = {2021-12-22T04:26:16.000+0100}, title = {Deep XMM-Newton Observations of an X-ray Weak, Broad Absorption Line Quasar at $z=6.5$}, url = {http://arxiv.org/abs/2112.10785}, year = 2021 }