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An [ITAL]XMM[/ITAL]-[ITAL]Newton[/ITAL] Detection of the [CLC][ITAL]z[/ITAL][/CLC] = 5.80 X-Ray–Weak Quasar SDSS[CLC]p[/CLC] J104433.04-012502.2
We report on an XMM-Newton observation of the most distant known quasar, SDSSp J104433.04-012502.2, at z = 5.80. We have detected this quasar with high significance in the rest-frame 3.4–13.6 keV band, making it the most distant cosmic object detected in X-rays; 32 ± 9 counts were collected. SDSSp J104433.04-012502.2 …