Top: residual Hα emission after subtraction of the scaled free-free component. Bottom: scatter plot of the residual Hα intensity against the thermal dust optical depth at 353 GHz outside the mask shown above, corresponding to A(Hα) ≲ 0.53 (τ353< 1 × 10-5). The best-fitting linear relation is shown as a dashed line.
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.