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Table 4

Masses within the several regions defined in Sect. 3.2 calculated from the dust optical depth τ160 and from the CO (1 − 0) intensity ICO (1 − 0).

Region Mdust [M] MCO [M]

Entire map 294 200
L1630 283 197
Horsehead PDR 3 1
PDR1 5 3
PDR2 6 4
PDR3 17 13
CO-dark cloud 5 2
CO clumps 12 14
H ii region 11 3
CO-emitting gas 251 175

Notes. For the latter we use an XCO of 2 × 1020 cm-2 (K km s-1)-1 (Bolatto et al. 2013 and references therein). “CO-emitting gas” refers to the part of the map with extended CO emission, that is, the deeper layers of L1630.

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