CO depletion in infrared dark clouds | Astronomy & Astrophysics (A&A)

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Table 4

Average values extracted for all four IRDCs.

Cloud	⟨T_ex⟩(K)	⟨τ₁₀⟩	⟨τ₂₁⟩	β	f_D	${f^{'}}_{D}$ ${f'_D}$
G24.94-00.15	6.4	0.3	0.6	3.7	6	1.6
G23.46-00.53	5.8	0.4	0.6	4.7	7	1.5
G24.49-00.70	6.8	0.4	0.7	2.9	15	5
G25.16-00.28	7.0	0.3	0.6	4.3	11	2.5

Notes. Column density-weighted T_ex and τ, f_D normalisation factors, Herschel mass surface density-weighted CO depletion factor, and normalised CO depletion factor. The average CO depletion factors (normalised and non-normalised) were obtained by considering pixels with Σ_FIR ≥0.1 g cm⁻².

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