XMM-Newton observation of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.326

Abstract

A brief Chandra observation of the ultraluminous quasar, SDSS J010013.02+280225.8 at redshift 6.326, showed it to be a relatively bright, soft X-ray source with a count rate of about 1 ct/ks. In this paper we present results for the quasar from a 65ks XMM-Newton observation, which well constrains its spectral shape. The quasar is clearly detected with a total of $\sim$ 460 net counts in the 0.2-10 keV band. The spectrum is characterised by a simple power-law model with photon index of $\Gamma =2.30_{-0.10}^{+0.10}$, and the intrinsic 2-10 keV luminosity is $3.14\times 10^{45}$ erg ${\text{s}}^{-1}$. The 1 $\sigma$ upper limit to any intrinsic absorption column density is $N_H=6.07\times 10^{22}{\text{cm}}^{-2}$. No significant iron emission lines were detected. We derive the X-ray-to-optical flux ratio ${\alpha }_{\text{ox}}$ of $-1.74\pm$0.01, consistent with the values found in other quasars of comparable ultraviolet luminosity. We did not detect significant flux variations either in the XMM-Newton exposure or between XMM-Newton and XMM-Newton observations, which are separated by $\sim$ 8 months. The X-ray observation enables the bolometric luminosity to be calculated after modelling the spectral energy distribution: the accretion rate is found to be sub-Eddington.

6 pages, 6 figures, accepted by MNRAS

References in corpus (15)

• A Catalog of Quasar Properties from SDSS DR7
• A luminous quasar at a redshift of z = 7.085
• Observational constraints on Cosmic Reionization
• An ultra-luminous quasar with a twelve-billion-solar-mass black hole at redshift 6.30
• The X-ray-to-Optical Properties of Optically-Selected Active Galaxies Over Wide Luminosity and Redshift Ranges
• The X-ray Properties of the Most-Luminous Quasars from the Sloan Digital Sky Survey
• X-ray Insights into the Nature of PHL 1811 Analogs and Weak Emission-Line Quasars: Unification with a Geometrically Thick Accretion Disk?
• Are Optically-Selected Quasars Universally X-Ray Luminous? X-Ray/UV Relations in Sloan Digital Sky Survey Quasars
• Chandra Observations of the Highest Redshift Quasars from the Sloan Digital Sky Survey
• Chandra ACIS-I particle background: an analytical model
• A large sample of Kohonen-selected SDSS quasars with weak emission lines: selection effects and statistical properties
• Do high redshift quasars have powerful jets?
• X-ray spectroscopy of the z=6.4 quasar J1148+5251
• Milli-arcsecond imaging of the radio emission from the quasar with the most massive black hole at reionization
• A Photo-Hadronic Model of the Large Scale Jet of PKS 0637-752

Cited by in corpus (7)

• The X-shooter/ALMA Sample of Quasars in the Epoch of Reionization. II. Black Hole Masses, Eddington Ratios, and the Formation of the First Quasars
• Revealing the Accretion Physics of Supermassive Black Holes at Redshift z~7 with Chandra and Infrared Observations
• HYPerluminous quasars at the Epoch of ReionizatION (HYPERION). A new regime for the X-ray nuclear properties of the first quasars
• Deep XMM-Newton Observations of an X-ray Weak, Broad Absorption Line Quasar at $z=6.5$
• An X-ray fading, UV brightening QSO at $z\approx 6$
• Exploring the radio spectral energy distribution of the ultraluminous radio-quiet quasar SDSS J0100+2802 at redshift 6.3
• X-Ray Evidence Against the Hypothesis that the Hyper-Luminous z=6.3 Quasar J0100+2802 is Lensed