Survey of Radio Quiet Z>4 Quasars

Details Survey of Radio Quiet Z>4 Quasars Survey of Radio Quiet Z>4 Quasars

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..672b&link_type=abstract

Chandra Proposal ID #02700726

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Chandra Proposal Id #02700726

Scientific paper

We propose to measure the X-ray flux of 7 previously undetected, optically bright quasars with z>4, including one at z=5. Before Chandra, only 6 radio quiet quasars with z>4 had been detected in X-rays. Our AO1 survey has so far added 4 more, and observations of 3 others are scheduled. The ones observed so far are, surprisingly, all very X-ray quiet, with alpha_{ox}>2.2, unlike the ones which had been detected with ROSAT which had alpha_{ox}=1.5-1.7. Three of the proposed AO2 quasars had not been discovered in time for AO1 proposals. We draw our sample from the objects whose emission line spectra have been observed by Shields and Hamman with Keck and the MMT. These well-studied objects form the definitive sample of the highest redshift quasars known.

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