Fig. 1
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Hydrogen column density maps (N(H2)) derived from Spitzer 8 μm extinction. The contours show the integrated intensity map of the main component of NH3 (1,1) line. The void regions in L694-2 and L1517B of very low N(H2) correspond to nearby bright point 8 μm sources. The beam size is indicated as a white filled circle in each figure. For L694-2 and L429 the contours start from 1 K km s−1 and 1.5 K km s−1, respectively, with a spacing of 0.5 K km s−1. For L1517B the contours start from 0.5 K km s−1 with a spacing of 0.3 K km s−1.
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