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• Target type: H2O,OH
  Transitions: OH_1667
  

• Abstract

  The absolute positions of about 70 OH/H2O masers associated with star-forming regions were determined, using VLA, to an estimated accuracy of about 0.5 arcsec rms. The extent and displacement of OH and H2O maser emission, and the spatial relationship of the masers and compact H II regions for the sample as a whole are discussed. The observations show that the OH and H2O molecular species generally occur close together and in compact groups less than about 30 mpc in diameter. While the complex OH/H2O maser associations may be interpreted either as a dense cluster of young stars or as a collection of masing molecular clumps associated with a single star, it is argued that the latter is probably the case. A scenario for star formation is suggested, which places various types of maser associations in an evolutionary sequence.

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Other name	Frequency	Vpeak	Fpeak	Telescope	RMS	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)			Pol	(MHz)	(km/s)	(Jy)		(Jy)	(arcsec)	Yes/No		(kpc)
1	16 52 4.6	-46 08 29.5	339.8849	-1.2578	G339.884-1.259	339.88-1.26	R	1667	-29	16.2	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
2	16 48 13.8	-45 21 41.9	340.0546	-0.2431	G340.054-0.244	340.06-0.24	R	1667	-53.8	10.2	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
3	16 52 17.8	-44 26 51.5	341.2178	-0.2116	G341.218-0.212	341.22-0.21	R	1667	-37.6	4.5	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
4	16 58 17.2	-42 52 8.9	343.1264	-0.0631	G343.122-0.064	343.13-0.06	L	1667	-31.8	72	NRAOVLA	0.100	5	+H2O +CH3OH I -CH3OH II +OH	SFR		December 1983
5	17 04 7.8	-42 18 39.2	344.2276	-0.5687	G344.228-0.569	344.23-0.57	R	1667	-30.9	1	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
6	17 02 57.8	-41 41 54	344.5815	-0.0237	G344.582-0.024	344.58-0.02	R	1667	-2.3	15	NRAOVLA	0.100	5	+H2O -CH3OH I +CH3OH II +OH	SFR		December 1983
7	17 05 11.3	-41 29 5.6	345.0038	-0.2243	G345.003-0.224	345.00-0.22	R	1667	-25.3	2.8	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
8	16 56 47.6	-40 14 26.7	345.0093	1.7923	G345.010+1.792	345.01+1.79	L	1667	-22.9	15.7	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
9	17 09 35.5	-41 35 55.6	345.4072	-0.9517	G345.407-0.951	345.41-0.95	L	1667	-17.8	1	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
10	17 04 22.9	-40 44 22.6	345.5045	0.3482	G345.505+0.348	345.51+0.35	R	1667	-19.6	8.7	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
11	17 06 50.6	-40 51 01	345.6979	-0.0900	G345.698-0.090	345.70-0.09	L	1667	-6	7.2	NRAOVLA	0.100	5	+H2O -CH3OH I +CH3OH II +OH	SFR		December 1983
12	17 11 51.1	-39 09 25.4	347.6291	0.1487	G347.628+0.148	347.63+0.15	L	1667	-94.4	4.6	NRAOVLA	0.100	5	+H2O +CH3OH II +OH	SFR		December 1983
13	17 19 20.4	-39 03 54.3	348.5492	-0.9793	G348.550-0.979	348.55-0.98	R	1667	-19.9	2.3	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
