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Table 1.

Spectral properties of 5BZQ J1243+4043 across the three epochs.

Spectrum Component Flux Rest-frame EW FWHM
10−16  erg cm−2 s−1 Å−1 Å km s−1
NOT #1 Continuum 1.34 ± 0.24
C III 3.47 ± 0.90 23.43 ± 2.11 6007.87 ± 90.12
Mg II 2.01 ± 0.40 24.87 ± 2.98 6972.74 ± 146.43
LAMOST #2 Continuum 2.21 ± 0.49
C IV < 1.26 4000.00 (a)
C III < 1.72 4000.00 (a)
Mg II < 1.35 4000.00 (a)
GTC #3 Continuum 0.30 ± 0.05
C IV 0.66 ± 0.07 36.30 ± 4.36 4774.69 ± 42.97
He II 0.25 ± 0.04 1.74 ± 0.14 1254.48 ± 3.76
N III 0.77 ± 0.13 2.82 ± 0.23 1499.47 ± 7.50
C III 0.96 ± 0.14 25.10 ± 3.26 6152.56 ± 86.14
Mg II 0.53 ± 0.08 51.87 ± 10.37 5628.52 ± 157.60

Notes. The first column reports the reference spectrum. The second, third, fourth and fifth columns list the spectral component with corresponding flux, either measured or limits, rest-frame EW and FWHM.

(a)

In spectrum #2, we placed ULs on the undetected emission lines by fixing the FWHM (see Paper PI).

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