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2000ApJ...528..637B - Astrophys. J., 528, 637-649 (2000/January-2)
On the nature of soft X-ray weak quasi-stellar objects.
BRANDT W.N., LAOR A. and WILLS B.J.
Abstract (from CDS):
We have also identified several notable differences between the optical emission-line properties of SXW QSOs and those of the other Boroson & Green QSOs. SXW QSOs show systematically low [O III] luminosities and equivalent widths as well as distinctive Hβ line profiles. They tend to lie toward the weak [O III] end of Boroson & Green eigenvector 1, as do many low-ionization BAL QSOs. Unabsorbed Seyfert galaxies and QSOs with similar values of eigenvector 1 have been suggested to have extreme values of a primary physical parameter, perhaps mass accretion rate relative to the Eddington rate (M{dot}/M{dot}Edd). If these suggestions are correct, it is likely that SXW QSOs also tend to have generally high values of M{dot}/M{dot}Edd. Finally, we present and discuss correlations between αox and other QSO observables after removal of the SXW QSOs.
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Journal keyword(s): Galaxies: Active - Galaxies: Nuclei - Galaxies: Quasars: General - X-Rays: Galaxies
Simbad objects: 87
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