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- W3099691949 abstract "Recent work has shown that it is possible to systematize quasar spectral diversity in a parameter space called Eigenvector 1 (E1). We present median active galactic nucleus (AGN) spectra for fixed regions of the E1 (optical) parameter space [FWHM(Hβ) vs. equivalent width ratio R = W(Fe II λ4570)/W(Hβ)]. Comparison of the median spectra shows considerable differences. We suggest that an E1-driven approach to median/average spectra emphasizes significant differences between AGNs and offers more insights into AGN physics than a single-population median/average spectrum derived from a large and heterogeneous sample of sources. We find that the Hβ broad component line profile changes along the E1 sequence in FWHM, centroid shift, and profile asymmetry. While objects with FWHM(HβBC) ≲ 4000 km s-1 are well fitted by a Lorentz function, AGNs with FWHM(HβBC) ≳ 4000 km s-1 are better fitted if two broad-line components are used: a classical broad-line component and a very broad/redshifted component." @default.
- W3099691949 created "2020-11-23" @default.
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- W3099691949 date "2002-02-20" @default.
- W3099691949 modified "2023-10-15" @default.
- W3099691949 title "Average Quasar Spectra in the Context of Eigenvector 1" @default.
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- W3099691949 doi "https://doi.org/10.1086/339594" @default.
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