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The HST Sample of Radio-Loud Quasars: Fe II and Other Correlations

  • D. Wills (a1), K.L. Thompson (a1), M.S. Brotherton (a1), Beverley J. Wills (a1), J. A. Baldwin (a2), R. F. Carswell (a3), I. W.A. Browne (a4) and H. Netzer (a5)...

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We are analyzing the emission lines and continuum spectra of a sample of ~61 radio-loud quasars to investigate dependences amongst various spectral, radio, and X-ray parameters, in particular to look for dependences of spectral properties on inclination of the the radio-jet axis (Wills et al. 1997).

We have carried out conventional correlation analyses, as well as spectral principal-component analyses (SPCA) as described in the previous paper (Wills et al. 1997). We found that the single largest contribution to the spectrum-tospectrum variations was from a component — the ‘first principal component’ (PC1) — that has a more UV (or less red) continuum than the mean spectrum, and a weaker narrow-line (NLR) spectrum. The ‘second principal component’ (PC2) accounts for only 8–12% of the spectrum-to-spectrum variation, contributing a weaker UV, and stronger red continuum, and showing stronger narrow emission lines. There is also a tendency for the broad (BLR) lines in the second principal component spectrum to be narrower (note the sharper He II λ1640 and [O III] λ1663 features redward of the stronger C IV λ1549 emission line, and perhaps a narrow component of the N V λ1240 line redward of Lyα).

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References

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Baker, J.C., Hunstead, R.W., Kapahi, V.K., & Subrahmanya, C.R. 1994, in The First Stromlo Symposium: The Physics of Active Galaxies, ed. Bicknell, G.V., Dopita, M.A., & Quinn, P.J. (San Francisco: Astronomical Society of the Pacific), 195.
Brotherton, M.S. 1997, this volume.
Hes, R., Fosbury, R.A.E., & Barthel, P.D. 1994, in The First Stromlo Symposium: The Physics of Active Galaxies, ed. Bicknell, G.V., Dopita, M.A., & Quinn, P.J. (San Francisco: Astronomical Society of the Pacific), 367.
Wills, B.J., et al. 1997, this volume.

The HST Sample of Radio-Loud Quasars: Fe II and Other Correlations

  • D. Wills (a1), K.L. Thompson (a1), M.S. Brotherton (a1), Beverley J. Wills (a1), J. A. Baldwin (a2), R. F. Carswell (a3), I. W.A. Browne (a4) and H. Netzer (a5)...

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