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• Transitions: CH3OH_6(II)
  

• Abstract

  The first detection is reported of very strong maser emission in the 6.6 GHz (51) yields (60) A exp + transition of methanol toward a large number of star-forming regions. Essentially all 6.6 GHz maser sources found are associated with interstellar OH masers. Toward a number of sources, the 6.6 GHz emission has flux densities of several thousand Jy, exceeding that of any known OH maser. Since all known masers in the 12 GHz (20) yields (3-1)E transition that are observationally accessible have been found to have 6.6 GHz counterparts, the latter line is undoubtedly a Class-II methanol-maser transition. In all cases the 6.6 GHz luminosity exceeds the 12 GHz luminosity, often by large factors. Toward Class-I methanol maser regions, the 6.6 GHz line is observed in absorption, as has been predicted by pumping models for this variety of source.

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	Vpeak	Fpeak	Telescope	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)			CH3OH (class II)	(km/s)	(Jy)		(arcsec)	Yes/No		(kpc)
1	02 27 3.8	+61 52 24.6	133.9473	1.0642	G133.949+1.064	W3(OH)	6.6 GHz (II);	-48	3880	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
2	05 39 12.9	+35 45 54	173.4808	2.4461	G173.481+2.446	S231	6.6 GHz (II);	-17	208	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
3	05 39 27.6	+35 30 58	173.7182	2.3559	G173.718+2.356	173.59+02.44	6.6 GHz (II);	-14	5	GBT	300	-CH3OH I +CH3OH II	UNK		May 31 and June 3 1991
4	06 07 46.3	-06 23 8.6	213.7050	-12.6043	G213.705-12.597	Mon R2	6.6 GHz (II);	9	160	GBT	300	+H2O +CH3OH I +CH3OH II +OH	MIXED		May 31 and June 3 1991
5	06 08 35.4	+20 39 03	189.7788	0.3448	G189.778+0.345	S252A	6.6 GHz (II);	3	18	GBT	300	+H2O -CH3OH I +CH3OH II +OH	MIXED		May 31 and June 3 1991
6	06 08 53.9	+21 38 36.7	188.9454	0.8890	G188.946+0.887	S252	6.6 GHz (II);	8	457	GBT	300	+H2O +CH3OH I +CH3OH II +OH	MIXED		May 31 and June 3 1991
7	06 12 56.4	+17 59 53.8	192.5974	-0.0355	G192.599-0.048	S255	6.6 GHz (II);	3	61	GBT	300	+H2O +CH3OH I +CH3OH II	MIXED		May 31 and June 3 1991
8	06 14 36.7	+13 49 41.4	196.4520	-1.6780	G196.454-1.677	S269	6.6 GHz (II);	13	134	GBT	300	+H2O -CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
9	06 41 9.7	+09 29 34.9	203.3155	2.0549	G203.316+2.055	NGC2264	6.6 GHz (II);	~ 8	-0.07	GBT	300	+H2O +CH3OH I +CH3OH II	MIXED		May 31 and June 3 1991
10	16 56 49	-40 14 20.2	345.0135	1.7899	G345.010+1.792	345.01+1.79	6.6 GHz (II);	-25	544	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
11	17 02 58.4	-41 41 56.4	344.5821	-0.0256	G344.582-0.024	344.58-0.02	6.6 GHz (II);	~ 2	3	GBT	300	+H2O -CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
12	17 04 24.2	-40 44 7.2	345.5104	0.3476	G345.505+0.348	345.51+0.35	6.6 GHz (II);	-23	171	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
