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Costa","submitted_at":"2018-02-15T15:21:44Z","abstract_excerpt":"We present the results from a $\\sim500$ ks Chandra observation of the $z=6.31$ QSO SDSS J1030+0524. This is the deepest X-ray observation to date of a $z\\sim6$ QSO. The QSO is detected with a total of 125 net counts in the full ($0.5-7$ keV) band and its spectrum can be modeled by a single power-law model with photon index of $\\Gamma = 1.81 \\pm 0.18$ and full band flux of $f=3.95\\times 10^{-15}$ erg s$^{-1}$ cm$^{-2}$. When compared with the data obtained by XMM-Newton in 2003, our Chandra observation in 2017 shows a harder ($\\Delta \\Gamma \\approx -0.6$) spectrum and a 2.5 times fainter flux. 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