Ionized gas in the Scutum spiral arm as traced in [N ii] and [C ii]

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Table 1

Properties of the Scutum arm ionized gas.

b range	V_LSR	I_ion([N ii])	⟨ n(e)⟩	I([C ii])	⟨ n(e)⟩	I([N ii])/	I_ion([C ii])	I_ion([C ii])/	I(H i)	I_HI([C ii])^a
averaged	km s^-1	K km s^-1	cm^-3	K km s^-1	cm^-3	I([C ii])	K km s^-1	I_tot([C ii])	K km s^-1	K km s^-1

–0.̊25 to +0.̊25	110–125	4.05	0.9^b	10.8	0.8^b	0.37	9.7	0.89	521	0.5
0.̊60 to 0.̊90	110–125	0.82	0.4^b	2.2	0.3^b	0.38	2.0	0.92	251	0.2
–0.̊25 to +0.̊25	70–110	25.9	40^c	49.2	18^c	0.53	44.9	<0.91^d	3700	3.4

Notes.

^(a)

The [C ii] intensity from the H i gas is calculated assuming n(H) = 20 cm^-3.

^(b)

n(e) for the WIM is derived from I_ion([N ii]) and I([C ii])assuming L = 1 kpc.

^(c)

n(e) in the ionized boundary layers is derived from I_ion([N ii]) and I([C ii]) assuming L = 8 pc.

^(d)

This value is only an upper limit as there is evidence for foreground and/or self-absorption of [C ii] – see text.

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