2000A&A...362.1093M

Query : 2000A&A...362.1093M

2000A&A...362.1093M - Astronomy and Astrophysics, volume 362, 1093-1108 (2000/10-3)

VLBI observations of 6.7 and 12.2GHz methanol masers toward high mass star-forming regions. I. Observational results: protostellar disks or outflows?

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

Abstract (from CDS):

We present VLBI observations of 6.7 and 12.2GHz methanol masers in 14 star-forming regions, namely NGC 7538, S 252, W 75N, W 48, G 31.28+0.06, S 231, 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. In 10 of these sources, the methanol masers show elongated morphologies in the VLBI map and exhibit linear velocity gradients. These linear structures have lengths of 50 to 1300AU. We consider whether these structures are consistent with circumstellar disks. Assuming that we see the whole diameter of a Keplerian disk then we derive sub-solar central masses with the exception of W 48. However, it is possible that we only see masers in a fraction of the disk which lies in front of a young massive star. Assuming that the Keplerian disks have diameters of 1000AU, then the derived enclosed masses vary from 1 to 75M☉. We suggest that other models such as accelerating outflows could explain the linear structures; proper motions are needed in order to discriminate between the possible models.

Abstract Copyright: ∼

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

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

Simbad objects: 57

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Number of rows : 57
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 [ARM2000] G173.481+02.445 Mas 05 39 13.0658 +35 45 51.281           ~ 7 0
2 SH 2-231 Y*O 05 39 13.2 +35 45 48           ~ 132 0
3 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 742 2
4 NAME Mon R2 Stellar Cluster Cl* 06 07 47.8 -06 22 20           ~ 5 0
5 MMB G213.705-12.597 Mas 06 07 47.85 -06 22 55.2           ~ 11 0
6 SH 2-252 A HII 06 08 33 +20 39.3           ~ 74 0
7 MMB G188.946+00.886 Mas 06 08 53.3441 +21 38 29.099           ~ 24 0
8 RAFGL 5180 SFR 06 08 54.1 +21 38 25           ~ 119 0
9 SH 2-252 B HII 06 08 58 +20 38.5           ~ 18 1
10 SH 2-252 C HII 06 09 22 +20 39.5           ~ 12 0
11 NGC 2175 OpC 06 09 39 +20 29.2   7.0 6.8     ~ 262 3
12 GAL 192.58-00.04 HII 06 12 53.16 +18 00 23.3           ~ 25 0
13 MMB G192.600-00.048 Y*O 06 12 54.0100 +17 59 23.200           ~ 401 0
14 NAME SH 2-255 IRS 2 Y*O 06 12 54.88 +17 59 21.8           ~ 14 0
15 NAME SH 2-255 IRS 3 Y*O 06 12 55.03 +17 59 29.9           ~ 22 0
16 IC 2162 HII 06 13 04.1 +17 58 44           ~ 360 2
17 IRAS 06117+1350 HII 06 14 37 +13 49.6           ~ 55 0
18 MMB G196.454-01.677 Mas 06 14 37.03 +13 49 36.6           ~ 17 0
19 LBN 196.49-01.60 HII 06 14 38.3 +13 49 41           ~ 166 1
20 HD 101584 pA* 11 40 58.8051522552 -55 34 25.814696232 7.80 7.40 7.01     B8/9I/IIe 142 0
21 [GRM93] G09.61+0.20 A Rad 18 06 11.9 -20 31 41           ~ 14 0
22 GAL 009.62+00.19 HII 18 06 13.9 -20 31 44           ~ 209 0
23 [GRM93] G09.61+0.20 B Rad 18 06 14.1 -20 31 43           ~ 18 0
24 [GRM93] G09.61+0.20 C HII 18 06 14.4 -20 31 25           ~ 18 0
25 OH 009.621+00.196 Mas 18 06 14.6600 -20 31 31.700           ~ 51 0
26 [GRM93] G09.61+0.20 E HII 18 06 14.7 -20 31 32           ~ 46 0
27 [GRM93] G09.61+0.20 G Rad 18 06 14.805 -20 31 37.17           ~ 10 0
28 [GRM93] G09.61+0.20 F Rad 18 06 14.89 -20 31 38.9           ~ 29 1
29 [GRM93] G09.61+0.20 H Rad 18 06 15.047 -20 31 36.72           ~ 8 0
30 SRBY 162 Mas 18 46 03.6 -02 39 26           ~ 31 1
31 [M91] B184327.1-024236 Mas 18 46 03.6 -02 39 24           ~ 14 1
32 [MBC2000b] J184603.741-023921.43 Mas 18 46 03.741 -02 39 21.43           ~ 4 0
33 CORNISH G029.9559-00.0168 Y*O 18 46 04.18 -02 39 21.3           ~ 365 0
34 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 531 0
35 [KJB2003] G31.279+0.063 HII 18 48 11.94 -01 26 30.8           ~ 15 1
36 Caswell CH3OH 031.28+00.06 Mas 18 48 12.7 -01 26 36           ~ 9 1
37 Caswell OH 035.20-01.74 Mas 19 01 45.2 +01 13 34           ~ 28 0
38 Caswell CH3OH 035.20-01.74 Mas 19 01 45.5 +01 13 28           ~ 21 0
39 GAL 035.19-01.75 HII 19 01 47.4 +01 13 00           ~ 24 0
40 SNR G049.1-00.1 SNR 19 23 19.300 +14 09 21.00           ~ 283 0
41 W 51a HII 19 23 29.3 +14 31 38           ~ 173 0
42 W 51b SFR 19 23 32.8 +14 29 56           ~ 84 0
43 [BE83] Maser 049.49-00.37 Mas 19 23 39.429 +14 31 04.65           ~ 13 0
44 NAME W 51 North Rad 19 23 40.0 +14 30 51           ~ 159 0
45 W 51e1 HII 19 23 43.785 +14 30 26.11           ~ 135 0
46 W 51e2 Ma* 19 23 43.906 +14 30 34.48           ~ 211 0
47 Caswell OH 049.49-00.39 Mas 19 23 44.0 +14 30 30           ~ 10 0
48 W 51 SNR 19 23 50 +14 06.0           ~ 1278 1
49 MSX6C G059.7831+00.0648 Y*O 19 43 11.2464 +23 44 03.270           ~ 150 0
50 IRAS 19410+2336 SFR 19 43 11.5 +23 44 06           ~ 156 0
51 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 401 1
52 NAME Cep A HW 2 Y*O 22 56 17.9 +62 01 49           B0.5 227 0
53 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 741 2
54 [MBC2000b] J225618.095+620149.45 Mas 22 56 18.0559 +62 01 49.562           ~ 5 0
55 NGC 7538 OpC 23 13 37 +61 30.0           ~ 881 1
56 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 414 3
57 [HMW2016] G111.542+00.776 Mas 23 13 45.3600 +61 28 10.550           ~ 9 0

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