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

Yanli Ai, A. C. Fabian, Xiaohui Fan, S. A. Walker, G. Ghisellini, T. Sbarrato, Liming Dou, Feige Wang, Wu Xue-Bing Wu, Longlong Feng

Research output: Contribution to journalArticle

1 Scopus citations

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 count ks-1. In this article, we present results for the quasar from a 65-ks XMM-Newton observation, which constrains its spectral shape well. The quasar is clearly detected with a total of ~460 net counts in the 0.2-10 keV band. The spectrum is characterized by a simple power-law model with a photon index of Γ = 2.30+0.10-0.10 and the intrinsic 2-10 keV luminosity is 3.14 × 1045 erg s-1. The 1σ upper limit to any intrinsic absorption column density is NH = 6.07 × 1022 cm-2. No significant iron emission lines were detected. We derive an X-rayto- optical flux ratio αox of -1.74 ± 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 Chandra observations, which are separated by ~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.

Original languageEnglish (US)
Article numberstx1231
Pages (from-to)1587-1592
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Volume470
Issue number2
DOIs
StatePublished - Sep 11 2017

Keywords

  • Galaxies: active
  • Galaxies: high-redshift
  • Quasars: individual: SDSS J010013.02+280225.8

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'XMM-Newton observation of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.326'. Together they form a unique fingerprint.

  • Cite this

    Ai, Y., Fabian, A. C., Fan, X., Walker, S. A., Ghisellini, G., Sbarrato, T., Dou, L., Wang, F., Xue-Bing Wu, W., & Feng, L. (2017). XMM-Newton observation of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.326. Monthly Notices of the Royal Astronomical Society, 470(2), 1587-1592. [stx1231]. https://doi.org/10.1093/mnras/stx1231