Kinetic temperature map of NGC 1333 IRAS 4 (left). During the fitting procedure all the seven H2CO detected lines are taken into account for the positions with S/N> 3. The white contour shows the region where at least two lines were detected with S/N> 3. The kinetic temperature is higher toward the Class 0 objects IRAS 4A (~ 45 K) and IRAS 4B (~ 80 K), while it is significantly lower toward IRAS 4C (~ 12 K). We also note the compact emission toward IRAS 4-SWC (~ 15 K), which has been observed in channel maps of other molecules (e.g., CH3OH, and SO, Fig. 11). The tau map of H2CO 50,5–40,4 presents values in the optically thin regime throughout the cloud (middle; ~0.1−0.7). The best resulting χ2 varies between ~1−5 in the region of the sources (right).
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