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This article has an erratum: [https://doi.org/10.1051/0004-6361/201423526e]


Fig. 6

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Left panels: column densities of selected species integrated across a single vortex as functions of time during the isochoric relaxation phase. The models are computed for two values of the vortex dissipation integral EτV = 1.4 × 10-11 erg cm-1 (top panels) and EτV = 1.4 × 10-13 erg cm-1 (bottom panels). The corresponding vortex lifetimes are indicated with vertical straight lines. All the other parameters are set to their standard values. Right panels: comparison of observations with the predictions of TDR models. The observed CO and HCO+ column densities (open circles) are from Lucas & Liszt (1996); Liszt & Lucas (1998, 2004). The predictions of the TDR models (filled symbols) are shown for AV = 0.2 (red), 0.4 (magenta), and 0.8 (blue) mag, nH = 30 (triangles), nH = 50 (squares), nH = 100 (circles), and nH = 300 cm-3 (upside-down triangles), and a total column density NH = 1.8 × 1021 cm-2; along each curve, the rate-of-strain a varies between 10-11 (right) and 10-10 s-1 (left).

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