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 A.3

Parameters of the 6.7 GHz CH₃OH maser features detected in G 81.871+0.781 (W75N).

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)	(11)	(12)	(13)
Maser	RA^a	Dec^a	Peak	V_LSR	(Δ_{v_L}	$P_{1}^{b}$ $P_{1}^{b}$	χ^b	$Δ V_{i}^{c}$ $\Delta V_{\mathrm{i}}^{c}$	$T_{b} Δ Ω^{c}$ $T_{\mathrm{b}} \Delta \Omega^{c}$	P_V	Δ V_Z	θ^d
	offset	offset	Intensity (I)
	(mas)	(mas)	(Jy beam ⁻¹)	(kms⁻¹)	kms⁻¹)	(%)	°	(km s⁻¹)	(log K sr)	(%)	(m s⁻¹)	(°)
W75N.M01	−278.842	−402.912	0.040 ± 0.004	6.48	0.60	–	–	–	–	–	–	–
W75N.M02	−246.549	−236.130	0.132 ± 0.009	3.85	0.38	–	–	–	–	–	–	–
W75N.M03	−232.319	−226.574	0.039 ± 0.004	6.31	0.45	–	–	–	–	–	–	–
W75N.M04	−261.454	−251.808	0.273 ± 0.015	3.98	0.22	–	–	–	–	–	–	–
W75N.M05	−215.057	−177.788	0.099 ± 0.009	5.60	0.26	–	–	–	–	–	–	–
W75N.M06	−206.384	−184.334	0.083 ± 0.004	6.48	0.24	–	–	–	–	–	–	–
W75N.M07	−203.816	−346.684	0.057 ± 0.004	6.70	0.27	–	–	–	–	–	–	–
W75N.M08	−79.362	−77.820	0.397 ± 0.007	5.47	0.22	–	–	–	–	–	–	–
W75N.M09	−77.678	−71.812	1.299 ± 0.015	5.69	0.20	–	–	–	–	–	–	–
W75N.M10	−62.985	−66.975	12.001 ± 0.031	5.82	0.23	10.9 ± 1.5	−10 ± 1	${0.4}_{- 0.2}^{+ 0.1}$ $0.4_{-0.2}^{+0.1}$	${10.1}_{- 1.0}^{+ 0.1}$ $10.1_{-1.0}^{+0.1}$	–	–	$90_{- 7}^{+ 7}$ $90_{-7}^{+7}$
W75N.M11	−44.670	−81.238	7.285 ± 0.028	5.21	0.24	11.7 ± 0.5	−18 ± 2	${0.4}_{- 0.1}^{+ 0.1}$ $0.4_{-0.1}^{+0.1}$	${10.3}_{- 0.2}^{+ 0.1}$ $10.3_{-0.2}^{+0.1}$	–	–	$90_{- 4}^{+ 4}$ $90_{-4}^{+4}$
W75N.M12	−39.871	−80.288	3.693 ± 0.017	5.12	0.25	13.4 ± 2.1	−15 ± 3	${0.5}_{- 0.3}^{+ 0.2}$ $0.5_{-0.3}^{+0.2}$	${10.2}_{- 1.1}^{+ 0.2}$ $10.2_{-1.1}^{+0.2}$	–	–	$90_{- 7}^{+ 7}$ $90_{-7}^{+7}$
W75N.M13	−35.997	30.689	1.530 ± 0.014	4.33	0.21	–	–	–	–	–	–	–
W75N.M14	−29.808	−71.411	2.092 ± 0.027	5.21	0.37	13.0 ± 1.2	−15 ± 8	${0.5}_{- 0.1}^{+ 0.3}$ $0.5_{-0.1}^{+0.3}$	${10.8}_{- 0.2}^{+ 0.1}$ $10.8_{-0.2}^{+0.1}$	–	–	$90_{- 8}^{+ 8}$ $90_{-8}^{+8}$
W75N.M15	−25.977	36.072	0.960 ± 0.012	4.46	0.19	–	–	–	–	–	–	–
W75N.M16	−25.388	−916.046	3.827 ± 0.011	9.51	0.22	12.9 ± 0.6	−15 ± 1	${0.4}_{- 0.1}^{+ 0.1}$ $0.4_{-0.1}^{+0.1}$	${10.1}_{- 0.2}^{+ 0.1}$ $10.1_{-0.2}^{+0.1}$	–	–	$90_{- 4}^{+ 4}$ $90_{-4}^{+4}$
