First sample of N2H+ nitrogen isotopic ratio measurements in low-mass protostars

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Table 3

Best-fit values obtained with the two velocity-component fit in L1448 C for both N₂H⁺ and N¹⁵NH⁺ (1-0) transitions.

Parameter	Comp. 1	Comp. 2	1 + 2
N₂H⁺
N_col (10¹³ cm⁻²)	0.52 ± 0.06	2.75 ± 0.09	3.27 ± 0.11
T_ex (K)	6.41 ^(a)	4.76 ± 0.13
V_lsr (km s⁻¹)	5.124 ± 0.006	5.025 ± 0.008
FWHM (km s⁻¹)	0.49 ± 0.02	0.99 ± 0.02

N¹⁵NH⁺
N_col (10¹⁰ cm⁻²)	0.5 ± 0.4	6.4 ± 0.7	6.9 ± 0.8
T_ex (K)	6.41 ^(b)	4.76 ^(b)
V_lsr (km s⁻¹)	5.124 ^(b)	5.025 ^(b)
FWHM (km s⁻¹)	0.49 ^(b)	0.99 ^(b)

Notes. The last column reports the total column density of each isotopologue, from which ¹⁴N/¹⁵N is computed. ^(a)Parameter fixed to the best-fit value found with the one-component analysis. ^(b) Parameter fixed to the corresponding one in N₂H⁺ analysis.

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