The X-ray spectrum of the z = 6.30 QSO SDSS J1030+0524

Jun, 2004
Published in:
  • Astrophys.J.Lett. 611 (2004) L13-L16
e-Print:

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Abstract: (arXiv)
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 sufficient counts for spectral analysis, demonstrating the ability of XMM-Newton to measure X-ray spectral shapes of z~6 QSOs with integration times >100ks. The X-ray spectrum is well fit by a power law with index Gamma=2.12 +/- 0.11, an optical-X-ray spectral slope of a_{ox}=-1.80, and no absorption excess to the Galactic value, though our data are also consistent with a power law index in the 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. The X-ray properties of this QSO are, overall, similar to those of lower-redshift radio-quiet QSOs. This is consistent with the statement that the X-ray properties of radio-quiet QSOs show no evolution over 0
  • cosmology: observations
  • galaxies: formation
  • galaxies: high-redshift
  • quasars: individual (SDSS J1030+0524)
  • X-rays: galaxies