Excitation of CO molecules in diffuse gas over cosmic history
V V Klimenko,
S A Balashev,
P Noterdaeme
et al.
Abstract:We studied the physical conditions in the local ISM and at high redshift by fitting observed column densities of CO and H2 rotational levels, and C i fine-structure levels using photo-dissociation models calculated with the Meudon PDR code. We analyzed CO absorption systems in 28 sight lines in the local ISM and 7 damped Lyman-α absorption systems at high redshift, covering N(H2) = 1019 to 1021.5 cm−2 and N(CO) = 1013 to 1018 cm−2. We constructed a method to accurately calculate CO excitation, incorporating th… Show more
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