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Fig. 3.


Three northern most regions of M 33 covered with PACS. Top row: northernmost region. Middle row: northern region. Bottom row: BCLMP 691. 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, the same as in Fig. 2. The TIR color wedge is the same as in Fig. 1. Contours of TIR, [C II], [O I], [C II]/TIR, and [C II]/[O I] are the same as in Fig. 2. The dashed [C II] contour for BCLMP 691 corresponds to a constant intensity of 22.4 × 10−6 erg s−1 cm−2 sr−1 derived from the best-fitting y-intercept in the correlation plot of log[C II]/TIR vs. logTIR, for a slope of −1 (Fig. 9).

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