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Fig. 3


Integrated intensity map (core; from +5 to +9 km s-1) of C17O 32 in colors, overplotted with the HCN 43 contours tracing outflow activity, namely red wing (from +10 to +25 km s-1) in red contours and blue wing (from 10 to +4 km s-1) emission in blue contours. The plot shows the bipolar outflows driven by IRAS 4A and IRAS 4B Class 0 objects. We do not see such activity toward IRAS 4C. C17O is stronger toward IRAS 4C than toward IRAS 4B. The red and blue contour levels are set to 10, 30, 50, 70, and 100 × rms (rms: 0.02 K). The contours at the top arise because the map is noisier toward the edges.

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