Mapping the H2D+ and N2H+ emission toward prestellar cores. Testing dynamical models of the collapse using gas tracers

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Table 5

Optical depth, τ, of H₂D⁺ and N₂H⁺ estimated with RATRAN at the central position of each core.

Core	Species	τ (QE-BES)	τ (LP)	τ (Static)	τ (SIS)
L183	H₂D⁺ 1₁₀–1₁₁	0.4	0.4	0.4	3.6
L694-2	H₂D⁺ 1₁₀–1₁₁	0.7	0.2	0.3	0.4
L1517B	H₂D⁺ 1₁₀–1₁₁	0.1	0.05	0.08	0.8
L1544	H₂D⁺ 1₁₀–1₁₁	1.5	0.4	0.4	0.2
	N₂H⁺ 4–3	1.6	0.5	0.5	0.2
L1521f	H₂D⁺ 1₁₀–1₁₁	0.08	0.07	0.08	0.02
	N₂H⁺ 4–3	0.7	0.3	0.6	0.5

Notes. The optical depth, τ, at the central position of each core is found to be <1 for both species for most models.

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