2009A&A...502..155B


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.29CET11:41:00

2009A&A...502..155B - Astronomy and Astrophysics, volume 502, 155-173 (2009/7-4)

The diversity of methanol maser morphologies from VLBI observations.

BARTKIEWICZ A., SZYMCZAK M., VAN LANGEVELDE H.J., RICHARDS A.M.S. and PIHLSTROEM Y.M.

Abstract (from CDS):

The 6.7GHz methanol maser marks an early stage of high-mass star formation, but the origin of this maser is currently a matter of debate. In particular it is unclear whether the maser emission arises in discs, outflows or behind shocks running into rotating molecular clouds. We investigated which structures the methanol masers trace in the environment of high-mass protostar candidates by observing a homogenous sample of methanol masers selected from Torun surveys. We also probed their origins by looking for associated HII regions and IR emission. We selected 30 methanol sources with improved position accuracies achieved using MERLIN and another 3 from the literature. We imaged 31 of these using the European VLBI Network's expanded array of telescopes with 5-cm (6-GHz) receivers. We used the VLA to search for 8.4GHz radio continuum counterparts and inspected Spitzer GLIMPSE data at 3.6-8µm from the archive. High angular resolution images allowed us to analyze the morphology and kinematics of the methanol masers in great detail and verify their association with radio continuum and mid-infrared emission. A new class of ``ring-like'' methanol masers in star-forming regions appeared to be suprisingly common, 29% of the sample. The new morphology strongly suggests that methanol masers originate in the disc or torus around a proto- or a young massive star. However, the maser kinematics indicate the strong influence of outflow or infall. This suggests that they form at the interface between the disc/torus and a flow. This is also strongly supported by Spitzer results because the majority of the masers coincide with 4.5µm emission to within less than 1". Only four masers are associated with the central parts of UC HII regions. This implies that 6.7GHz methanol maser emission occurs before HII region observable at cm wavelengths is formed.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: molecules - masers - instrumentation: high angular resolution

