1996A&AS..120..283H

Query : 1996A&AS..120..283H

1996A&AS..120..283H - Astron. Astrophys., Suppl. Ser., 120, 283-299 (1996/December-1)

A survey of water maser emission toward ultracompact HII regions.

HOFNER P. and CHURCHWELL E.

Abstract (from CDS):

In this paper we present high resolution images and spectra toward 21 H2O maser sources in the vicinity of ultracompact (UC) HII regions. This survey provides the basis for future studies with milli-arcsecond resolution, utilizing very long baseline interferometry (VLBI) techniques. Emission from the 616-523 masing transition of interstellar H2O is observed in the close vicinity of UC HII regions with a median angular distance of 2.9" and a median linear projected distance of 0.1pc from the continuum peak. We find that for UC HII regions with cometary morphology the water maser emission is located in front of the cometary arc whereas for non-cometary UC HII regions the water masers are often observed projected onto the contours of the ionized gas. Due to the large median distance of the water masers from the I-front of the UC HII region, it is unlikely, that the water masers are formed in the shocked layer of warm molecular gas in the interface between the ionized gas of the UC HII region and surrounding molecular gas which is predicted by the Bow Shock theory of UC HII regions. A comparison with maps in the NH3 inversion transitions shows that in at least 7 cases, the water masers are associated with hot (T>100K), dense (n(H2)≃107cm–3) molecular clumps. For the UC HII regions G5.89-0.38 and G45.07+0.13 we find spatial and velocity correspondence between water masers and outflowing molecular gas. It is thus likely, that for these sources the H2O masers are taking part in the bipolar outflow.

Abstract Copyright: ∼

Journal keyword(s): masers - ISM: HII regions - radio lines: ISM

VizieR on-line data: <Available at CDS (J/A+AS/120/283): table3 table3.tex>

Nomenclature: Table 2: [HC96] GLL.ll+B.bb N=21. Table 3: [HC96] GLL.ll+B.bb NN N=109

CDS comments: Table 2: 43.89-0.38 misprint for 43.89-0.78?

