Yang, JinyiJinyiYangFan, XiaohuiXiaohuiFanWang, FeigeFeigeWangLANZUISI, GiorgioGiorgioLANZUISINANNI, RICCARDORICCARDONANNICAPPI, MASSIMOMASSIMOCAPPIChartas, GeorgeGeorgeChartasDADINA, MAUROMAURODADINADECARLI, ROBERTOROBERTODECARLIJin, XiangyuXiangyuJinKeeton, Charles R.Charles R.KeetonVenemans, Bram P.Bram P.VenemansWalter, FabianFabianWalterWang, RanRanWangWu, Xue BingXue BingWuYue, MinghaoMinghaoYueZabludoff, AnnAnnZabludoff2022-03-182022-03-1820222041-8205http://hdl.handle.net/20.500.12386/31702We 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 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 . The derived optical-to-X-ray spectral slope a ox is , suggesting that the X-ray emission of J0439+1634 is weaker by a factor of 18 than the expectation based on its 2500 Å luminosity and the average a ox versus 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 and , assuming a fixed G of 1.9 and a free G, respectively. The intrinsic rest-frame 2-10 keV luminosity is derived as (9.4-15.1) 1043 erg s-1, after correcting for lensing magnification (µ = 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 intrinsically X-ray weak quasar.STAMPAenArticle10.3847/2041-8213/ac45f22-s2.0-85123242963https://iopscience.iop.org/article/10.3847/2041-8213/ac45f2https://api.elsevier.com/content/abstract/scopus_id/85123242963FIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation