Herschel/HIFI observations of interstellar OH+ and H2O+ towards W49N: a probe of diffuse clouds with a small molecular fraction

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Table 1:

W49N absorption line components.
$v_{\rm LSR}$	$\Delta v$	$N({\rm OH^+})$	$N({\rm H_2O^+})$	$\rm OH^+/H_2O^+$	$f({\rm H_2})$ ^a
$\rm km~s^{-1}$	$\rm km~s^{-1}$	$10^{13}\rm cm^{-2}$	$10^{13}\rm cm^{-2}$
6.6	5.1	2.9	0.42	6.8	0.034
13.4	4.6	2.2	0.69	3.2	0.082
21.2	7.0	8.2	0.56	14.6	0.015
34.7	9.0	26.1	2.68	9.7	0.023
43.5	8.4	7.5	0.72	10.5	0.021
62.5	13.3	18.9	1.67	11.3	0.019

Notes. ^(a) Using Eq. (1) for an assumed temperature of 100 K and an assumed electron abundance of $1.4 \times 10^{-4}$ . The required molecular fraction, $f({\rm H_2})$ , scales as $T^{-0.5}~x_{\rm e}$ .

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