Exploratory [ITAL]Chandra[/ITAL] Observations of the Three Highest Redshift Quasars Known
Open Access
- 10 April 2002
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 569 (1) , L5-L9
- https://doi.org/10.1086/340581
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.Keywords
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