CDS

1999ApJ...514..232K

Query : 1999ApJ...514..232K

1999ApJ...514..232K - Astrophys. J., 514, 232-248 (1999/March-3)

Ultracompact H II regions with extended radio-continuum emission.

KURTZ S.E., WATSON A.M., HOFNER P. and OTTE B.

Abstract (from CDS):

We have conducted a 3.6 cm radio-continuum survey with the VLA in its compact D-array to look for extended radio-continuum emission around known ultracompact H II regions. We find extended emission in 12 out of 15 fields. The extended emission ranges in size up to 5', with typical diameters of 60", or 2 pc. In some cases, the extended component produces an order of magnitude more flux than the ultracompact component. It is possible that the extended emission is from H II regions not connected with the ultracompact H II regions, but on the basis of the morphology of the emission, we believe that it is possible or even likely that the ultracompact and extended emission are directly connected in about half of the sources. The possible consequences of directly connected extended emission are profound. We may be forced to reconsider the definition of an ultracompact H II region and consider models in which dense, ultracompact ionized components are embedded in less dense, more extended regions.

Abstract Copyright: ∼

Journal keyword(s): ISM: H II Regions - Radio Continuum: ISM

Simbad objects: 51

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Number of rows : 51
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023 		#notes
1 [KCW94] 106.800+05.316 Rad 17 41 26.3 +63 02 38           ~ 4 0
2 [GRM93] G09.61+0.20 A Rad 18 06 11.9 -20 31 41           ~ 14 0
3 GAL 009.62+00.19 HII 18 06 13.9 -20 31 44           ~ 199 0
4 [GRM93] G09.61+0.20 B Rad 18 06 14.1 -20 31 43           ~ 18 0
5 [GRM93] G09.61+0.20 C HII 18 06 14.4 -20 31 25           ~ 18 0
6 [GRM93] G09.61+0.20 D HII 18 06 14.9 -20 31 43           ~ 19 0
7 GAL 031.40-00.26 HII 18 49 32.1 -01 29 04           ~ 44 0
8 AGAL G031.396-00.257 cor 18 49 33 -01 29.0           ~ 32 0
9 [KCW94] 031.397-00.257 Rad 18 49 33.090 -01 28 57.68           ~ 3 0
10 [KCW94] 032.796+00.191 Rad 18 50 30.646 -00 02 01.02           ~ 2 0
11 [KCW94] 032.797+00.191 Rad 18 50 30.709 -00 01 58.13           ~ 3 0
12 RAFGL 5536 HII 18 50 30.8 -00 01 59           ~ 41 0
13 [KCW94] 032.798+00.190 Rad 18 50 30.997 -00 01 57.15           ~ 3 0
14 IRAS 18496+0004 HII 18 52 07.7 +00 08 11           ~ 24 1
15 [KCW94] 033.133-00.092 Rad 18 52 07.958 +00 08 11.60           ~ 4 0
16 MSX6C G035.5789-00.0304 Y*O 18 56 22.56 +02 20 27.8           ~ 19 0
17 AGAL G035.579-00.031 cor 18 56 22.6865 +02 20 19.057           ~ 31 0
18 IRAS 18538+0216 HII 18 56 23.5 +02 20 38           ~ 33 0
19 CORNISH G037.8731-00.3996 HII 19 01 53.58 +04 12 51.7           ~ 40 1
20 [KCW94] 043.237-00.045 Rad 19 10 33.524 +09 08 25.11           ~ 5 0
21 [KCW94] 043.237-00.046 Rad 19 10 33.638 +09 08 24.40           ~ 4 0
22 IRAS 19081+0903 HII 19 10 34.0 +09 08 01           ~ 24 0
23 [KCW94] 048.609+00.027 Rad 19 20 30.782 +13 55 43.72           ~ 4 0
24 [KCW94] 048.606+00.024 Rad 19 20 31.1 +13 55 23           ~ 6 0
25 IRAS 19181+1349 HII 19 20 31.3 +13 55 24           ~ 52 0
26 [WBN74] W 51 IRS 2 PCG 19 23 39.93 +14 31 09.4           ~ 280 0
27 NAME SH 2-87 IRS 1 HII 19 46 20.130 +24 35 29.43           ~ 15 0
28 SH 2-87 bub 19 46 20.7 +24 35 15           ~ 154 2
29 GAL 078.44+02.66 HII 20 19 39.216 +40 56 36.63           ~ 14 0
30 IRAS 20178+4046 HII 20 19 39.3 +40 56 30           ~ 47 1
31 WSRTGP 2025+3712 HII 20 27 26.4 +37 22 48           ~ 48 0
32 NAME SH 2-106 IR Y*O 20 27 26.502 +37 22 42.03           ~ 159 1
33 [KCW94] 076.383-00.621 HII 20 27 26.767 +37 22 47.96           ~ 9 0
34 SH 2-106 HII 20 27 26.8 +37 22 49           ~ 432 2
35 18P 42 Rad 20 28 10.1 +40 52 00           ~ 36 0
36 GAL 077.96-00.01 HII 20 29 38.1 +39 02 04           ~ 39 1
37 SH 2-140 OpC 22 19 07.8 +63 17 07           ~ 653 2
38 [KCW94] 106.795+05.311 Rad 22 19 17.488 +63 18 41.17           ~ 5 0
39 IRAS 22176+6303 Y*O 22 19 17.978 +63 18 52.92           ~ 592 0
40 NAME SH 2-140 IRS 1 Y*O 22 19 18.277 +63 18 45.82           ~ 195 0
41 NAME Cepheus A East SFR 22 54.3 +61 46           ~ 66 0
42 [KCW94] 109.854+02.104 Rad 22 56 12.3843746808 +62 00 48.339477396           ~ 5 0
43 [KCW94] 109.871+02.114 Rad 22 56 17.982 +62 01 49.70           ~ 2 0
44 [KCW94] 109.871+02.113 Rad 22 56 18.185 +62 01 46.35           ~ 4 0
45 IRAS 22543+6145 HII 22 56 19.1 +62 01 57           ~ 71 0
46 [KCW94] 109.874+02.110 Rad 22 56 20.170 +62 01 40.15           ~ 3 0
47 [KCW94] 109.876+02.109 Rad 22 56 21.364 +62 01 37.53           ~ 3 0
48 SH 2-159 Y*O 23 15 31.2384366062 +61 07 10.181362705           ~ 179 2
49 SH 2-157 B HII 23 16 04 +60 02.1           ~ 11 0
50 IRAS 23138+5945 mul 23 16 04.8 +60 02 00           ~ 42 0
51 LBN 111.14-00.72 HII 23 16 07 +60 02.5           ~ 95 1

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2023.05.29-16:40:04

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