Weak-line Quasars: Always X-ray Weak?

Details Weak-line Quasars: Always X-ray Weak? Weak-line Quasars: Always X-ray Weak?

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cxo..prop.2872l&link_type=abstract

Chandra proposal ID #11700324

Physics

Scientific paper

We propose to explore the link between the shape of the spectral energy distribution and UV emission lines in quasars. Detailed study of the bright quasar PHL 1811 shows that the unusual emission line properties including low high-ionization lines, absent forbidden and semiforbidden lines and strong SiII and FeII are a consequence of its persistently X-ray weak SED. Are all objects with weak lines also X-ray weak? To test this hypothesis, we use an automated fitting program to construct a sample of SDSS quasars with spectra similar to that of PHL 1811, and select 10 objects with CIV equivalent widths less than 10 angstroms (a factor of 3 lower than typical) yet bright enough for detection even if a factor of 11 weaker in X-rays than typical quasars.

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