A search for the favored hyperfine transition of a 6.7 GHz methanol maser line

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Volume 701 (September 2025)

A&A, 701 (2025) A101

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Table 3

Comparison of the magnetic field along the line of sight as measured from the Zeeman splitting of the 6.7 GHz CH₃OH, considering three different hyperfine transitions, and 6.035 GHz ex-OH maser features in ON 1 and W75N.

(1)	(2)	(3)	(4)	(5)	(6)	(7)
Maser	$Δ V_{Z}^{{C H}_{3} O H}$ $\Delta V_{\mathrm{Z}}^{\mathrm{CH}_{3} \mathrm{OH}}$	$F_{u p} \to F_{d o w n}$ $F_{{up}} \rightarrow F_{{down}}$	$α_{Z}^{{C H}_{3} O H}$ $\alpha_{\mathrm{Z}}^{\mathrm{CH}_{3} \mathrm{OH}}$	$B_{∥}^{{C H}_{3} O H}$ $B^\mathrm{{CH}_{3} \mathrm{OH}}_{\\|}$	$B_{∥}^{e x - O H}$ $B_{\\|}^{\mathrm{ex}-\mathrm{OH}}$	η
features
	(ms⁻¹)		(ms⁻¹ G⁻¹)	(mG)	(mG)	(10⁻³)
G69 (M04, E06)	3.2	3 → 4	−50.955	−62.8	−4.52	5.18
W75N (M21, E02)	2.1	3 → 4	−50.955	−41.2	+7.76	35.48
		6 → 7 A	+10.067	+208.6		1.38
		7 → 8	+21.176	+99.2		6.12
W75N (M29, E02)	1.2	3 → 4	−50.955	−23.6	+7.76	108.12
		6 → 7 A	+10.067	+119.2		4.24
		7 → 8	+21.176	+56.7		18.73
W75N (M43, E02)	1.6	3 → 4	−50.955	−31.4	+7.76	61.08
		6 → 7 A	+10.067	+158.9		2.38
		7 → 8	+21.176	+75.6		10.54
W75N (M43, E01)	1.6	3 → 4	−50.955	−31.4	+6.88	48.01
		6 → 7 A	+10.067	+158.9		1.87
		7 → 8	+21.176	+75.6		8.29

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