Fig. 4
Perseus filaments (from left to right and top to bottom: NGC 1333, Barnard 1, IC 348, L1448, and B5) dust opacity maps at 850 μm by Zari et al. (2016), convolved at an angular resolution of 36″. Contours are (0.056, 0.13, 0.24, 0.56, 1.01, and 1.6) × 10−3, which according to expression (7) from Zari et al. (2016) corresponds to visual extinctions of ~5, 7.5, 10, 15, 20, and 25 mag, respectively. Positions observed with the 30 m telescope are indicated with triangles. Blue triangles represent the positions of the starless cores.
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