Nuclear de-excitation line emissions from giant molecular clouds

Open Access

Fig. 7

CR ionization rates at different distances from the center of the hypothetical GMCs. The diffusion coefficient of the CRs is D₀ = 4 × 10²⁸ cm²/s (solid lines) or D₀ = 4 × 10²⁶ cm²/s (dashed lines), and the mass of the molecular cloud is 1 × 10⁶ M_⊙ (black lines) or 1 × 10⁵ M_⊙ (gray lines).

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