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We present a deep XMM-Newton observation of the z=6.30 QSO SDSS J1030+0524,the second most distant quasar currently known. The data contain sufficientcounts for spectral analysis, demonstrating the ability of XMM-Newton tomeasure X-ray spectral shapes of z~6 QSOs with integration times >100ks. TheX-ray spectrum is well fit by a power law with index Gamma=2.12 +/- 0.11, anoptical-X-ray spectral slope of a_{ox}=-1.80, and no absorption excess to theGalactic value, though our data are also consistent with a power law index inthe range 2.02 < Gamma < 2.5 and excess absorption in the range 0 < N_H(cm^-2)< 8x10^22. There is also a possible detection (2 sigma) of FeKa emission. TheX-ray properties of this QSO are, overall, similar to those of lower-redshiftradio-quiet QSOs. This is consistent with the statement that the X-rayproperties of radio-quiet QSOs show no evolution over 0<z<6.3. Combined withprevious results, this QSO appears indistinguishable in any way from lowerredshift QSOs, indicating that QSOs comparable to those seen locally existedless than one Gyr after the Big Bang.Comment: ApJ Letters, accepte

The X-Ray Spectrum of the z = 6.30 QSO SDSS J1030+0524