Cosmo-tomography toward PKS 1830−211: Variability of the quasar and of its foreground molecular absorption monitored with ALMA

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Fig. 8.

Comparison of the average H₂O spectrum (filled blue) observed in 2016 with the ALMA CH⁺ (1−0) spectrum (orange line) observed in 2015 (Muller et al. 2017) for both lines of sight. For the NE spectrum, the opacity of the CH⁺ line, assuming a filling factor of unity, is reduced by a factor 12.

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