Simbad objects: 132

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Number of rows : 132
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 [HC96] G05.89-0.38 5 Mas 18 00 30.103 -24 04 05.18           ~ 1 0
2 [HC96] G05.89-0.38 3 Mas 18 00 30.329 -24 04 07.05           ~ 1 0
3 [HC96] G05.89-0.38 1 Mas 18 00 30.332 -24 03 52.78           ~ 1 0
4 [HC96] G05.89-0.38 6 Mas 18 00 30.371 -24 04 04.48           ~ 1 0
5 OH 005.90-00.38 Mas 18 00 30.373 -24 04 00.96           ~ 46 1
6 [HC96] G05.89-0.38 2 Mas 18 00 30.444 -24 04 00.57           ~ 1 0
7 [HC96] G05.89-0.38 9 Mas 18 00 30.462 -24 04 03.71           ~ 1 0
8 [HC96] G05.89-0.38 7 Mas 18 00 30.585 -24 04 00.14           ~ 1 0
9 [HC96] G05.89-0.38 8 Mas 18 00 30.622 -24 04 00.52           ~ 1 0
10 RAFGL 2046 HII 18 00 32.1 -24 04 03           ~ 362 0
11 GAL 009.62+00.19 HII 18 06 13.9 -20 31 44           ~ 209 0
12 OH 009.621+00.196 Mas 18 06 14.6600 -20 31 31.700           ~ 51 0
13 [HC96] G09.62+0.19 5 Mas 18 06 14.778 -20 31 34.69           ~ 2 0
14 [HC96] G09.62+0.19 2 Mas 18 06 14.812 -20 31 37.41           ~ 2 0
15 [HC96] G09.62+0.19 4 Mas 18 06 14.858 -20 31 40.57           ~ 2 0
16 [HC96] G09.62+0.19 1 Mas 18 06 14.866 -20 31 41.19           ~ 2 0
17 [HC96] G09.62+0.19 6 Mas 18 06 14.871 -20 31 37.55           ~ 2 0
18 [HC96] G09.62+0.19 7 Mas 18 06 14.883 -20 31 38.36           ~ 3 0
19 [HC96] G09.62+0.19 3 Mas 18 06 14.932 -20 31 41.53           ~ 2 0
20 [HC96] G09.62+0.19 9 Mas 18 06 14.977 -20 31 42.51           ~ 2 0
21 [HC96] G08.67-0.36 5 Mas 18 06 18.859 -21 37 19.89           ~ 1 0
22 [HC96] G08.67-0.36 3 Mas 18 06 18.958 -21 37 39.45           ~ 1 0
23 MMB G008.669-00.356 Mas 18 06 18.99 -21 37 32.2           ~ 40 0
24 RAFGL 5436 HII 18 06 19.027 -21 37 32.32           ~ 98 0
25 [HC96] G10.47+0.03 1 Mas 18 08 38.239 -19 51 50.01           ~ 3 0
26 [HC96] G10.47+0.03 3 Mas 18 08 38.247 -19 51 50.63           ~ 1 0
27 OH 010.4+00.0 Mas 18 08 38.257 -19 51 49.04           ~ 33 0
28 GAL 010.47+00.03 HII 18 08 38.4 -19 51 52           ~ 148 0
29 GAL 010.61-00.38 HII 18 10 25.77 -19 56 04.5           ~ 5 0
30 [HC96] G10.62-0.38 5 Mas 18 10 28.326 -19 55 48.35           ~ 1 0
31 [HC96] G10.62-0.38 3 Mas 18 10 28.547 -19 55 48.49           ~ 1 0
32 [HC96] G10.62-0.38 2 Mas 18 10 28.569 -19 55 48.69           ~ 1 0
33 [HC96] G10.62-0.38 1 Mas 18 10 28.600 -19 55 48.97           ~ 2 0
34 [HC96] G10.62-0.38 4 Mas 18 10 28.607 -19 55 49.19           ~ 1 0
35 [HC96] G10.62-0.38 9 Mas 18 10 28.698 -19 55 50.10           ~ 1 0
36 [HC96] G10.62-0.38 7 Mas 18 10 28.713 -19 55 49.43           ~ 1 0
37 W 31c HII 18 10 29.1 -19 56 05           ~ 341 0
38 [HC96] G10.62-0.38 8 Mas 18 10 29.142 -19 55 46.51           ~ 1 0
39 [HC96] G10.62-0.38 6 Mas 18 10 29.190 -19 55 40.93           ~ 1 0
40 GAL 012.2-00.1 HII 18 12.6 -18 24           ~ 6 0
41 [HC96] G12.21-0.10 2 Mas 18 12 39.762 -18 24 17.74           ~ 2 0
42 [HC96] G12.21-0.10 5 Mas 18 12 39.793 -18 24 16.84           ~ 1 0
43 [HC96] G12.21-0.10 4 Mas 18 12 39.823 -18 24 18.78           ~ 1 0
