High-sensitivity maps of molecular ions in L1544 - I. Deuteration of N2H+ and HCO+ and primary evidence of N2D+ depletion

Open Access

Table 4

Peak values of the column densities for the different molecules.

Molecule^(a)	N_col/cm⁻²
N₂H⁺

N₂D⁺

HC¹⁸O⁺

HCO⁺

DCO⁺

Notes. ^(a) The column density of HCO⁺ is derived from the one of HC¹⁸O⁺ using the standard isotopic ratio ¹⁶O∕¹⁸O = 557 (see main text).

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