Predictions of photoionization models for the absorber ABS1 with Z = Z⊙, in the case it is illuminated by QSO1 and the UVB (see Appendix F for details on the models assumptions). The predicted column densities for H I, C IV, N V, C II, and Si II are plotted as a function of distance from QSO1. The horizontal green lines with arrows indicate the observational limits for the same metal ions, while the blue shaded regions show the observational limits for H I. The green hatched boxes indicate the regions where the models matched the observations. The model curves are color-coded following the predicted temperature. The gray dashed lines represent the curves for N V for Z = 0.5 Z⊙. The models in agreement with the observations are characterized by 4.1 ≲ log(T/K) ≲ 4.4 and −1.7 ≲ log U ≲ −0.7. To match the N V absorption, the metallicity should be Z > 0.3 Z⊙.
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