Abstract
ABSTRACT We report exploratory Chandra observations of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.30. The quasar is clearly detected by Chandra with a possible component of extended emission. The rest-frame 2–10 keV luminosity is 9.0 − 4.5 + 9.1 × 1045 erg s−1 with an inferred photon index of Γ = 3.03 − 0.70 + 0.78 . This quasar is X-ray bright, with an inferred X-ray-to-optical flux ratio α ox = − 1.22 − 0.05 + 0.07 , higher than the values found in other quasars of comparable ultraviolet luminosity. The properties inferred from this exploratory observation indicate that this ultraluminous quasar might be growing with super-Eddington accretion and probably viewed with a small inclination angle. Deep X-ray observations will help to probe the plausible extended emission and better constrain the spectral features for this ultraluminous quasar.
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