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 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007xmm..prop...55s&link_type=abstract

XMM-Newton Proposal ID #05517503

Physics

Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, Sdss J1231+0138, Sdss J0928+1848, Sdss J1141+0219, Xmm-Newton Proposal Id #05517503

Scientific paper

We propose to obtain XMM-Newton spectroscopic imaging observations of a remarkable group of five quasars that lack detectable ultraviolet emission lines at z=2.9-4.0 with a total exposure time of 195 ks. Obtaining ~1000 photons per source, we will 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 emission-line suppression with implications for the physics of the broad-line region. The XMM-Newton data may provide an important linkage between our sources and an apparently related group of radio-quiet, weak-lined active galactic nuclei at low redshift.

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