Simbad objects: 72

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Number of rows : 72

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           ~ 936 2
2 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3661 1
3 3C 345 QSO 16 42 58.8100340220 +39 48 36.999540578   16.81 16.59 16.84   ~ 1539 2
4 PMN J1825-0737 Rad 18 25 37.60955203 -07 37 30.0129436           ~ 17 1
5 [SHK2000] 18278-0936 Mas 18 30 35.7 -09 34 26           ~ 5 0
6 [SHK2000] 18278-1009 Mas 18 30 36.5 -10 06 44           ~ 5 0
7 IRAS 18282-1024 Y*O 18 31 03.7599 -10 22 42.557           ~ 26 3
8 [SHK2000] 18282-1024 Mas 18 31 06.3 -10 21 37           ~ 5 0
9 GAL 022.357+00.066 HII 18 31 44.9 -09 22 09           ~ 38 0
10 ICRF J183220.8-103511 G 18 32 20.83647 -10 35 11.1968           ~ 66 1
11 IRAS 18297-0931 FIR 18 32 29.5 -09 29 14           ~ 5 0
12 [SHK2000] 18305-0826 Mas 18 33 13.1 -08 23 56           ~ 5 0
13 IRAS 18305-0826 Y*O 18 33 14.32 -08 23 57.5           ~ 11 0
14 PMN J1834-0301 Rad 18 34 00.12 -03 03 40.1           ~ 6 1
15 IRAS 18321-0820 Y*O 18 34 51.56 -08 18 21.4           ~ 36 0
16 [SHK2000] 18322-0721 Mas 18 34 53.0 -07 19 11           ~ 5 0
17 [SHK2000] 18321-0854 Mas 18 34 54.5 -08 50 04           ~ 7 0
18 GAL 023.707-00.198 HII 18 35 12.5 -08 17 46           ~ 28 0
19 [SVG93] 183231.7-082049 Mas 18 35 15.1 -08 18 21           ~ 3 0
20 [BK2004] J183520.8-074848 Mas 18 35 20.8 -07 48 48           ~ 7 0
21 [SHK2000] 18326-0802 Mas 18 35 22.9 -08 01 11           ~ 5 0
22 [SKH2002] 24.93+0.08 Mas 18 36 29.2 -07 05 05           ~ 4 0
23 IRAS 18345-0641 cor 18 37 17.4520 -06 38 30.992           ~ 42 0
24 [VGM95] 183436.9-064115 Mas 18 37 18.3 -06 38 38           ~ 7 0
25 [SKH2002] 24.64-0.33 Mas 18 37 25.2 -07 31 53           ~ 4 0
26 [SHK2000] 18372-0537 Mas 18 39 51.8 -05 34 52           ~ 5 0
27 [SHK2000] 18372-0541 Mas 18 39 52.8 -05 38 48           ~ 5 0
28 [SKH2002] 27.21+0.26 Mas 18 40 03.8 -04 58 09           ~ 4 0
29 AGAL G027.221+00.137 Y*O 18 40 30.8263 -05 00 51.619           ~ 16 0
30 [SHK2000] 18392-0436 Mas 18 41 47.5 -04 33 11           ~ 5 0
31 [SKH2002] 28.85+0.50 Mas 18 42 12.8 -03 24 26           ~ 5 0
32 [SKH2002] 28.69+0.41 Mas 18 42 13.6 -03 35 07           ~ 4 0
33 [SKH2002] 28.82+0.37 Mas 18 42 35.2 -03 29 26           ~ 5 0
34 [SHK2000] 18402-0403 Mas 18 42 54.5 -04 00 04           ~ 5 0
35 [SKH2002] 28.53+0.12 Mas 18 42 57.7 -03 51 59           ~ 4 0
36 [SKH2002] 28.02-0.44 Mas 18 44 02.1 -04 34 14           ~ 5 0
37 [SKH2002] 29.31-0.15 Mas 18 45 23.1 -03 17 23           ~ 4 0
38 GPSR5 30.330+0.090 Rad 18 46 22.10 -02 16 28.0           ~ 2 0
39 [SHK2000] 18438-0222 Mas 18 46 23.7 -02 17 56           ~ 6 0
40 [SHK2000] 18441-0134 Mas 18 46 46.2 -01 31 06           ~ 4 0
41 [SKH2002] 30.40-0.29 Mas 18 47 51.2 -02 23 15           ~ 4 0
42 [SHK2000] 18454-0136 Mas 18 48 00.3 -01 34 01           ~ 4 0
43 CORNISH G031.1596+00.0448 HII 18 48 02.710 -01 33 24.83           ~ 3 1
44 [WBH2005] G031.581+0.075 HII 18 48 42.55 -01 10 04.5           ~ 3 1
45 [SHK2000] 18461-0113 Mas 18 48 44.3 -01 11 18           ~ 5 0
46 SSTGLMC G032.990+00.040 HII 18 51 24.8 +00 04 19           ~ 31 0
47 [VGM95] 184854.1+000036 Mas 18 51 27.8 +00 04 14           ~ 5 0
48 NVSS J185146+003532 Rad 18 51 46.72295 +00 35 32.3649           ~ 53 1
49 [SKH2002] 33.86+0.01 Mas 18 53 05.2 +00 49 36           ~ 3 0
50 [SHK2000] 18508+0052 Mas 18 53 24.1 +00 55 13           ~ 4 0
51 [SKH2002] 33.74-0.15 Mas 18 53 26.9 +00 39 01           ~ 3 0
52 [BK2004] J185328.7+003158 Mas 18 53 28.7 +00 31 58           ~ 14 0
53 [SKH2002] 34.10+0.01 Mas 18 53 31.9 +01 02 26           ~ 3 0
54 [SKH2002] 34.74-0.09 Mas 18 55 03.4 +01 34 17           ~ 3 0
55 [SHK2000] 18527+0301 Mas 18 55 15.6 +03 04 42           ~ 6 0
56 NVSS J185631+061017 Rad 18 56 31.83887710 +06 10 16.7646823           ~ 14 1
57 [SKH2002] 35.79-0.17 Mas 18 57 16.1 +02 27 44           ~ 3 0
58 [SKH2002] 36.70+0.09 Mas 18 58 00.9 +03 23 30           ~ 4 0
59 [SKH2002] 37.60+0.42 Mas 18 58 28.5 +04 20 34           ~ 4 0
60 [SKH2002] 37.02-0.03 Mas 18 58 59.9 +03 37 40           ~ 4 0
61 GAL 037.030-00.039 reg 18 59 03.6435 +03 37 45.140           ~ 2 0
62 [SKH2002] 37.47-0.11 Mas 19 00 06.7 +03 59 27           ~ 4 0
63 [SHK2000] 18577+0358 Mas 19 00 14.4 +04 02 35           ~ 5 0
64 [SKH2002] 39.10+0.48 Mas 19 00 59.5 +05 42 28           ~ 3 0
65 [SKH2002] 38.20-0.08 Mas 19 01 22.8 +04 39 10           ~ 4 0
66 [SKH2002] 38.26-0.08 Mas 19 01 28.7 +04 42 02           ~ 3 0
67 [SHK2000] 18592+0426 Mas 19 01 47.6 +04 30 32           ~ 5 0
68 [SKH2002] 38.03-0.30 Mas 19 01 50.0 +04 23 54           ~ 4 0
69 ICRF J190711.9+012708 QSO 19 07 11.9988607394 +01 27 09.018074966           ~ 30 1
70 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 393 0
71 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 692 2
72 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 362 3

    Equat.    Gal    SGal    Ecl

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2020.02.29-11:41:00

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