Other
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001tysc.confe..62v&link_type=abstract
Two Years of Science with Chandra, Abstracts from the Symposium held in Washington, DC, 5-7 September, 2001, meeting abstract.
Other
Active Galaxies And Quasars
Scientific paper
We report exploratory Chandra observations of 10 high-redshift (z=4.06-5.27), optically selected quasars. Seven of these quasars are detected, increasing the number of z>4 X-ray detected quasars by 50%. Our detections include four of the five highest-redshift X-ray detected quasars to date, among them SDSSp J021043.17-001818.4, the highest-redshift (z=4.77) radio-loud quasar detected in the X-ray band. The three undetected objects are the Broad Absorption Line quasar SDSSp J112956.10-014212.4, the weak emission-line quasar SDSSp J153259.96-003944.1, and the quasar PSS 1435+3057. A comparison of the quasars' spectral energy distributions (by means of the optical-to-X-ray spectral index, αox) with those of lower-redshift samples indicates that the Chandra quasars are X-ray fainter by a factor ≈2. X-ray faintness could be associated with the presence of large amounts of gas in the primeval galaxies harboring these high-redshift quasars. This suggested scenario would be consistent with recent studies conducted on z>4 quasars in other bands. Using the current Chandra data, predictions for the next generation of X-ray observatories, Constellation-X and XEUS, are also provided.
Brandt Wiliam N.
Kaspi Shai
Schneider David P.
Vignali Christian
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