44 [HC96] G12.21-0.10 7 Mas 18 12 39.863 -18 24 16.55           ~ 1 0
45 MMB G012.209-00.102 Mas 18 12 39.896 -18 24 17.71           ~ 7 0
46 [HC96] G12.21-0.10 8 Mas 18 12 40.135 -18 24 16.51           ~ 1 0
47 [HC96] G12.21-0.10 3 Mas 18 12 44.457 -18 24 24.93           ~ 1 0
48 [HC96] G12.21-0.10 6 Mas 18 12 44.460 -18 24 24.42           ~ 1 0
49 [HC96] G11.94-0.62 1 Mas 18 13 58.1205 -18 54 20.278           ~ 7 0
50 [HC96] G11.94-0.62 3 Mas 18 14 00.324 -18 53 23.61           ~ 3 0
51 [HC96] G11.94-0.62 2 Mas 18 14 00.880 -18 53 26.15           ~ 2 0
52 CORNISH G011.9368-00.6158 HII 18 14 01.0 -18 53 23           ~ 82 1
53 GAL 013.875+00.28 HII 18 14 35.2 -16 45 21           ~ 92 0
54 [HC96] G13.87+0.28 1 Mas 18 14 35.8356 -16 45 35.869           ~ 3 0
55 [HC96] G19.61-0.23 5 Mas 18 27 37.447 -11 56 38.26           ~ 2 0
56 [HC96] G19.61-0.23 4 Mas 18 27 37.644 -11 56 41.20           ~ 2 0
57 [HC96] G19.61-0.23 6 Mas 18 27 37.891 -11 56 37.06           ~ 3 0
58 AGAL G019.609-00.234 cor 18 27 38 -11 56.6           ~ 27 0
59 GAL 019.61-00.23 HII 18 27 38.0 -11 56 42           ~ 156 0
60 [HC96] G19.61-0.23 2 Mas 18 27 38.011 -11 56 36.50           ~ 2 0
61 [HC96] G19.61-0.23 3 Mas 18 27 38.202 -11 56 37.66           ~ 2 0
62 [HC96] G20.08-0.14 6 Mas 18 28 10.229 -11 28 48.19           ~ 1 0
63 [HC96] G20.08-0.14 1 Mas 18 28 10.258 -11 28 47.84           ~ 1 0
64 [HC96] G20.08-0.14 2 Mas 18 28 10.287 -11 28 47.70           ~ 1 0
65 [HC96] G20.08-0.14 3 Mas 18 28 10.289 -11 28 49.09           ~ 1 0
66 [HC96] G20.08-0.14 4 Mas 18 28 10.299 -11 28 47.22           ~ 1 0
67 [HC96] G20.08-0.14 5 Mas 18 28 10.338 -11 28 47.41           ~ 1 0
68 OH 020.1-00.1 SFR 18 28 10.37 -11 28 49.8           ~ 111 0
69 RAFGL 5491 mul 18 28 10.7 -11 29 01           ~ 45 0
70 [HC96] G29.96-0.02 3 Mas 18 46 03.607 -02 39 25.15           ~ 2 0
71 [HC96] G29.96-0.02 2 Mas 18 46 03.737 -02 39 22.14           ~ 2 0
72 [HC96] G29.96-0.02 1 Mas 18 46 03.785 -02 39 22.08           ~ 2 0
73 CORNISH G029.9559-00.0168 Y*O 18 46 04.18 -02 39 21.3           ~ 365 0
74 IRAS 18449-0115 cor 18 47 34.27 -01 12 43.2           ~ 388 0
75 [HC96] G31.41+0.31 3 Mas 18 47 34.274 -01 12 46.28           ~ 1 0
76 [HC96] G31.41+0.31 6 Mas 18 47 34.307 -01 12 46.46           ~ 1 0
77 [HC96] G31.41+0.31 1 Mas 18 47 34.307 -01 12 45.56           ~ 1 0
78 [HC96] G31.41+0.31 4 Mas 18 47 34.316 -01 12 46.12           ~ 1 0
79 [HC96] G31.41+0.31 5 Mas 18 47 34.360 -01 12 46.36           ~ 1 0
80 [HC96] G31.41+0.31 2 Mas 18 47 34.366 -01 12 45.28           ~ 1 0
81 [HC96] G31.41+0.31 7 Mas 18 47 34.404 -01 12 44.74           ~ 1 0
82 [HC96] G31.41+0.31 8 Mas 18 47 34.443 -01 12 48.45           ~ 1 0
83 GAL 032.80+00.19 HII 18 50 30 -00 02.0           ~ 36 0
84 [HC96] G32.80+0.19 6 Mas 18 50 30.723 -00 01 57.92           ~ 1 0
85 [HC96] G32.80+0.19 1 Mas 18 50 30.726 -00 01 59.22           ~ 1 0
86 [HC96] G32.80+0.19 3 Mas 18 50 30.726 -00 01 58.70           ~ 1 0
87 [HC96] G32.80+0.19 4 Mas 18 50 30.762 -00 02 00.19           ~ 1 0
88 [HC96] G32.80+0.19 5 Mas 18 50 30.784 -00 01 50.58           ~ 1 0
