Nitrogen isotopic ratios in Barnard 1: a consistent study of the N2H+, NH3, CN, HCN, and HNC isotopologues

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Table 2

Column densities and isotopic ratios derived from the modelling.


	log(N)	Ratio to main related isotopologue^a		Ratio with ¹²C/¹³C = 60


p-NH₃	14.74		...
p-¹⁵NH₃	12.25	NH₃/¹⁵NH₃ =	300


o-NH₂D	14.73		...
o-¹⁵NH₂D	12.37	NH₂D/¹⁵NH₂D =	230

N₂H⁺	13.48		...
N₂D⁺	13.02	N₂H⁺/N₂D⁺ =	2.9
¹⁵NNH⁺	<10.69	N₂H⁺/¹⁵NNH⁺	>600
N¹⁵NH⁺	10.88	N₂H⁺/N¹⁵NH⁺ =	400


HCN	14.40		...
H¹³CN	12.91	HCN/H¹³CN =	30
HC¹⁵N	12.18	HCN/HC¹⁵N =	165	330
DCN	13.08	HCN/DCN =	20	40
D¹³CN	<12.38	DCN/D¹³CN	>5


HNC	13.77		...
HN¹³C	12.47	HNC/HN¹³C =	20
H¹⁵NC	11.90	HNC/H¹⁵NC =	75	225
DNC	13.31	HNC/DNC =	2.9
DN¹³C	11.84	DNC/DN¹³C =	30


CN	14.78		...
¹³CN	13.08	CN/¹³CN =	50
C¹⁵N	12.40	CN/C¹⁵N =	240	290

Notes. Unconvolved column densities obtained from the modelling of the various molecules. The ratios of the rarest isotopologues with respect to the main one are also given.

^(a)

For singly ¹³C- or ¹⁵N- or D-substituted isotopologue, the column density ratio corresponds to N(main) / N(singly subtituted). For doubly substituted isotopologues (whether ¹³C- and D- or ¹⁵N- and D-substituted), the ratio correspond to N(D-substituted) / N(doubly substituted).

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