Exploratory Chandra Observations of the Three Highest Redshift Quasars Known

Details Exploratory Chandra Observations of the Three Highest Redshift Quasars Known Exploratory Chandra Observations of the Three Highest Redshift Quasars Known

2002-02-12

arxiv.org/abs/astro-ph/0202235v2

Astrophys.J. 569 (2002) 5

Astronomy and Astrophysics

Astrophysics

15 pages, ApJL, in press; small revisions to address referee Comments

Scientific paper

10.1086/340581

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.

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