2000ApJ...530..371F


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.28CET11:41:23

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: 49

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Number of rows : 49

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 935 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           ~ 3 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 GPSR 355.345+0.149 HII 17 33 28.90 -32 47 52.8           ~ 3 0
8 [FC2000] G355.34+0.15 A HII 17 33 29.02 -32 47 58.3           ~ 1 0
9 [FC2000] G359.14+0.03 B HII 17 43 25.49 -29 39 28.6           ~ 1 0
10 GPSR5 359.134+0.030 HII 17 43 25.52 -29 39 29.1           ~ 2 0
11 [FC2000] G359.14+0.03 A HII 17 43 25.64 -29 39 18.2           ~ 1 0
12 MMB G359.138+00.031 Mas 17 43 25.67 -29 39 17.3           ~ 35 0
13 [FC2000] G359.44-0.10 A HII 17 44 40.13 -29 28 15.5           ~ 2 0
14 [FC2000] G359.43-0.11 B HII 17 44 40.55 -29 29 04.0           ~ 1 0
15 Caswell OH 359.615-00.243 Mas 17 45 41.3 -29 23 35           ~ 15 0
16 RCW 137 HII 17 45 42.3 -29 22 06           ~ 14 0
17 GAL 000.38+00.04 HII 17 46 21.5 -28 35 45           ~ 23 0
18 [FC2000] G359.97-0.46 A HII 17 47 19.84 -29 11 54.6           ~ 1 0
19 [FC2000] G000.55-0.85 A HII 17 50 04.55 -28 54 33.8           ~ 1 0
20 [FC2000] G000.55-0.85 B HII 17 50 14.39 -28 54 25.6           ~ 1 0
21 [FC2000] G002.14+0.01 A HII 17 50 36.02 -27 05 47.1           ~ 1 0
22 GPSR5 2.143+0.010 HII 17 50 36.04 -27 05 45.7           ~ 3 0
23 [FC2000] G003.91+0.00 A HII 17 54 38.78 -25 34 45.3           ~ 1 0
24 GPSR5 3.910+0.001 HII 17 54 38.80 -25 34 45.0           ~ 2 0
25 [FC2000] G003.91+0.00 B HII 17 54 39.22 -25 34 41.2           ~ 1 0
26 GPSR5 3.912+0.000 Rad 17 54 39.25 -25 34 40.9           ~ 2 0
27 GPSR5 9.622+0.198 HII 18 06 14.36 -20 31 25.9           ~ 2 0
28 [FC2000] G009.62+0.20 B HII 18 06 14.36 -20 31 25.7           ~ 1 0
29 MMB G009.621+00.196 Mas 18 06 14.67 -20 31 32.4           ~ 15 0
30 GPSR5 9.619+0.194 HII 18 06 14.88 -20 31 43.6           ~ 2 0
31 [FC2000] G009.62+0.19 A HII 18 06 14.94 -20 31 42.8           ~ 1 0
32 [CKW87] 180318.5-213754 HII 18 06 18.68 -21 37 33.7           ~ 5 0
33 GPSR5 8.669-0.356 HII 18 06 19.06 -21 37 32.4           ~ 2 0
34 [FC2000] G011.03+0.06 B HII 18 09 39.64 -19 21 19.0           ~ 1 0
35 GPSR5 11.034+0.063 Rad 18 09 39.69 -19 21 18.8           ~ 2 0
36 [FC2000] G011.03+0.06 A HII 18 09 39.85 -19 21 21.4           ~ 1 0
37 GPSR5 11.903-0.141 Rad 18 12 11.34 -18 41 30.2           ~ 4 0
38 [FC2000] G011.90-0.14 B HII 18 12 11.34 -18 41 30.2           ~ 1 0
39 [ERG2015] 2590 cor 18 12 11.3416 -18 41 22.847           ~ 14 0
40 GPSR5 12.208-0.102 HII 18 12 39.64 -18 24 22.1           ~ 2 0
41 W 33a Y*O 18 14 39.0 -17 52 03           ~ 573 0
42 MMB G012.909-00.260 Mas 18 14 39.5714 -17 52 00.380           ~ 63 0
43 OH 16.59 -0.05 cor 18 21 09.2137 -14 31 45.484           ~ 113 0
44 DRT03 G19.61-0.23 2 HII 18 27 37.340 -11 56 32.39           ~ 8 0
45 [FC2000] G019.61-0.24 A HII 18 27 38.16 -11 56 40.2           ~ 4 0
46 [WBH2005] G019.610-0.235 HII 18 27 38.18 -11 56 36.0           ~ 3 1
47 GAL 023.44-00.18 HII 18 34 43.6 -08 32 25           ~ 46 0
48 [FC2000] G024.79+0.08 A HII 18 36 12.56 -07 12 10.8           ~ 2 0
49 [FC2000] G024.79+0.08 B HII 18 36 12.69 -07 12 14.5           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2020.01.28-11:41:23

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