2000ApJ...530..371F

Query : 2000ApJ...530..371F

2000ApJ...530..371F - Astrophys. J., 530, 371-386 (2000/February-2)

Radio continuum emission at OH and H2O maser sites.

FORSTER J.R. and CASWELL J.L.

Abstract (from CDS):

A search for centimeter radio continuum emission associated with OH and H2O masers has been made toward 26 fields containing 45 separate maser sites using the Australia Telescope Compact Array (ATCA) at 8.2 and 9.2 GHz. The sensitivity achieved for fields not limited by dynamic range is ∼0.15 mJy rms. This is the deepest radio search for embedded stellar sources at sites containing OH and H2O masers made to date. Only 17 compact continuum sources were detected within 2" of the 45 maser sites searched. The absence of 3 cm continuum emission at the mJy level in 62% of the maser sites shows that most OH/H2O maser sites do not contain well-developed ultracompact H II regions (UCHIIs). The implications of this result on the nature of the source pumping the maser emission are discussed. While other possibilities cannot be ruled out, we argue that many maser sites without detected UCHIIs are most likely massive stars still in the pre-main-sequence contraction stage.

Abstract Copyright: ∼

Journal keyword(s): ISM: H II Regions - Masers - Stars: Pre-Main-Sequence

Nomenclature: Table 1: [FC2000] GLLL.ll+B.bb A N=29.

Simbad objects: 46

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Number of rows : 46
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
2 [WHR97] 17234-3405 HII 17 26 51.8 -34 08 27           ~ 2 0
3 GPSR5 352.517-0.155 HII 17 27 11.3 -35 19 32           ~ 4 1
4 [FC2000] G352.52-0.15 A HII 17 27 11.33 -35 19 32.1           ~ 1 0
5 GAL 354.61+00.47 HII 17 30 16.8 -33 13 53           ~ 3 0
6 [GBM2006] 17271-3439A HII 17 30 26.12 -34 41 45.2           ~ 5 0
7 IRAS 17302-3245 cor 17 33 28.8168 -32 47 58.668           ~ 23 0
8 [FC2000] G359.14+0.03 B HII 17 43 25.49 -29 39 28.6           ~ 1 0
9 GPSR5 359.134+0.030 HII 17 43 25.52 -29 39 29.1           ~ 2 0
10 OH 359.14+00.03 Mas 17 43 25.6109 -29 39 17.551           ~ 36 0
11 [FC2000] G359.14+0.03 A HII 17 43 25.64 -29 39 18.2           ~ 1 0
12 [FC2000] G359.44-0.10 A HII 17 44 40.190 -29 28 15.20           ~ 4 0
13 [FC2000] G359.43-0.11 B HII 17 44 40.55 -29 29 04.0           ~ 2 0
14 OH 359.62-00.25 Mas 17 45 39.0697 -29 23 30.265           ~ 35 0
15 RCW 137 HII 17 45 42.3 -29 22 06           ~ 15 0
16 IRAS 17432-2835 HII 17 46 27.4 -28 36 06           ~ 29 0
17 [FC2000] G359.97-0.46 A HII 17 47 19.84 -29 11 54.6           ~ 1 0
18 [FC2000] G000.55-0.85 A HII 17 50 04.55 -28 54 33.8           ~ 1 0
19 [FC2000] G000.55-0.85 B HII 17 50 14.39 -28 54 25.6           ~ 1 0
20 GPSR5 2.143+0.010 HII 17 50 36.02 -27 05 47.1           ~ 3 0
21 [FC2000] G003.91+0.00 A HII 17 54 38.78 -25 34 45.3           ~ 1 0
22 GPSR5 3.910+0.001 HII 17 54 38.80 -25 34 45.0           ~ 4 0
23 [FC2000] G003.91+0.00 B HII 17 54 39.22 -25 34 41.2           ~ 1 0
24 GPSR5 3.912+0.000 Rad 17 54 39.25 -25 34 40.9           ~ 2 0
25 GPSR5 9.622+0.198 HII 18 06 14.36 -20 31 25.9           ~ 2 0
26 [FC2000] G009.62+0.20 B HII 18 06 14.36 -20 31 25.7           ~ 1 0
27 OH 009.621+00.196 Mas 18 06 14.6600 -20 31 31.700           ~ 56 0
28 GPSR5 9.619+0.194 HII 18 06 14.88 -20 31 43.6           ~ 2 0
29 [FC2000] G009.62+0.19 A HII 18 06 14.94 -20 31 42.8           ~ 1 0
30 MMB G008.669-00.356 Mas 18 06 18.99 -21 37 32.2           ~ 41 0
31 RAFGL 5436 HII 18 06 19.027 -21 37 32.32           ~ 108 0
32 [FC2000] G011.03+0.06 B HII 18 09 39.64 -19 21 19.0           ~ 1 0
33 GPSR5 11.034+0.063 Rad 18 09 39.69 -19 21 18.8           ~ 2 0
34 [FC2000] G011.03+0.06 A HII 18 09 39.85 -19 21 21.4           ~ 1 0
35 AGAL G011.902-00.141 cor 18 12 11 -18 41.6           ~ 48 0
36 CORNISH G011.9032-00.1407 HII 18 12 11.26 -18 41 30.7           ~ 3 0
37 CORNISH G011.9039-00.1411 HII 18 12 11.4 -18 41 29           ~ 2 0
38 CORNISH G012.2081-00.1019 HII 18 12 39.69 -18 24 21.3           ~ 6 0
39 W 33a Y*O 18 14 39.56547 -17 52 02.2260           ~ 746 0
40 EGO G016.59-0.05 HII 18 21 07.9 -14 31 53           ~ 129 0
41 DRT03 G19.61-0.23 2 HII 18 27 37.340 -11 56 32.39           ~ 8 0
42 [FC2000] G019.61-0.24 A HII 18 27 38.16 -11 56 40.2           ~ 4 0
43 GPSR5 19.610-0.235 HII 18 27 38.3 -11 56 47           ~ 6 1
44 GAL 023.44-00.18 HII 18 34 43.6 -08 32 25           ~ 58 0
45 [FC2000] G024.79+0.08 A HII 18 36 12.56 -07 12 10.8           ~ 3 0
46 [FC2000] G024.79+0.08 B HII 18 36 12.69 -07 12 14.5           ~ 2 0

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