Fig. 5
Spectra of the ionizing radiation fields incident upon the PDLA: the quasar spectrum attenuated by the sub-DLA (green), the extragalactic UV background (UVB) at z = 2.5 (blue), and the sum of the two (orange). Specific flux is plotted against frequency, with the ionization edges of various ions annotated on the plot. The derivation of the spectra is discussed in Sect. 6. Note how the QSO spectrum dominates at extreme UV energies (E ≳ 75 eV).
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