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• Target type: UCHII
  

• Abstract

  We present a survey in the 616-523 rotational H2O transition toward 33 Galactic ultracompact H II regions. Maser emission is detected toward 18 of these sources two are new detections. High-quality spectra are provided for all 18 sources. We discuss the detection rate of this survey and the correlation of various maser properties with other physical parameters. In addition, we report wide-bandwidth (316 km s-1), moderate-resolution (~3 arcsec) H2O maser observations of the HH 80-81 region. We report the first detection of water maser emission at the approximate velocity of the molecular core. This emission is coincident with the extreme tip of the thermal jet and well removed from the much stronger and well-known maser emission at the position of VLA 3.

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Image	Line	Vrange	Vpeak	Fpeak	∫F dv	Telescope	Vstep	RMS	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)				H2O	(km/s)	(km/s)	(Jy)	(Jy*km/s)		(km/s)	(Jy)	(arcsec)	Yes/No		(kpc)
1	18 19 12.1	-20 47 31.6	10.8412	-2.5917	G10.841-2.592	G10.84-2.59	Image	22 GHz;	-80.6;-4.2	-72.3	205.1	954.2	EFF	0.33	0.110	40	+H2O +CH3OH I +CH3OH II	SFR_MIXED		1995 September 22-24
2	18 11 31.8	-19 30 39	11.1105	-0.3985	G11.111-0.400	G11.11-0.40	Image	22 GHz;		11.8	2.7	3.7	EFF	0.33	0.110	40	+H2O -CH3OH I +CH3OH II	SFR_MIXED		1995 September 22-24
3	18 25 42.5	-13 10 21.9	18.3026	-0.3912	G18.303-0.390	G18.30-0.39	Image	22 GHz;		28.4	0.8	0.7	EFF	0.33	0.110	40	+H2O -CH3OH I -CH3OH II +OH	SFR		1995 September 22-24
4	18 34 21	-05 59 42.1	25.6497	1.0493	G25.649+1.050	G25.65+1.05	Image	22 GHz;	-15.2;-48	41.3	452.3	1142.4	EFF	0.33	0.110	40	+H2O +CH3OH I +CH3OH II +OH	SFR		1995 September 22-24
5	18 42 58.1	-04 14 4.8	28.1985	-0.0502	G28.200-0.050	G28.20-0.05	Image	22 GHz;	85.4;-99.4	94.1	2.3	6.5	EFF	0.33	0.110	40	+H2O +CH3OH I +CH3OH II +OH	SFR		1995 September 22-24
6	18 48 12	-01 26 29.3	31.2799	0.0631	G31.280+0.062	G31.28-0.06	Image	22 GHz;	80.5;-119.9	108.5	29.8	53.1	EFF	0.33	0.110	40	+H2O +CH3OH I +CH3OH II +OH	SFR_MIXED		1995 September 22-24
7	18 49 33	-01 29 3.5	31.3957	-0.2569	G31.396-0.257	G31.40-0.26	Image	22 GHz;	48.1;-97.5	91.8	8.4	24.1	EFF	0.33	0.110	40	+H2O +CH3OH I +CH3OH II +OH	SFR		1995 September 22-24
8	18 52 08	+00 08 11.6	33.1327	-0.0923	G33.133-0.092	G33.13-0.09	Image	22 GHz;	64;-88	66.1	36.6	138.2	EFF	0.33	0.110	40	+H2O +CH3OH I +CH3OH II +OH	SFR		1995 September 22-24
9	18 54 0.5	+02 01 17.7	35.0241	0.3500	G35.025+0.350	G35.02+0.35	Image	22 GHz;	43;-57.6	44.1	4.1	9.4	EFF	0.33	0.110	40	+H2O +CH3OH I +CH3OH II +OH	SFR		1995 September 22-24
10	19 01 53.6	+04 12 49.2	37.8731	-0.3995	G37.872-0.397	G37.87-0.40	Image	22 GHz;		58.8	11.4	22.5	EFF	0.33	0.110	40	+H2O -CH3OH I -CH3OH II +OH	SFR		1995 September 22-24
11	19 11 54	+09 35 50.4	43.7954	-0.1272	G43.795-0.127	G43.80-0.13	Image	22 GHz;	19;-93	42.1	1022.1	1574.1	EFF	0.33	0.110	40	+H2O +CH3OH I +CH3OH II +OH	SFR		1995 September 22-24
12	19 20 31.2	+13 55 23.2	48.6056	0.0228	G48.606+0.024	G48.61+0.02	Image	22 GHz;	-12.5;-44.5	2.3	61.2	272.2	EFF	0.33	0.110	40	+H2O -CH3OH I -CH3OH II +OH	SFR_MIXED		1995 September 22-24
13	19 46 20.2	+24 35 29.4	60.8843	-0.1286	G60.884-0.129	G60.88-0.13	Image	22 GHz;	18.1;-32.9	23.3	20.6	24.4	EFF	0.33	0.110	40	+H2O +CH3OH I -CH3OH II	SFR		1995 September 22-24
14	20 10 09	+31 31 36.4	69.5402	-0.9754	G69.540-0.976	G69.54-0.98	Image	22 GHz;	-52.9;-63.1	15.1	579.8	622.7	EFF	0.33	0.110	40	+H2O +CH3OH I +CH3OH II +OH	SFR		1995 September 22-24
15	20 01 45.7	+33 32 43.1	70.2927	1.6002	G70.293+1.600	G70.29+1.60	Image	22 GHz;	-45.9;-14.5	-33.8	4.8	23.1	EFF	0.33	0.110	40	+H2O +CH3OH I -CH3OH II +OH -SiO	SFR		1995 September 22-24
16	20 39 1.2	+42 19 52.9	81.6832	0.5409	G81.711+0.563	G81.68+0.54	Image	22 GHz;	-10.7;-0.7	-8.2	4.7	9.8	EFF	0.33	0.110	40	+H2O +CH3OH I +CH3OH II +OH -SiO	SFR		1995 September 22-24
17	22 19 17.4	+63 18 41.3	106.7947	5.3115	G106.797+5.312	G106.80+5.31	Image	22 GHz;	-16.3;-3.3	-3.1	14.5	17.5	EFF	0.33	0.110	40	+H2O +CH3OH I +CH3OH II +OH	SFR		1995 September 22-24
18	22 56 12.4	+62 00 48.2	109.8538	2.1036	G109.854+2.104	G109.85+2.10	Image	22 GHz;	-19.2;-20.4	-9	107.4	162.5	EFF	0.33	0.110	40	+H2O	SFR		1995 September 22-24

