Fig. 2.

Central part of the PACS maps of M 33. From left to right: intensities of total infrared continuum (TIR), [C II], [O I](63 μm), [C II]/TIR, and [C II]/[O I] intensity ratios. Intensities are in units of erg s−1 cm−2 sr−1. Offsets are in arcminutes relative to the nucleus, after de-rotation of the position angle by 22.5°. The TIR contour is at 2 × 10−3 erg s−1 cm−2 sr−1, the threshold intensity used in the correlation plots to distinguish TIR-bright and TIR-weak regions (Figs. 4–6, 8, 5). The color wedge is the same as in Fig. 1. [C II] contours are the same as in Fig. 1. [O I] contours are 1.4, 3.0, 6.3, 13.8 in units of 10−6 erg s−1 cm−2 sr−1. The map of [C II]/TIR is overlayed with contours at the 0.6% and 1% level of the ratio. The map of [C II]/[O I] is overlayed with the contour of 3.5. Long tic marks in the color wedges indicate contour levels.
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.