W75N.M17	−16.841	45.914	0.493 ± 0.012	4.42	0.21	–	–	–	–	–	–	–
W75N.M18	−14.904	66.551	0.512 ± 0.013	4.42	0.19	–	–	–	–	–	–	–
W75N.M19	−10.189	−63.904	0.166 ± 0.009	6.00	0.23	–	–	–	–	–	–	–
W75N.M20	−7.157	−56.038	0.322 ± 0.008	5.47	0.30	–	–	–	–	–	–	–
W75N.M21	0.000	0.000	25.899 ± 0.051	4.64	0.19	9.4 ± 0.5	−16 ± 1	${0.4}_{- 0.1}^{+ 0.1}$ $0.4_{-0.1}^{+0.1}$	${10.0}_{- 0.1}^{+ 0.1}$ $10.0_{-0.1}^{+0.1}$	0.9	1.2 ± 0.2	$90_{- 5}^{+ 5}$ $90_{-5}^{+5}$
W75N.M22	0.632	−58.525	0.047 ± 0.004	6.18	0.87	–	–	–	–	–	–	–
W75N.M23	8.294	−21.351	0.497 ± 0.014	4.99	1.95	–	–	–	–	–	–	–
W75N.M24	9.431	−53.616	0.074 ± 0.004	5.17	1.98	–	–	–	–	–	–	–
W75N.M25	17.388	30.617	0.499 ± 0.015	3.94	0.89	–	–	–	–	–	–	–
W75N.M26	17.472	27.020	0.166 ± 0.013	4.38	0.23	–	–	–	–	–	–	–
W75N.M27	31.703	−1.568	0.760 ± 0.028	5.21	0.23	–	–	–	–	–	–	–
W75N.M28	36.797	6.535	0.334 ± 0.015	5.30	0.21	–	–	–	–	–	–	–
W75N.M29	37.008	46.204	17.471 ± 0.047	4.11	0.21	7.6 ± 0.4	−7 ± 4	${0.4}_{- 0.1}^{+ 0.1}$ $0.4_{-0.1}^{+0.1}$	${10.1}_{- 0.2}^{+ 0.1}$ $10.1_{-0.2}^{+0.1}$	1.4	2.1 ± 0.3	$90_{- 6}^{+ 6}$ $90_{-6}^{+6}$
W75N.M30	39.534	13.592	0.570 ± 0.016	5.34	0.22	–	–	–	–	–	–	–
W75N.M31	42.481	−2.518	0.568 ± 0.021	3.45	0.22	–	–	–	–	–	–	–
W75N.M32	42.818	53.776	4.600 ± 0.041	4.07	0.22	8.5 ± 1.2	−28 ± 13	${0.4}_{- 0.1}^{+ 0.4}$ $0.4_{-0.1}^{+0.4}$	${10.1}_{- 0.6}^{+ 0.1}$ $10.1_{-0.6}^{+0.1}$	–	–	$90_{- 9}^{+ 9}$ $90_{-9}^{+9}$
W75N.M33	47.954	3.777	1.696 ± 0.011	3.37	0.19	6.8 ± 0.5	+4 ± 6	${0.4}_{- 0.1}^{+ 0.2}$ $0.4_{-0.1}^{+0.2}$	${9.9}_{- 0.3}^{+ 0.1}$ $9.9_{-0.3}^{+0.1}$	–	–	$90_{- 7}^{+ 7}$ $90_{-7}^{+7}$
W75N.M34	66.563	−859.219	1.586 ± 0.006	8.94	0.19	3.3 ± 1.5	−12 ± 6	${0.4}_{- 0.1}^{+ 0.2}$ $0.4_{-0.1}^{+0.2}$	${9.7}_{- 0.9}^{+ 0.2}$ $9.7_{-0.9}^{+0.2}$	–	–	$90_{- 7}^{+ 4}$ $90_{-7}^{+4}$
W75N.M35	75.699	49.385	7.693 ± 0.024	3.50	0.20	8.5 ± 1.5	−14 ± 6	${0.4}_{- 0.2}^{+ 0.1}$ $0.4_{-0.2}^{+0.1}$	${9.9}_{- 1.1}^{+ 0.1}$ $9.9_{-1.1}^{+0.1}$	–	–	$90_{- 8}^{+ 8}$ $90_{-8}^{+8}$
W75N.M36	109.339	−482.712	0.771 ± 0.010	7.05	0.19	–	–	–	–	–	–	–
W75N.M37	118.938	29.186	0.272 ± 0.018	4.24	0.25	–	–	–	–	–	–	–
