2001A&A...369..278M

Query : 2001A&A...369..278M

2001A&A...369..278M - Astronomy and Astrophysics, volume 369278-290 (2001/4-1)

VLBI observations of 6.7 and 12.2 GHz methanol masers toward high mass star-forming regions. II. Tracing massive protostars.

MINIER V., CONWAY J.E. and BOOTH R.S.

Abstract (from CDS):

We compare the absolute positions of methanol maser sites with those of typical tracers of young massive stellar objects, such as ultra-compact HII regions, outflows and hot molecular cores. We have selected thirteen star-forming regions for which we have produced VLBI maps of 6.7 and 12.2GHz methanol masers, and for which complementary high resolution images are available in the literature. These sources are namely: IRAS 20126+4104, NGC 7538, S 252, G 31.28+0.06, W 75N, S 255, S 269, Mon R2, G 9.62+0.20, Cep A, W 51, G 59.78+0.06 and G 29.95-0.02. Eight of the methanol maser sources coincide in position within 2000 AU with outflows and/or hot molecular cores, i.e. phenomena occuring at the earliest stage of massive star formation. Only two sources coincide in position with hyper-compact HII regions. We conclude that 6.7 and 12.2GHz methanol masers are likely to be one of the first signposts of massive star formation and perhaps the first signpost of a massive protostar.

Abstract Copyright: ∼

Journal keyword(s): HII regions - masers - stars: formation - circumstellar matter - techniques: interferometric

Nomenclature: Table 1: [MBC2000b] JHHMMSS.sss+DDMMSS.ss N=7 added.

Simbad objects: 29

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Number of rows : 29
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 [MBC2000b] J060747.867-062256.89 Mas 06 07 46.867 -06 22 56.89           ~ 1 0
2 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 789 2
3 MMB G188.946+00.886 Mas 06 08 53.3441 +21 38 29.099           ~ 31 0
4 RAFGL 5180 SFR 06 08 54.1 +21 38 25           ~ 125 0
5 NGC 2175 OpC 06 09 39 +20 29.2   7.0 6.8     ~ 270 3
6 MMB G192.600-00.048 Y*O 06 12 54.0100 +17 59 23.200           ~ 430 0
7 IC 2162 HII 06 13 04.1 +17 58 44           ~ 372 2
8 MMB G196.454-01.677 Mas 06 14 37.03 +13 49 36.6           ~ 17 0
9 LBN 196.49-01.60 HII 06 14 38.29 +13 49 41.0           ~ 169 1
10 OH 009.621+00.196 Mas 18 06 14.6600 -20 31 31.700           ~ 56 0
11 [MBC2000b] J184603.741-023921.43 Mas 18 46 03.741 -02 39 21.43           ~ 4 0
12 [MBC2000b] J184812.385-012622.60 Mas 18 48 12.385 -01 26 22.60           ~ 3 0
13 [BE83] Maser 049.49-00.37 Mas 19 23 39.429 +14 31 04.65           ~ 13 0
14 OKYM W51 IRS 2 6 IR 19 23 39.816 +14 31 05.07           ~ 29 0
15 NAME W 51 North Rad 19 23 40.0 +14 30 51           ~ 169 0
16 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1
17 MSX6C G059.7831+00.0648 Y*O 19 43 11.2464 +23 44 03.270           ~ 159 0
18 IRAS 19410+2336 SFR 19 43 11.5 +23 44 06           ~ 160 0
19 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 469 0
20 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 423 1
21 [HRB81] W75N(Ba) HII 20 38 36.445 +42 37 34.82           ~ 55 0
22 [MBC2000b] J203836.452+423736.07 Mas 20 38 36.452 +42 37 36.07           ~ 1 0
23 [TGR97] VLA 2 HII 20 38 36.482 +42 37 34.08           ~ 63 0
24 [HRB81] W75N(Bb) HII 20 38 36.486 +42 37 33.44           ~ 38 0
25 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 760 2
26 [MBC2000b] J225618.095+620149.45 Mas 22 56 18.0559 +62 01 49.562           ~ 10 0
27 NGC 7538 OpC 23 13 37 +61 30.0           ~ 920 1
28 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 433 3
29 [HMW2016] G111.542+00.776 Mas 23 13 45.3600 +61 28 10.550           ~ 13 0

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