13	17 05 11.2	-41 29 05	345.0038	-0.2241	G345.003-0.223	345.00-0.22	6.6 GHz (II);	-32	148	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
14	17 06 51.3	-40 50 58.8	345.6998	-0.0914	G345.698-0.090	345.70-0.09	6.6 GHz (II);	-22	-1.2	GBT	300	+H2O -CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
15	17 19 25.8	-37 10 3.8	350.1137	0.0943	G350.105+0.085	350.11+0.09	6.6 GHz (II);	-76	43	GBT	300	+H2O -CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
16	17 19 55.9	-35 57 45.6	351.1591	0.7022	G351.161+0.699	NGC6334-B	6.6 GHz (II);	-12	13	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
17	17 20 6.6	-38 57 18	348.7250	-1.0387	G348.720-1.039	RCW122	6.6 GHz (II);	-18	98	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
18	17 20 17.9	-35 54 58	351.2396	0.6681	G351.240+0.671	NGC6334-C	6.6 GHz (II);	-6	-2.8	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
19	17 20 53.4	-35 47 1.5	351.4170	0.6450	G351.417+0.645	NGC6334-F	6.6 GHz (II);	-15	3910	GBT	300	+H2O +CH3OH I +CH3OH II +OH	MIXED		May 31 and June 3 1991
20	17 30 17.1	-33 13 54.7	354.6150	0.4719	G354.615+0.472	354.61+0.48	6.6 GHz (II);	-26	191	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
21	17 30 26.2	-34 41 36.2	353.4120	-0.3587	G353.410-0.360	353.41-0.36	6.6 GHz (II);	-23	96	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
22	17 33 28.5	-32 47 56.9	355.3431	0.1492	G355.344+0.148	355.34+0.15	6.6 GHz (II);	9	15	GBT	300	+H2O -CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
23	17 43 26.3	-29 39 31.3	359.1354	0.0275	G359.137+0.031	359.14+0.03	6.6 GHz (II);	5	18	GBT	300	+H2O -CH3OH I +CH3OH II +OH	MIXED		May 31 and June 3 1991
24	17 44 39.7	-29 28 18	359.4341	-0.1012	G359.4363-0.1033	359.43-0.10	6.6 GHz (II);	-53	29	GBT	300	+H2O +CH3OH I +CH3OH II +OH	MIXED		May 31 and June 3 1991
25	17 45 38.2	-29 03 27.7	359.8982	-0.0665	G359.8928-0.0671	Sgr A-F	6.6 GHz (II);	-13	-1.7	GBT	300	+H2O +CH3OH I +CH3OH II			May 31 and June 3 1991
26	17 45 41.3	-29 23 40.5	359.6165	-0.2516	G359.615-0.243	359.62-0.25	6.6 GHz (II);	14	39	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
27	17 45 52	-28 59 26.7	359.9815	-0.0745	G359.9815-0.0745	Sgr A-A	6.6 GHz (II);	11	-3.8	GBT	300	+CH3OH I +CH3OH II	MIXED		May 31 and June 3 1991
28	17 47 20.5	-28 23 19.2	0.6640	-0.0383	G0.6667-0.0344	Sgr B2	6.6 GHz (II);	46	53	GBT	300	+H2O +CH3OH I +CH3OH II			May 31 and June 3 1991
29	17 50 14.7	-28 54 50.6	0.5421	-0.8550	G0.546-0.852	0.54-0.85	6.6 GHz (II);	8	86	GBT	300	+H2O +CH3OH I +CH3OH II	SFR		May 31 and June 3 1991
30	17 50 36.9	-27 05 48.9	2.1443	0.0062	G2.143+0.009	2.14+0.01	6.6 GHz (II);	55	11	GBT	300	+H2O -CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
31	17 54 41.4	-25 34 49	3.9143	-0.0078	G3.910+0.001	3.91-0.01	6.6 GHz (II);	~ 18	2?	GBT	300	+H2O -CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