14	17 20 4.1	-38 58 31	348.7037	-1.0437	G348.704-1.039	348.70-1.04	R	1667	-11.6	0.7	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH			December 1983
15	17 15 50.1	-38 10 12	348.8847	0.0965	G348.885+0.096	348.89+0.10	R	1667	-73.2	2.4	NRAOVLA	0.100	5	+H2O +CH3OH II +OH	SFR		December 1983
16	17 17 0.2	-38 19 26.6	348.8921	-0.1795	G348.892-0.180	348.89-0.18	R	1667	9.9	1.2	NRAOVLA	0.100	5	+H2O +CH3OH II +OH	SFR		December 1983
17	17 16 50.7	-38 05 14	349.0673	-0.0172	G349.067-0.017	349.07-0.02	R	1667	14.9	2.3	NRAOVLA	0.100	5	+H2O +CH3OH II +OH	SFR		December 1983
18	17 16 24.7	-37 59 43.9	349.0925	0.1056	G349.092+0.106	349.09+0.11	L	1667	-81.5	1.9	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
19	17 17 45.5	-37 03 13.5	350.0151	0.4327	G350.015+0.433	350.02+0.43	L	1667	-33.1	1.1	NRAOVLA	0.100	5	+H2O +CH3OH II +OH	SFR_MIXED		December 1983
20	17 19 25.7	-37 10 5.7	350.1130	0.0945	G350.110+0.089	350.11+0.09	R	1667	-71.1	31.8	NRAOVLA	0.100	5	+H2O -CH3OH I +CH3OH II +OH			December 1983
21	17 19 57.4	-35 57 52.1	351.1605	0.6971	G351.161+0.697	351.16+0.70	R	1667	-6	35.7	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR_MIXED		December 1983
22	17 20 53.5	-35 46 59.6	351.4174	0.6452	G351.417+0.645	351.42+0.64	L	1667	-9.5	8.6	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR_MIXED		December 1983
23	17 25 25.4	-36 12 43.7	351.5819	-0.3532	G351.581-0.353	351.58-0.35	R	1667	-92.8	7.8	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
24	17 26 42.5	-36 09 17.7	351.7745	-0.5364	G351.775-0.536	351.78-0.54	R	1667	-2	81	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
25	17 27 11.3	-35 19 31.7	352.5174	-0.1548	G352.517-0.155	352.52-0.15	R	1667	-48.6	0.8	NRAOVLA	0.100	5	+H2O +CH3OH II +OH	SFR		December 1983
26	17 30 26.2	-34 41 45.7	353.4099	-0.3603	G353.410-0.360	353.41-0.36	L	1667	-20	1.3	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
27	17 26 51.6	-34 08 25.2	353.4638	0.5618	G353.464+0.562	353.46+0.56	R	1667	-44.3	1	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
28	17 30 17.1	-33 13 53.8	354.6151	0.4720	G354.615+0.472	354.61+0.47	R	1667	-15.7	2.4	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR_MIXED		December 1983
29	17 33 29.1	-32 47 58.5	355.3438	0.1472	G355.344+0.147	355.34+0.15	L	1667	18.2	9.6	NRAOVLA	0.100	5	+H2O -CH3OH I +CH3OH II +OH	SFR		December 1983
30	17 40 54.1	-30 22 37.9	358.2354	0.1151	G358.235+0.115	358.23+0.11	R	1667	-27.2	2.8	NRAOVLA	0.100	5	+H2O +OH +SiO	EVOLVED		December 1983
31	17 43 25.7	-29 39 17.4	359.1375	0.0315	G359.137+0.031	359.14+0.03	R	1667	-1.7	5.1	NRAOVLA	0.100	5	-CH3OH I +CH3OH II +OH	SFR_MIXED		December 1983
32	17 44 40.6	-29 28 16.7	359.4360	-0.1036	G359.4363-0.1033	359.44-0.10	L	1667	-51.6	4.6	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR_MIXED		December 1983
33	17 45 39.1	-29 23 29.9	359.6149	-0.2433	G359.615-0.243	359.62-0.25	R	1667	22.4	2.3	NRAOVLA	0.100	5	+CH3OH I +CH3OH II +OH	SFR		December 1983
