Destroying Degeneracy: Chandra Observations of Faint Radio-Quiet Quasars at z=4

Details Destroying Degeneracy: Chandra Observations of Faint Radio-Quiet Quasars at z=4 Destroying Degeneracy: Chandra Observations of Faint Radio-Quiet Quasars at z=4

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.2618k&link_type=abstract

American Astronomical Society, HEAD meeting #8, #26.18; Bulletin of the American Astronomical Society, Vol. 36, p.962

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The existing sample of quasars with X-ray data suffers from selection such that luminosity is artificially correlated with redshift. In our Chandra+XMM survey of radio-quiet z ≥ 4 quasars, we found α ox and Γ ox are strong functions of redshift but also weak function of luminosity, whereas other studies suggest that these X-ray parameters depend most strongly on L. So far, only the brightest z > 4 quasars have been targeted with Chandra, so that exposure times would be short (5 ksec); this strategy only strengthens the L-z correlation in the available X-ray sample. To remedy this situation, we observed 7 faint, radio-quiet quasars at z ˜ 4. We investigate how blackhole mass and accretion rate depend on L and z, using new models for accretion disks with hot coronae.

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