32	18 06 14.8	-20 31 40.2	9.6194	0.1942	G9.621+0.195	9.62+0.19	6.6 GHz (II);	4	4870	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
33	18 06 19.2	-21 37 37.9	8.6682	-0.3573	G8.669-0.357	8.67-0.37	6.6 GHz (II);	38	117	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
34	18 08 38.4	-19 51 51.7	10.4723	0.0263	G10.472+0.027	W31(1)	6.6 GHz (II);	57	823	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
35	18 10 28.5	-19 55 48.7	10.6233	-0.3830	G10.623-0.383	10.62-0.38	6.6 GHz (II);	-10	4	GBT	300	+H2O +CH3OH I +CH3OH II +OH	MIXED		May 31 and June 3 1991
36	18 11 51.3	-17 31 28.5	12.8887	0.4898	G12.889+0.490	12.89+0.49	6.6 GHz (II);	32	75	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
37	18 12 3.6	-18 31 52.7	12.0294	-0.0369	G12.025-0.032	12.03-0.04	6.6 GHz (II);	105	98	GBT	300	-H2O -CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
38	18 12 14.5	-18 41 37.9	11.9076	-0.1528	G11.904-0.141	11.91-0.15	6.6 GHz (II);	39	77	GBT	300	+H2O -CH3OH I +CH3OH II +OH	MIXED		May 31 and June 3 1991
39	18 12 41	-18 24 21	12.2105	-0.1064	G12.209-0.107	12.22-0.12	6.6 GHz (II);	16	23	GBT	300	+H2O +CH3OH I +CH3OH II			May 31 and June 3 1991
40	18 13 54.8	-18 01 45.6	12.6810	-0.1824	G12.681-0.182	W33B	6.6 GHz (II);	49	456	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
41	18 14 01	-18 53 25.2	11.9366	-0.6159	G11.937-0.616	11.94-0.62	6.6 GHz (II);	30	46	GBT	300	+H2O +CH3OH I +CH3OH II	SFR		May 31 and June 3 1991
42	18 14 11.1	-17 55 57.4	12.7968	-0.1928	G12.797-0.193	W33	6.6 GHz (II);	31	5	GBT	300	+H2O +CH3OH I +CH3OH II	SFR		May 31 and June 3 1991
43	18 14 39.5	-17 52 0.3	12.9085	-0.2602	G12.908-0.260	W33A	6.6 GHz (II);	35	327	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
44	18 21 11.4	-14 31 51.7	16.5887	-0.0590	G16.585-0.051	16.59-0.06	6.6 GHz (II);	56	22	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
45	18 24 37	-12 51 20.7	18.4587	-0.0081	G18.461-0.004	18.46-0.01	6.6 GHz (II);	46	28	GBT	300	+H2O -CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
46	18 25 58.1	-11 52 43.7	19.4767	0.1564	G19.485+0.151	19.48+0.16	6.6 GHz (II);	13	24	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
47	18 27 42.8	-11 14 29.1	20.2398	0.0751	G20.237+0.065	20.24+0.08	6.6 GHz (II);	69	112	GBT	300	+H2O -CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
48	18 28 10.3	-11 28 49.1	20.0805	-0.1354	G20.081-0.136	20.08-0.13	6.6 GHz (II);	43	4	GBT	300	+H2O +CH3OH I +CH3OH II			May 31 and June 3 1991
49	18 31 1.4	-09 48 51.7	21.8814	0.0166	G21.880+0.014	21.88+0.02	6.6 GHz (II);	20	14	GBT	300	+H2O -CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
50	18 32 45.8	-09 24 43.1	22.4365	-0.1778	G22.435-0.169	22.44-0.18	6.6 GHz (II);	24	24	GBT	300	+H2O -CH3OH I +CH3OH II			May 31 and June 3 1991
51	18 34 39.5	-08 31 51.9	23.4340	-0.1870	G23.437-0.184	23.43-0.19	6.6 GHz (II);	95	85	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
