Destroying Degeneracy: Spanning the Luminosity Range for Radio-Quiet Quasars at z=4

Details Destroying Degeneracy: Spanning the Luminosity Range for Radio-Quiet Quasars at z=4 Destroying Degeneracy: Spanning the Luminosity Range for Radio-Quiet Quasars at z=4

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1518b&link_type=abstract

Chandra Proposal ID #05700572

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Chandra Proposal Id #05700572

Scientific paper

The existing sample of quasars with X-ray data suffer from selection so that luminosity is artificially correlated with redshift. In our Chandra+XMM survey of radio-quiet z>=4 quasars, we found that alpha_ox and Gamma_x are strong functions of redshift but also weak functions 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 (5ksec); this strategy of course only strengthens the L-z correlation in the available X-ray sample. To remedy the situation, we wish to observe 7 faint, radio-quiet quasars at z=4. We will test how blackhole mass and accretion rate depend on L and z, using new models for accretion disks with hot coronae.

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