89 [HC96] G32.80+0.19 2 Mas 18 50 30.978 -00 01 38.99           ~ 1 0
90 [HC96] G34.26+0.15 11 Mas 18 53 17.689 +01 14 55.92           ~ 2 0
91 [HC96] G34.26+0.15 8 Mas 18 53 18.519 +01 14 57.50           ~ 2 0
92 RAFGL 2271 SFR 18 53 18.54 +01 14 57.9           ~ 505 0
93 [HC96] G34.26+0.15 9 Mas 18 53 18.605 +01 14 58.24           ~ 2 0
94 [HC96] G34.26+0.15 5 Mas 18 53 18.605 +01 14 59.08           ~ 2 0
95 [HC96] G34.26+0.15 1 Mas 18 53 18.652 +01 14 57.66           ~ 2 0
96 [HC96] G34.26+0.15 7 Mas 18 53 18.657 +01 14 55.13           ~ 2 0
97 [HC96] G34.26+0.15 3 Mas 18 53 18.674 +01 14 59.51           ~ 2 0
98 [HC96] G34.26+0.15 2 Mas 18 53 18.682 +01 14 58.14           ~ 3 0
99 [HC96] G34.26+0.15 6 Mas 18 53 18.704 +01 14 54.68           ~ 2 0
100 [HC96] G34.26+0.15 4 Mas 18 53 18.706 +01 14 55.97           ~ 2 0
101 [HC96] G34.26+0.15 10 Mas 18 53 18.780 +01 14 57.84           ~ 2 0
102 [HC96] G37.55-0.11 1 Mas 19 00 15.963 +04 03 16.50           ~ 3 0
103 GAL 037.55-00.11 HII 19 00 16.02 +04 03 15.1           ~ 40 0
104 [HC96] G35.20-1.74 2 Mas 19 01 43.163 +01 13 36.60           ~ 4 0
105 OH 035.200-01.736 Mas 19 01 45.5420 +01 13 32.690           ~ 16 0
106 GAL 035.2-01.7 HII 19 01 46.50 +01 13 24.6           ~ 18 0
107 [HC96] G43.18-0.52 2 Mas 19 12 09.029 +08 52 14.10           ~ 1 0
108 [HC96] G43.18-0.52 1 Mas 19 12 09.221 +08 52 15.20           ~ 1 0
109 [HC96] G43.18-0.52 HII 19 12 09.5 +08 52 18           ~ 5 0
110 GAL 043.18-00.52 HII 19 12 23.19 +08 32 12.2           ~ 39 0
111 [HC96] G45.07+0.13 1 Mas 19 13 22.019 +10 50 53.83           ~ 3 0
112 [HC96] G45.07+0.13 3 Mas 19 13 22.037 +10 50 53.46           ~ 1 0
113 IRAS 19110+1045 Y*O 19 13 22.0427 +10 50 53.336           ~ 126 0
114 [HC96] G45.07+0.13 2 Mas 19 13 22.066 +10 50 55.55           ~ 2 0
115 [HC96] G45.07+0.13 4 Mas 19 13 22.101 +10 50 53.10           ~ 1 0
116 GAL 043.89-00.78 HII 19 14 26.16 +09 22 34.0           ~ 51 0
117 [HC96] G43.89-0.78 1 Mas 19 14 26.348 +09 22 36.21           ~ 1 0
118 [HC96] G43.89-0.78 2 Mas 19 14 26.389 +09 22 36.72           ~ 2 0
119 [HC96] G50.32+0.68 6 Mas 19 21 27.388 +15 44 17.57           ~ 1 0
120 [HC96] G50.32+0.68 4 Mas 19 21 27.424 +15 44 18.25           ~ 1 0
121 [HC96] G50.32+0.68 2 Mas 19 21 27.426 +15 44 17.66           ~ 1 0
122 [HC96] G50.32+0.68 3 Mas 19 21 27.471 +15 44 18.85           ~ 1 0
123 [HC96] G50.32+0.68 5 Mas 19 21 27.487 +15 44 20.65           ~ 1 0
124 [HC96] G50.32+0.68 1 Mas 19 21 27.506 +15 44 20.34           ~ 1 0
125 GAL 050.32+00.68 HII 19 21 27.55 +15 44 21.3           ~ 8 0
126 [KC97c] G075.8+00.3 HII 20 21 41.0 +37 25 56           ~ 8 0
127 GAL 075.76+00.34 Mas 20 21 41.0860 +37 25 29.280           ~ 23 1
128 [HC96] G75.78-0.34 5 Mas 20 21 41.337 +37 25 38.28           ~ 3 1
129 [HC96] G75.78-0.34 1 Mas 20 21 43.976 +37 26 37.98           ~ 10 1
130 [HC96] G75.78-0.34 2 Mas 20 21 43.985 +37 26 37.66           ~ 2 1
131 GAL 075.78+00.34 cor 20 21 44.00 +37 26 38.0           ~ 126 1
132 [HC96] G75.78-0.34 4 Mas 20 21 44.015 +37 26 37.63           ~ 4 1

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