Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-08-07
Astronomy and Astrophysics
Astrophysics
7 pages with 2 figures. Needs paspconf.sty. To appear in Proc. of the Conference `Structure and Kinematics of Quasar Broad Lin
Scientific paper
A unique, essentially complete sample of 22 QSOs, with high quality soft X-ray spectra from ROSAT, as well as HST and optical spectrophotometry from below Ly-alpha to above H-alpha, is being used to investigate the relationships among the ionizing continuum and the optical and UV continuum, emission and absorption lines. Here we present a first analysis showing that optical `Eigenvector 1' linking steeper soft X-ray spectra with increasing optical Fe II strength, decreasing [O III] 5007 emission, and narrower BLR H-beta emission, extends to the UV emission lines, and is manifested by weaker C IV 1549 emission, stronger Si III] 1892/C III] 1909 ratio, and narrower C III] 1909 emission. Steeper soft X-ray spectra have been linked to higher L/L_Edd ratios, thus apparently linking BLR densities, high and low ionization gas, and kinematics, to the accretion process.
Brotherton Michael S.
Ferland Gary J.
Laor Ari
Wilkes Belinda J.
Wills Beverley J.
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