Free Access

Fig. 12

thumbnail

LVG results from the combined analysis of the 557 and 1670 GHz H2O lines. Each panel corresponds to the choice of gas kinetic temperature indicated in the upper right corner. The filled squares represent the best fit values of n(H2) and N(H2O) / ΔV for the outflows in our sample (one point per source), and the open squares represent fits for L1157-B1 (rightmost point) and L1448-R4 derived using literature values. In all cases, the n(H2) and N(H2O) / ΔV values have been determined by finding, among a grid of more than 104 LVG models, the one that best fits the observed I(557) / I(1670) ratio (within 39′′) and the peak I(1670) intensity (within 13′′). As discussed in the text, this method extrapolates the I(557) / I(1670) ratio to a resolution of 13′′ based on its approximately constant value over the sample. The partially horizontal blue-shaded band is the locus of I(557) / I(1670) values typical of the sample shown in Fig. 11 (the solid line corresponds to a ratio of 3 and the dashed lines to ratios 2 and 4). The blue-shaded band that runs approximately in diagonal is the locus between the first and third quartiles of the observed 1670 GHz peak intensities (solid line is 0.26 K and dashed lines are 0.12 and 0.47 K). The blue dotted lines mark the curves of τ(1670) = 0.1,1, and 10 ordered by increasing N(H2O) / ΔV. The values at the lowest end of the n(H2) range are upper limits.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.