34	17 47 20.2	-29 11 58.7	359.9698	-0.4574	G359.970-0.457	359.97-0.46	L	1667	14.5	13	NRAOVLA	0.100	5	-CH3OH I +CH3OH II +OH	SFR_MIXED		December 1983
35	17 46 21.4	-28 35 39.8	0.3759	0.0400	G0.3758+0.0401	0.38+0.04	R	1667	35.4	2.2	NRAOVLA	0.100	5	+H2O +CH3OH II +OH	SFR		December 1983
36	17 50 14.5	-28 54 31.8	0.5462	-0.8517	G0.546-0.852	0.55-0.85	R	1667	19.2	2.3	NRAOVLA	0.100	5	+CH3OH I +CH3OH II +OH	SFR_MIXED		December 1983
37	17 50 36.1	-27 05 47.1	2.1432	0.0090	G2.143+0.009	2.14+0.01	R	1667	59.4	2.8	NRAOVLA	0.100	5	+H2O -CH3OH I +CH3OH II +OH	SFR		December 1983
38	17 54 38.8	-25 34 44.7	3.9105	0.0012	G3.910+0.001	3.91+0.00	R	1667	17.7	4.1	NRAOVLA	0.100	5	+H2O -CH3OH I +CH3OH II +OH	SFR		December 1983
39	18 00 30.3	-24 04 4.1	5.8844	-0.3925	G5.885-0.392	5.88-0.39	L	1667	13.7	5.4	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	GALAXY		December 1983
40	18 06 19.1	-21 37 31.5	8.6696	-0.3561	G8.669-0.356	8.67-0.36	L	1667	41.1	1.7	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
41	18 06 14.7	-20 31 31.2	9.6213	0.1959	G9.621+0.195	9.62+0.20	R	1667	1.2	7.9	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
42	18 10 28.7	-19 55 49.1	10.6236	-0.3836	G10.623-0.384	10.62-0.38	L	1667	-2.2	6.7	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR_MIXED		December 1983
43	18 09 39.9	-19 21 21.2	11.0339	0.0616	G11.034+0.062	11.03+0.06	R	1667	21.2	3.7	NRAOVLA	0.100	5	+H2O -CH3OH I +CH3OH II +OH	SFR		December 1983
44	18 12 11.6	-18 41 29.6	11.9041	-0.1416	G11.904-0.141	11.90-0.14	L	1667	40.5	6.6	NRAOVLA	0.100	5	+H2O -CH3OH I +CH3OH II +OH	SFR_MIXED		December 1983
45	18 12 44.5	-18 24 24.6	12.2162	-0.1189	G12.209-0.107	12.22-0.12	R	1667	26.8	0.8	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
46	18 13 54.9	-18 01 45.2	12.6812	-0.1825	G12.681-0.182	12.68-0.18	L	1667	61.5	1.5	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
47	18 14 39.5	-17 52 0.3	12.9085	-0.2603	G12.908-0.260	12.91-0.26	R	1667	35.2	3.4	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
48	18 20 24.7	-16 11 34.9	15.0344	-0.6769	G15.034-0.674	15.03-0.68	R	1667	21.5	2.9	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	GALAXY		December 1983
49	18 21 9.2	-14 31 48.4	16.5854	-0.0510	G16.585-0.051	16.59-0.05	L	1667	58.9	2.2	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
50	18 27 16.8	-11 53 41	19.6122	-0.1351	G19.612-0.134	19.61-0.13	R	1667	53	1	NRAOVLA	0.100	5	+H2O -CH3OH I +CH3OH II +OH	SFR		December 1983
51	18 27 38.1	-11 56 36.5	19.6094	-0.2345	G19.609-0.234	19.61-0.23	R	1667	41.5	4.1	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
52	18 34 40.3	-09 00 37.5	23.0099	-0.4104	G23.010-0.410	23.01-0.41	R	1667	65.7	3.3	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH			December 1983
53	18 34 39.3	-08 31 39.6	23.4365	-0.1844	G23.437-0.184	23.44-0.18	R	1667	106	4.5	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
54	18 36 12.5	-07 12 10.6	24.7897	0.0837	G24.790+0.083	24.79+0.08	R	1667	107.2	2.7	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
