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Table 4

Best-fit values obtained with the two velocity-component fit in L1455 A1 for both N2H+ and N15NH+ (1-0) transitions.

Parameter Comp. 1 Comp. 2 1 + 2
N2H+
Ncol (1013 cm−2) 0.149 ± 0.014 1.14 ± 0.04 1.29 ± 0.04
Tex (K) 7.2 (a) 5.83 ± 0.14
Vlsr (km s−1) 5.408 ± 0.008 4.943 ± 0.003
FWHM (km s−1) 0.275 ± 0.016 0.474 ± 0.012

N15NH+
Ncol (1010 cm−2) 0.44 ± 0.14 1.86 ± 0.19 2.3 ± 0.2
Tex (K) 7.2 (b) 5.83 (b)
Vlsr (km s−1) 5.408 (b) 4.943 (b)
FWHM (km s−1) 0.275 (b) 0.474 (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 respective one in N2H+ analysis.

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