Lineless Quasars at High Redshift: Extremely High Accretion Rate Sources?

Details Lineless Quasars at High Redshift: Extremely High Accretion Rate Sources? Lineless Quasars at High Redshift: Extremely High Accretion Rate Sources?

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008xmm..prop...41s&link_type=abstract

XMM-Newton Proposal ID #06016904

Computer Science

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Sdss J1231+0138, Sdss J0928+1848, Sdss J1012+5313, Sdss J1408+0205

Scientific paper

The Sloan Digital Sky Survey has recently discovered a remarkable group of ~50 quasars at z=2.7-5.9 that lack detectable high-ionization emission lines in their spectra. We propose to continue our XMM-Newton observations of these sources and obtain imaging spectroscopy of five quasars of this class with a total exposure time of 210 ks, providing ~1000 photons per source. This should allow us to measure the hard-X-ray photon index and intrinsic absorption, and search for an iron line and Compton reflection. Steep hard-X-ray spectral slopes will indicate that high accretion rates may be responsible for the suppression of the high ionization emission lines. The proposed observations may lead to new insights about the accretion process and emission-line formation in active galactic nuclei.

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