Erratum for: A&A 570, A27 (2014), DOI: 10.1051/0004-6361/201423526

We have noticed two typos in our original paper. In Sect. 3.1, Eq. (2), which gives the expression of the effective temperature of an ion-neutral reaction, should read (Pineau des Forêts et al. 1986) $\begin{array}{ccc}{\mathit{T}}_{\mathrm{eff}}\mathrm{=}\frac{{\mathit{m}}_{\mathrm{1}}{\mathit{T}}_{\mathrm{2}}\mathrm{+}{\mathit{m}}_{\mathrm{2}}{\mathit{T}}_{\mathrm{1}}}{{\mathit{m}}_{\mathrm{1}}\mathrm{+}{\mathit{m}}_{\mathrm{2}}}\mathrm{+}\frac{\mathrm{1}}{\mathrm{3}\mathit{k}}\frac{{\mathit{m}}_{\mathrm{1}}{\mathit{m}}_{\mathrm{2}}}{{\mathit{m}}_{\mathrm{1}}\mathrm{+}{\mathit{m}}_{\mathrm{2}}}{\mathit{u}}_{\mathrm{D}}^{\mathrm{2}}\mathit{.}& & \end{array}$(1)In Sect. 5.2, the destruction timescale of the CH⁺ by reaction with H₂ should read ~1 yr ${\mathit{f}}_{{\mathrm{H}}_{\mathrm{2}}}^{-1}\hspace{0.17em}\mathrm{(}\mathrm{50}\hspace{0.17em}{\mathrm{cm}}^{-3}\mathit{/}{\mathit{n}}_{\mathrm{H}}\mathrm{)}$. These correct expressions are those that have been used in all the calculations performed in our original paper. These typos have therefore no bearing on the paper results/conclusions.

References

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