Kinematics of the ionized-to-neutral interfaces in Monoceros R2

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Table 2

Observational results.

			dv	∫τ dv	N(X)
			[ K km s^-1]	[ km s^-1]	[10¹² cm^-2]

CH⁺	IF	[–5, 5]	–0.94	2.66	8.25
CH⁺	MP1	[–5, 5]	–2.13	4.16	12.9
CH⁺	CP1	[–5, 5]	<–0.55	<2.19	<6.7

CH⁺	IF	[12–20]	4.26	–	74^a
CH⁺	MP1	[12–20]	4.21	–	72^a
CH⁺	CP1	[12–20]	3.05	–	52^a

OH⁺	IF	[–5, 5]	–1.09	2.30	10.8
OH⁺	MP1	[–5, 5]	–0.93	1.75	8.2
OH⁺	CP1	[–5, 5]	–0.64	2.40	11.3

OH⁺	IF	[12–20]	–0.77	1.55	7.3
OH⁺	MP1	[12–20]	–0.93	1.50	7.0
OH⁺	CP1	[12–20]	–0.39	1.36	6.4

H₂O⁺	IF	[–5, 5], [12–20]	–	<1.39	<5.94
H₂O⁺	MP1	[–5, 5], [12–20]	–	<0.20	<0.86

Notes. Upper limits are calculated assuming a 3σ Gaussian profile with a width of 3 km s^-1. column density of CH⁺ observed in emission is calculated for n_H₂ = 2 × 10⁵ cm^-3, T_kin = 100 K, and a line width of 7.5 km s^-1.

^(a)

The

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