Table 9.
Physical quantities derived from the composite spectra of quasars from the Milliquas catalogue shown in Fig. 33.
Composite spectrum | Continuum slope, αν | Line+λlab (nm) | λobs (nm) | F/Fref(a) | FWHM (nm) |
---|---|---|---|---|---|
0.052 ≤ z < 0.5 | −0.4506 ± 0.1453 | Mg IIλ279.875 | 280.064 ± 0.234 | 1.00000 ± 0.01036 | 8.308 ± 0.214 |
2571 sources | Hγλ434.168 | 435.221 ± 0.588 | 0.13927 ± 0.00369 | 10.432 ± 0.586 | |
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Hβλ486.268 | 486.936 ± 0.081 | 0.46937 ± 0.00233 | 12.874 ± 0.131 | |
Hαλ656.461 | 656.240 ± 0.010 | 1.27766 ± 0.00095 | 17.971 ± 0.035 | ||
0.5 ≤ z < 1 | −0.4291 ± 0.0570 | C III]λ190.873 | 191.144 ± 0.134 | 1.80831 ± 0.03931 | 5.583 ± 0.262 |
8810 sources | Mg IIλ279.875 | 279.644 ± 0.084 | 1.00000 ± 0.00238 | 10.613 ± 0.120 | |
![]() |
Hγλ434.168 | 433.932 ± 0.048 | 0.25984 ± 0.00099 | 10.355 ± 0.123 | |
Hβλ486.268 | 486.825 ± 0.042 | 0.53950 ± 0.00085 | 18.263 ± 0.082 | ||
Hαλ656.461 | 661.947 ± 0.100 | 1.36875 ± 0.00735 | 23.063 ± 0.684 | ||
1 ≤ z < 2 | −0.6115 ± 0.0227 | Lyαλ121.567 | 122.264 ± 0.029 | 1.00000 ± 0.00826 | 4.411 ± 0.097 |
20 755 sources | Si IVλ139.676 | 139.925 ± 0.051 | 0.14881 ± 0.00292 | 3.637 ± 0.111 | |
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C IVλ154.906 | 154.636 ± 0.050 | 0.29494 ± 0.00154 | 4.477 ± 0.043 | |
C III]λ190.873 | 190.124 ± 0.093 | 0.13300 ± 0.00039 | 7.729 ± 0.068 | ||
Mg IIλ279.875 | 280.056 ± 0.053 | 0.08408 ± 0.00026 | 8.026 ± 0.047 | ||
Hγλ434.168 | 433.450 ± 0.101 | 0.01752 ± 0.00013 | 11.683 ± 0.292 | ||
Hβλ486.268 | 490.168 ± 5.268 | 0.03491 ± 0.00070 | 23.559 ± 2.499 | ||
2 ≤ z < 3 | −0.7752 ± 0.0113 | O VIλ103.383 | 103.589 ± 0.152 | 0.18338 ± 0.00686 | 3.279 ± 0.342 |
9870 sources | Lyαλ121.567 | 122.156 ± 0.022 | 1.00000 ± 0.00160 | 4.908 ± 0.024 | |
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Si IVλ139.676 | 139.738 ± 0.086 | 0.11467 ± 0.00068 | 4.927 ± 0.129 | |
C IVλ154.906 | 154.465 ± 0.049 | 0.19586 ± 0.00041 | 5.854 ± 0.114 | ||
C III]λ190.873 | 190.589 ± 0.047 | 0.11133 ± 0.00107 | 6.742 ± 0.164 | ||
Mg IIλ279.875 | 279.941 ± 0.091 | 0.07435 ± 0.00019 | 9.471 ± 0.078 | ||
3 ≤ z < 4 | −0.7155 ± 0.0548 | O VIλ103.383 | 103.381 ± 0.112 | 0.21926 ± 0.00277 | 5.202 ± 0.935 |
929 sources | Lyαλ121.567 | 122.398 ± 0.086 | 1.00000 ± 0.00489 | 5.591 ± 0.083 | |
![]() |
Si IVλ139.676 | 139.980 ± 0.232 | 0.12360 ± 0.00895 | 4.588 ± 0.486 | |
C IVλ154.906 | 154.581 ± 0.151 | 0.24250 ± 0.00306 | 3.928 ± 0.107 | ||
C III]λ190.873 | 190.161 ± 0.118 | 0.13617 ± 0.00097 | 6.488 ± 0.094 | ||
0.052 ≤ z ≤ 4.358 | −0.4639 ± 0.0057 | O VIλ103.383 | 103.500 ± 0.103 | 0.19285 ± 0.00584 | 3.784 ± 0.517 |
42 944 sources | Lyαλ121.567 | 122.202 ± 0.037 | 1.00000 ± 0.00259 | 5.088 ± 0.036 | |
![]() |
Si IVλ139.676 | 139.838 ± 0.141 | 0.11467 ± 0.00146 | 4.672 ± 0.139 | |
C IVλ154.906 | 154.542 ± 0.052 | 0.21615 ± 0.00132 | 5.383 ± 0.066 | ||
C III]λ190.873 | 190.232 ± 0.056 | 0.11681 ± 0.00072 | 7.938 ± 0.097 | ||
Mg IIλ279.875 | 280.006 ± 0.034 | 0.08202 ± 0.00025 | 8.891 ± 0.047 | ||
Hγλ434.168 | 434.164 ± 0.059 | 0.02165 ± 0.00016 | 10.706 ± 0.129 | ||
Hβλ486.268 | 486.846 ± 0.109 | 0.04867 ± 0.00011 | 16.473 ± 0.179 | ||
Hαλ656.461 | 656.257 ± 0.014 | 0.13924 ± 0.00011 | 18.026 ± 0.032 |
Notes. The reduced chi-square, , is obtained from Eq. (C.1). The frequency continuum slope, αν, is computed from the wavelength continuum slope, αλ = −αν − 2, where the continuum is modelled through a power law of the form Cλ ∝ λαλ. In Fig. 33, the continuum is plotted as the lowest line joining the two most widely separated points in the range 121 − 600 nm without crossing the spectrum in this range. The emission line location, λobs, and maximal line flux density, F, are retrieved from the fit of a quadratic polynomial in the vicinity of the laboratory wavelength, λlab, after a local continuum has been subtracted that was computed in the same way as for αλ. The full-width at half maximum (FWHM) is retrieved from these continuum-subtracted emission lines using a linear interpolation of the spectral flux densities. All uncertainties are calculated, to first order, using the formal uncertainties on the composite spectra obtained from Eq. (C.4).
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