Prestellar and protostellar cores in Orion B9 | Astronomy & Astrophysics (A&A)

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Table 8:

N₂H⁺ and N₂D⁺ column densities, fractional abundances, and the column density ratio.
	$N({\rm N_2H^+})$	$N({\rm N_2D^+})$	$x({\rm N_2H^+})$	$x({\rm N_2D^+})$
Position	[10¹² cm^-2]	[10¹¹ cm^-2]	[10^-10]	[10^-11]	$R_{\rm deut} \equiv N({\rm N_2D^+})/N({\rm N_2H^+})$
IRAS 05405-0117	$9.14\pm0.08$ ^a	$3.19\pm0.37$	11.1	4.9	$0.03\pm0.004$
Ori B9 E	$4.54\pm0.65$	$1.90\pm1.39$	6.9	5.0	$0.04\pm0.03$
Ori B9 N^b	$4.11\pm1.51$	$1.46\pm0.65$	3.9	1.9	$0.04\pm0.02$

^a Harju et al. (2006) estimated slightly lower N₂H⁺ column density, ${\sim}6{-}8\times 10^{12}$ cm^-2, toward IRAS 05405-0117 from the N₂H⁺(1-0) data of Caselli & Myers (1994).
^b For the other velocity component $N({\rm N_2H^+})=1.56\pm0.09\times 10^{12}$ cm^-2, $N({\rm N_2D^+})=7.64\pm5.44\times 10^{10}$ cm^-2, and $R_{\rm deut}=0.05\pm0.03$ .

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