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	Telescope	Vstep	RMS	Beam	Detection	Class	Date
	(J2000)	(J2000)	(deg.)	(deg.)			H2O		(km/s)	(Jy)	(arcsec)	Yes/No
1	18 10 18.4	-20 45 43.5	9.8757	-0.7500	G9.873-0.745	G9.88-0.75	22 GHz;	EFF	0.33	0.170	40	+H2O +CH3OH I -CH3OH II	SFR	1995 September 22-24
2	18 25 1.1	-13 15 39.9	18.1461	-0.2840	G18.146-0.289	G18.15-0.28	22 GHz;	EFF	0.33	0.110	40	+H2O -CH3OH I -CH3OH II +OH	SFR	1995 September 22-24
3	18 26 4.4	-11 52 32.3	19.4914	0.1352	G19.485+0.151	G19.49+0.14	22 GHz;	EFF	0.33	0.110	40	+H2O +CH3OH I +CH3OH II +OH	SFR	1995 September 22-24
4	18 44 15	-04 17 55.3	28.2877	-0.3639	G28.295-0.377	G28.29-0.36	22 GHz;	EFF	0.33	0.090	40	+H2O +CH3OH I +CH3OH II +OH	SFR	1995 September 22-24
5	18 56 01	+02 22 53.2	35.5732	0.0677	G35.575+0.067	G35.57+0.07	22 GHz;	EFF	0.33	0.070	40	+H2O +CH3OH I +CH3OH II	SFR	1995 September 22-24
6	19 30 19	+18 20 3.3	53.6046	0.0464	G53.618+0.035	G53.61+0.05	22 GHz;	EFF	0.33	0.080	40	-H2O -CH3OH I +CH3OH II +OH	SFR	1995 September 22-24
7	20 23 45.8	+37 38 32.9	76.1751	0.1264	G76.175+0.126	G76.18+0.13	22 GHz;	EFF	0.33	0.090	40	-H2O		1995 September 22-24
8	20 29 36.6	+39 01 23.5	77.9649	-0.0055	G77.963-0.006	G77.97-0.01	22 GHz;	EFF	0.33	0.060	40	+H2O -CH3OH I -CH3OH II	SFR_MIXED	1995 September 22-24
9	20 19 39.3	+40 56 37.4	78.4376	2.6592	G78.436+2.658	G78.44+2.66	22 GHz;	EFF	0.33	0.080	40	+H2O -CH3OH I -CH3OH II -OH	SFR_MIXED	1995 September 22-24
10	20 32 29.5	+40 16 4.5	79.2971	0.2814	G79.296+0.283	G79.30+0.28	22 GHz;	EFF	0.33	0.080	40	-H2O -CH3OH I -CH3OH II	SFR_MIXED	1995 September 22-24
11	20 28 10.2	+40 53 37.6	79.3202	1.3130	G79.309+1.296	G79.32+1.31	22 GHz;	EFF	0.33	0.070	40	-H2O +CH3OH I -CH3OH II -OH	SFR	1995 September 22-24
12	20 36 52.2	+41 36 24.6	80.8647	0.4199	G80.867+0.420	G80.87+0.42	22 GHz;	EFF	0.33	0.080	40	+H2O -CH3OH I +CH3OH II +OH	SFR	1995 September 22-24
13	22 57 1.4	+62 38 28.2	110.2084	2.6304	G110.210+2.616	G110.21+2.63	22 GHz;	EFF	0.33	0.070	40	-H2O -CH3OH I +CH3OH II	SFR_MIXED	1995 September 22-24
14	23 16 3.9	+60 02 0.7	111.2822	-0.6633	G111.284-0.664	G111.28-0.66	22 GHz;	EFF	0.33	0.090	40	+H2O +CH3OH I -CH3OH II -OH	SFR_MIXED	1995 September 22-24
15	23 15 31.3	+61 07 13.3	111.6121	0.3744	G111.612+0.373	G111.61+0.37	22 GHz;	EFF	0.33	0.080	40	+H2O +CH3OH I -CH3OH II	SFR	1995 September 22-24

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