W75N.M38	123.569	−393.288	10.817 ± 0.047	7.36	0.20	9.8 ± 0.9	−13 ± 6	${0.4}_{- 0.1}^{+ 0.3}$ $0.4_{-0.1}^{+0.3}$	${10.0}_{- 0.4}^{+ 0.1}$ $10.0_{-0.4}^{+0.1}$	–	–	$90_{- 6}^{+ 6}$ $90_{-6}^{+6}$
W75N.M39	126.222	−501.926	0.736 ± 0.045	7.23	0.19	–	–	–	–	–	–	–
W75N.M40	127.148	−404.903	4.089 ± 0.048	7.36	0.25	7.5 ± 1.4	−3 ± 9	${0.5}_{- 0.3}^{+ 0.2}$ $0.5_{-0.3}^{+0.2}$	${10.1}_{- 1.0}^{+ 0.1}$ $10.1_{-1.0}^{+0.1}$	–	–	$90_{- 11}^{+ 11}$ $90_{-11}^{+11}$
W75N.M41	132.748	−513.611	1.014 ± 0.025	7.23	0.21	–	–	–	–	–	–	–
W75N.M42	134.811	−406.067	3.894 ± 0.016	7.58	0.22	–	–	–	–	–	–	–
W75N.M43	136.874	−425.190	7.114 ± 0.047	7.40	0.22	9.3 ± 1.1	−29 ± 5	${0.4}_{- 0.1}^{+ 0.3}$ $0.4_{-0.1}^{+0.3}$	${10.0}_{- 0.7}^{+ 0.2}$ $10.0_{-0.7}^{+0.2}$	1.0	1.6 ± 0.3	$90_{- 7}^{+ 7}$ $90_{-7}^{+7}$
W75N.M44	137.379	−437.584	4.103 ± 0.025	7.23	0.20	8.3 ± 3.0	−41 ± 11	${0.5}_{- 0.2}^{+ 0.2}$ $0.5_{-0.2}^{+0.2}$	${9.8}_{- 1.4}^{+ 0.1}$ $9.8_{-1.4}^{+0.1}$	–	–	$90_{- 47}^{+ 47}$ $90_{-47}^{+47}$
W75N.M45	142.094	140.930	0.258 ± 0.014	4.33	0.22	–	–	–	–	–	–	–
W75N.M46	156.030	−699.806	0.202 ± 0.004	6.61	2.71	–	–	–		–	–	–
W75N.M47	167.313	−690.742	1.641 ± 0.009	7.01	0.22	8.6 ± 1.2	+5 ± 11	${0.4}_{- 0.1}^{+ 0.3}$ $0.4_{-0.1}^{+0.3}$	${10.1}_{- 0.7}^{+ 0.1}$ $10.1_{-0.7}^{+0.1}$	–	–	$90_{- 8}^{+ 8}$ $90_{-8}^{+8}$

Notes. ^aThe reference position is RA(J2000)=20^h 38^m 36.41744 ± 0^S.00008 and Dec(J2000)=+42° 37^′ 35^′′.1153 ± 0^′.0011. ^bP₁ and χ are the mean values of the linear polarization percentage and the linear polarization angle measured across the spectrum, respectively. ^cThe best-fitting results obtained by using a model based on the radiative transfer theory of CH₃OH masers for Γ+Γ_v=1 s⁻¹ (Vlemmings et al. 2010; Surcis et al. 2011a). The errors were determined by analyzing the full probability distribution function. ^dThe angle between the magnetic field and the maser propagation direction is determined by using the observed P₁ and the fitted emerging brightness temperature. The errors were determined by analyzing the full probability distribution function.

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