Journal
ASTROPHYSICAL JOURNAL
Volume 588, Issue 1, Pages 119-127Publisher
IOP PUBLISHING LTD
DOI: 10.1086/378724
Keywords
accretion, accretion disks; intergalactic medium; quasars : general; X-rays : galaxies
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We observed 17 optically selected, radio-quiet, high-redshift quasars with the Chandra ACIS and detected 16 of them. The quasars have redshifts between 3.70 and 6.28 and include the highest-redshift quasars known. When compared with low-redshift quasars observed with ROSAT, these high-redshift quasars are significantly more X-ray-quiet. We also find that the X-ray spectral index of the high-redshift objects is flatter than the average at lower redshift. These trends confirm the predictions of models in which the accretion flow is described by a cold, optically thick accretion disk surrounded by a hot, optically thin corona, provided the viscosity parameter alpha greater than or equal to 0.02. The high-redshift quasars have supermassive black holes, with masses of similar to10(10) M-circle dot, and are accreting material at similar to0.1 times the Eddington limit. We detect 10 X-ray photons from the z = 6.28 quasar SDSS 1030+0524, which might have a Gunn-Peterson trough and be near the redshift of reionization of the intergalactic medium. The X-ray data place an upper limit on the optical depth of the intergalactic medium, tau(IGM) < 10(6), compared to the lower limit from the spectrum of Ly alpha and Ly beta, which implies tau(IGM) > 20.
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