Exploratory Chandra observations of the three highest redshift quasars known

William N. Brandt, Donald P. Schneider, Xiaohui Fan, Michael A. Strauss, James E. Gunn, Gordon T. Richards, Scott F. Anderson, Daniel E. Vanden Berk, Neta A. Bahcall, J. Brinkmann, Robert Brunner, Bing Chen, G. S. Hennessy, Donald Q. Lamb, Wolfgang Voges, Donald G. York

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

We report on exploratory Chandra observations of the three highest redshift quasars known (z = 5.82, 5.99, and 6.28), all found in the Sloan Digital Sky Survey. These data, combined with a previous XMM-Newton observation of a z = 5.74 quasar, form a complete set of color-selected, z>5.7 quasars. X-ray emission is detected from all of the quasars at levels that indicate that the X-ray-to-optical flux ratios of z ≈ 6, optically selected quasars are similar to those of lower redshift quasars. The observations demonstrate that it will be feasible to obtain quality X-ray spectra of z ≈ 6 quasars with current and future X-ray missions.

Original languageEnglish (US)
Pages (from-to)L5-L9
JournalAstrophysical Journal
Volume569
Issue number1 II
DOIs
StatePublished - Apr 10 2002
Externally publishedYes

Keywords

  • Galaxies: active
  • Galaxies: nuclei
  • Quasars: general
  • X-rays: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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