52	18 34 41	-09 00 52.8	23.0075	-0.4151	G23.010-0.411	23.01-0.41	6.6 GHz (II);	70	439	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
53	18 35 14.9	-07 35 56.3	24.3287	0.1126	G24.329+0.113	24.33+0.11	6.6 GHz (II);	107	3	GBT	300	-CH3OH I +CH3OH II	SFR		May 31 and June 3 1991
54	18 36 12.8	-07 12 35.1	24.7842	0.0794	G24.790+0.083	W42c	6.6 GHz (II);	106	89	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
55	18 41 55.6	-05 03 38.4	27.3453	-0.1973	G27.345-0.197	27.35-0.20	6.6 GHz (II);	96	12	GBT	300	-CH3OH I +CH3OH II	EVOLVED		May 31 and June 3 1991
56	18 43 0.3	-04 13 24.7	28.2125	-0.0532	G28.200-0.050	28.21-0.05	6.6 GHz (II);	95	2	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
57	18 44 50.5	-03 45 58.8	28.8286	-0.2520	G28.833-0.253	28.83-0.25	6.6 GHz (II);	80	85	GBT	300	+H2O +CH3OH I +CH3OH II	SFR		May 31 and June 3 1991
58	18 46 04	-02 39 21.5	29.9560	-0.0168	G29.956-0.016	29.95-0.02'c	6.6 GHz (II);	95	229	GBT	300	+H2O +CH3OH I +CH3OH II	MIXED		May 31 and June 3 1991
59	18 46 36.3	-01 45 12.1	30.8206	0.2753	G30.819+0.273	30.82+0.28	6.6 GHz (II);	82	4	GBT	300	-H2O -CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
60	18 47 0.6	-02 28 41.4	30.2219	-0.1456	G30.233-0.144	30.22-0.15	6.6 GHz (II);	103	11	GBT	300	+H2O -CH3OH I +CH3OH II -SiO	MIXED		May 31 and June 3 1991
61	18 47 21.2	-02 05 54.9	30.5987	-0.0486	G30.589-0.043	30.60-0.06	6.6 GHz (II);	40	5	GBT	300	+H2O -CH3OH I +CH3OH II +OH	MIXED		May 31 and June 3 1991
62	18 47 35	-02 01 5.9	30.6964	-0.0631	G30.702-0.068	30.70-0.06	6.6 GHz (II);	85	125	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
63	18 47 44.8	-01 55 50.2	30.7930	-0.0595	G30.793-0.059	30.79-0.06	6.6 GHz (II);	88	25	GBT	300	-CH3OH I +CH3OH II	SFR		May 31 and June 3 1991
64	18 47 47	-01 54 35.1	30.8157	-0.0580	G30.817-0.057	30.82-0.06'c	6.6 GHz (II);	90	21	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
65	18 48 12.2	-01 25 48.3	31.2906	0.0672	G31.280+0.062	W43M	6.6 GHz (II);	104	87	GBT	300	+H2O +CH3OH I +CH3OH II +OH	MIXED		May 31 and June 3 1991
66	18 51 20	-00 11 50.8	32.7443	-0.0669	G32.744-0.076	32.74-0.07	6.6 GHz (II);	28	46	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
67	18 52 7.3	+00 08 5.5	33.1298	-0.0905	G33.133-0.092	33.13-0.09	6.6 GHz (II);	72	10	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
68	18 53 18.6	+01 14 57.7	34.2572	0.1532	G34.257+0.153	34.26+0.15	6.6 GHz (II);	55	32	GBT	300	+H2O +CH3OH I +CH3OH II +OH	MIXED		May 31 and June 3 1991
69	18 54 1.8	+02 01 18.8	35.0268	0.3453	G35.025+0.350	35.03+0.35	6.6 GHz (II);	44	50	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
70	18 58 12.7	+01 40 36.5	35.1966	-0.7419	G35.197-0.743	35.19-0.74c	6.6 GHz (II);	27	107	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
71	19 01 46.2	+01 13 41.5	35.2038	-1.7380	G35.200-1.737	35.20-0.73	6.6 GHz (II);	39	556	GBT	300	+H2O +CH3OH I +CH3OH II +OH	MIXED		May 31 and June 3 1991
