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| Paper: |
The correlation of line strength with QSO luminosity and redshift from composite spectra |
| Volume: |
290, Active Galactic Nuclei: from Central Engine to Host Galaxy |
| Page: |
489 |
| Authors: |
Corbett, E.; Croom, S.; Boyle, B.; Netzer, H.; Loaring, N.; Miller, L.; Outram, P.; Shanks, T.; Smith, R. |
| Abstract: |
We have measured the widths of the major emission lines (e.g narrow [OIII] λλ 4959,5007, [OII] λ3727 and broad CIV) in composite QSO spectra generated from over 22000 individual low resolution (∼8 Å) QSO spectra from the 2dF (18.25 < J < 20.85) and 6dF (16 < J ≤ 18.25) QSO Redshifts Surveys. Each composite spectrum covers a relatively narrow range in redshift (Δ z = 0.25) and absolute magnitude (Δ = 0.5) with a typical signal-to-noise ratio of over 100. We find strong evidence that the line width of several of the emission lines, including [OIII], Hβ and CIV, is correlated with the QSO luminosity. We discuss the implications of these results for studies of QSO emission line regions and the luminosity - black hole mass relationship. |
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