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Fig. 8

image

Correlation plots extracted from the Orion B maps, convolved to a uniform resolution of 36″ and pixel size of 15″. Dark blue diamonds represent the CO-dark cloud, blue diamonds represent the CO clumps, red squares represent the Horsehead neck, triangles in different shades of green represent the PDRs (bright green is the Horsehead PDR), and yellow triangles represent the H ii region. Edge-on model predictions for selected gas densities are plotted as lines. Dashed lines are for AV,los = 2.5, with dark gray corresponding to a gas density of nH = 3.0 × 103 cm-3, medium gray to nH = 1.6 × 104 cm-3, and light gray to nH = 4.0 × 104 cm-3; dotted lines are the same but for AV,los = 5.0; the medium and light gray dash-dotted lines are for AV,los = 0.5, with nH = 1.6 × 104 cm-3 and nH = 4.0 × 104 cm-3, respectively. In panel f, the best fit is plotted as a line.

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