72	19 06 1.1	+06 46 34.7	40.6212	-0.1366	G40.623-0.138	40.62-0.14	6.6 GHz (II);	30	14	GBT	300	+H2O -CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
73	19 10 13.5	+09 06 11.4	43.1662	0.0106	G43.167+0.011	W49N	6.6 GHz (II);	-2	28	GBT	300	+H2O +CH3OH I +CH3OH II +OH	MIXED		May 31 and June 3 1991
74	19 11 53.9	+09 35 51.4	43.7954	-0.1267	G43.795-0.127	43.80-0.13	6.6 GHz (II);	39	152	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
75	19 13 22.1	+10 50 53.5	45.0712	0.1323	G45.071+0.132	45.07+0.13	6.6 GHz (II);	57	42	GBT	300	+H2O +CH3OH I +CH3OH II +OH -SiO	SFR		May 31 and June 3 1991
76	19 14 8.8	+11 12 27.8	45.4783	0.1300	G45.476+0.130	45.47+0.13	6.6 GHz (II);	57	15	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
77	19 14 25.7	+11 09 25.9	45.4658	0.0451	G45.465+0.053	45.47+0.05	6.6 GHz (II);	55	3	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
78	19 23 42.1	+14 30 41.3	49.4879	-0.3800	G49.488-0.387	W51'c	6.6 GHz (II);	48	979	GBT	300	+H2O +CH3OH I +CH3OH II +OH -SiO	SFR		May 31 and June 3 1991
79	19 43 11.6	+23 43 54	59.7811	0.0623	G59.783+0.064	V645 Cyg	6.6 GHz (II);	15	103	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
80	20 10 9.2	+31 31 35.4	69.5403	-0.9762	G69.540-0.976	ON1C	6.6 GHz (II);	-1	91	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
81	20 21 42.6	+37 26 7.6	75.7726	0.3418	G75.773+0.343	ON2C	6.6 GHz (II);	-11	54	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
82	20 39 0.7	+42 22 50.8	81.7216	0.5722	G81.711+0.563	DR21(OH)C	6.6 GHz (II);	-7	13	GBT	300	+H2O +CH3OH I +CH3OH II +OH -SiO	SFR		May 31 and June 3 1991
83	20 39 3.5	+42 25 53	81.7670	0.5961	G81.767+0.596	W75S(3)C	6.6 GHz (II);	-7	39	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
84	22 56 18.1	+62 01 49.3	109.8713	2.1141	G109.871+2.114	Cep A	6.6 GHz (II);	-6	1420	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991
85	23 13 45.3	+61 28 10.7	111.5421	0.7770	G111.542+0.769	NGC7538C	6.6 GHz (II);	-62	346	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR		May 31 and June 3 1991

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	Fpeak	Telescope	Beam	Detection	Class	Date
	(J2000)	(J2000)	(deg.)	(deg.)			CH3OH (class II)	(Jy)		(arcsec)	Yes/No
1	17 26 42.9	-36 09 18.4	351.7751	-0.5375	G351.775-0.537	351.78-0.54	6.6 GHz (II);	246	GBT	300	+H2O +CH3OH I +CH3OH II +OH	SFR	May 31 and June 3 1991
2	20 38 36.8	+42 37 59.5	81.8775	0.7838	G81.876+0.782	W75NC	6.6 GHz (II);	1080	GBT	300	+H2O +CH3OH I +CH3OH II		May 31 and June 3 1991

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DSS colored 2MASS colored WISE colored SDSS color IRAC color I1,I2,I4 GLIMPSE 360 PACS color (70-160 um) SPIRE color (250-500 um) NVSS (1.4GHz) ATLASGAL 870 um ATLASGAL 870 um + Planck Bolocam 1.1 mm UKIDSS K Download UKIDSS K FITS 2MASS K Download 2MASS K FITS