55	18 43 46.3	-03 35 29.9	28.8621	0.0652	G28.862+0.066	28.86+0.07	L	1667	102.8	9.9	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
56	18 48 56.7	-01 36 42.5	31.2133	-0.1804	G31.213-0.180	31.21-0.18	L	1667	-29.5	0.5	NRAOVLA	0.100	5	+H2O +OH	SFR_MIXED		December 1983
57	18 48 45.1	-01 33 13.3	31.2430	-0.1109	G31.243-0.111	31.24-0.11	L	1667	21.1	3.5	NRAOVLA	0.100	5	+H2O -CH3OH I -CH3OH II +OH	SFR		December 1983
58	18 48 12.5	-01 26 30	31.2807	0.0611	G31.280+0.062	31.28+0.06	L	1667	107.2	2.3	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR_MIXED		December 1983
59	18 51 21.9	-00 12 5.5	32.7442	-0.0756	G32.744-0.076	32.74-0.07	R	1667	32.3	1.5	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
60	18 52 08	+00 08 12.3	33.1329	-0.0924	G33.133-0.092	33.13-0.09	L	1667	78.8	8.7	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
61	18 53 18.7	+01 15 0.3	34.2581	0.1531	G34.257+0.153	34.26+0.15	L	1667	56	18.9	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR_MIXED		December 1983
62	18 54 0.7	+02 01 19.3	35.0248	0.3496	G35.025+0.350	35.03+0.35	R	1667	47.2	7.5	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
63	18 58 13	+01 40 37.7	35.1974	-0.7426	G35.197-0.743	35.20-0.74	R	1667	36.6	5.1	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
64	19 01 45.6	+01 13 33.3	35.2005	-1.7367	G35.200-1.737	35.20-1.74	L	1667	32.1	0.6	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR_MIXED		December 1983
65	18 56 22.5	+02 20 28.1	35.5782	-0.0304	G35.578-0.030	35.58-0.03	R	1667	48.9	20.2	NRAOVLA	0.100	5	+H2O -CH3OH I +CH3OH II +OH	SFR_MIXED		December 1983
66	19 06 1.6	+06 46 36.5	40.6226	-0.1383	G40.623-0.138	40.62-0.14	R	1667	29.4	1.1	NRAOVLA	0.100	5	+H2O -CH3OH I +CH3OH II +OH	SFR		December 1983
67	19 11 54	+09 35 50.8	43.7956	-0.1274	G43.795-0.127	43.80-0.13	L	1667	41.1	41	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
68	19 13 22.1	+10 50 54.1	45.0714	0.1323	G45.071+0.132	45.07+0.13	R	1667	56.4	30	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH -SiO	SFR		December 1983
69	19 14 7.4	+11 12 16.5	45.4730	0.1334	G45.475+0.132	45.47+0.13	L	1667	59	7.1	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH			December 1983
70	19 14 25.7	+11 09 25.8	45.4657	0.0452	G45.466+0.053	45.47+0.05	R	1667	68.2	11.6	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH	SFR		December 1983
71	19 20 31.3	+13 55 26	48.6065	0.0229	G48.606+0.024	48.61+0.02	R	1667	19.5	3.5	NRAOVLA	0.100	5	+H2O -CH3OH I -CH3OH II +OH	SFR_MIXED		December 1983
72	19 23 44	+14 30 30.3	49.4888	-0.3882	G49.489-0.387	49.49-0.39	R	1667	58.6	38.2	NRAOVLA	0.100	5	+H2O +CH3OH I +CH3OH II +OH -SiO	SFR		December 1983

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	Telescope	RMS	Beam	Detection	Class	Date
	(J2000)	(J2000)	(deg.)	(deg.)			OH		(Jy)	(arcsec)	Yes/No
1	18 16 26	-16 39 56.2	14.1664	-0.0603	G14.166-0.060	14.17-0.06	1.667 GHz;	NRAOVLA	0.100	5	+H2O +OH +SiO	EVOLVED	December 1983

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