SIMBAD references

Following the recent detection of ³⁶ArH⁺ in the Crab nebula spectrum, we have computed the photodissociation rate of ArH⁺ in order to constrain the physical processes at work in this environment. Photodissociation cross-sections of ArH⁺ were computed in an ab initio approach that includes an explicit account of spin-orbit coupling. We report the photodissociation cross-section of ArH⁺ as a function of wavelength. Photodissociation probabilities are derived for different impinging radiation fields. The photodissociation probability for a very small unshielded cloud surrounded on all sides by the standard unshielded InterStellar Radiation Field (ISRF) model is equal to 9.9x10^–12s^–1 and 1.9x10^–9s^–1 in the Crab nebula conditions. The dependence on the visual extinction is obtained by using the Meudon photon-dominated region (PDR) code, and corresponding analytical fits are provided. These data will help to produce a realistic chemical network to interpret the observations. Photodissociation of ArH⁺ is found to be moderate, and the presence of this molecular ion mainly depends on the molecular fraction.