Fig. 6
Calculated line ratios for c-C3H2, H2 CO, DCO+, and 13CO. The black lines show the modeled ratios assuming a column density of 1012 cm−2 for c-C3 H2, H2 CO, and DCO+, and 1016 cm−2 for 13CO. For the 13CO 6–5/3–2 and 6–5/4–3 panels, the two lower lines show the 0.02 and 0.04 ratios. The shaded areas show the results for the gas temperature calculations and adopted H2 density range for individual systems: L1448N (cyan), NGC 1333 SVS 13 (blue), NGC 1333 IRAS 7 (light blue), NGC 1333 IRAS 1 or IRAS 03292+3039 (gray), and NGC 1333 IRAS 5 Per52 or NGC 1333 SK1 (red).
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