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Table A.2.
Line components along the main sequence.
| Line component | Definition |
|---|---|
| Low-ionization lines (LILs): HI Hβ | |
| HβVBC | Gaussian FWHM ∼ 10 000 km s−1, redshifted by 1−2000 km s−1 (defining property of Pop. B; absent in Pop. A) |
| HβBC | Lorentzian, FWHM ∼ 1−4000 km s−1 (Pop. A); Gaussian FWHM(Hβ) ≳ 4000 km s−1 (Pop. B) |
| Hβ BLUE | Asymmetric Gaussian which models an excess of emission on the blue side of Hβ; usually weak save in ST A3 and A4 |
| Hβ | Sum of HβBC, HβVBC, and BLUE (when applicable); full broad Hβ profile |
| HβNC | Hβ narrow component |
| High-ionization lines (HILs): C IVλ1549 | |
| C IVλ1549VBC | Gaussian FWHM ∼ 10 000 km s−1, redshifted by 1−2000 km s−1 |
| C IVλ1549BC | Lorentzian, if FWHM(Hβ) ≲ 4000 km s−1 (Pop. A); Gaussian FWHM ≳ 4000 km s−1 (Pop. B) |
| C IVλ1549 BLUE | Asymmetric Gaussian which models an excess of emission on the blue side of C IVλ1549; detected in most quasar and most prominent in spectral types A3 and A4 |
| C IVλ1549 | Sum of C IVλ1549BC, C IVλ1549VBC, and C IVλ1549 BLUE; full broad C IVλ1549 profile |
| C IVλ1549NC | C IVλ1549 narrow component, prominent in Pop. B at low-z; almost absent in most Pop. A sources |
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