2012A&A...541A..47S


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.18CET08:33:59

2012A&A...541A..47S - Astronomy and Astrophysics, volume 541A, 47-47 (2012/5-1)

EVN observations of 6.7 GHz methanol maser polarization in massive star-forming regions.

SURCIS G., VLEMMINGS W.H.T., VAN LANGEVELDE H.J. and HUTAWARAKORN KRAMER B.

Abstract (from CDS):

The role of magnetic fields in the formation of high-mass stars is still under debate, and recent measurements of their orientation and strength by using polarized maser emissions are contributing new insights. Masers polarization, in particular of the 6.7-GHz methanol masers, are one of the best probes of the magnetic field morphologies around massive protostars. Determining the magnetic field morphology around an increasing number of massive protostars at milliarcsecond resolution by observing 6.7-GHz methanol masers is crucial to better understand the role of magnetic fields in massive star formation. The First EVN Group consists of 4 massive star-forming complexes: W51, W48, IRAS18556+0138, and W3(OH). These contain well-studied HII regions from some of which molecular bipolar outflows were also detected (W51-e2, G35.20-0.74N). Nine of the European VLBI Network (EVN) antennas were used to measure the linear polarization and Zeeman-splitting of the 6.7-GHz methanol masers in the star-forming regions of the First EVN Group. We detected a total of 154 CH3OH masers, one third of these towards W3(OH). Fractional linear polarization (1.2-11.5%) was detected towards 55 CH3OH masers. The linear polarization vectors are well-ordered in all the massive star-forming regions. We measured significant Zeeman-splitting in 3 massive star-forming regions (W51, W48, and W3(OH)) revealing a range of separations -3.5m/s<ΔVz<3.8m/s with the smallest |ΔVz|=0.4m/s. We were also able to compare our magnetic field results with those obtained from submillimeter wavelength dust observation in W51 and show that the magnetic field at low and high resolutions are in perfect agreement.

Abstract Copyright:

Journal keyword(s): stars: formation - masers - polarization - magnetic fields

Simbad objects: 31

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Number of rows : 31

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           ~ 929 2
2 NAME Per Arm PoG 03 30 +45.0           ~ 1197 0
3 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3618 1
4 GAL 035.2-00.74 MoC 18 58 13 +01 40.6           ~ 151 0
5 [DLW84] G35.2N HII 18 58 13.036 +01 40 36.00           ~ 89 0
6 IRAS 18556+0136 mul 18 58 13.1 +01 40 35           ~ 132 0
7 W 48e HII 19 00 47.5 +01 12 47           ~ 3 0
8 SNR G035.2-01.8 SNR 19 01.6 +01 14           ~ 142 0
9 NAME W 48 West Core Rad 19 01 42.5 +01 13 33           ~ 8 0
10 [HC96] G35.20-1.74 1 Mas 19 01 45.5 +01 13 32           ~ 5 0
11 GAL 035.2-01.7 HII 19 01 46.50 +01 13 24.6           ~ 17 0
12 GAL 035.19-01.75 HII 19 01 47.4 +01 13 00           ~ 22 0
13 W 48b HII 19 01 53.6 +01 15 33           ~ 3 0
14 W 48c HII 19 02 15.4 +01 22 24           ~ 4 0
15 W 48d HII 19 02 20.6 +01 19 09           ~ 3 0
16 GAL 049.4-00.3 Cld 19 23 14 +14 26.9           ~ 18 0
17 SNR G049.1-00.1 SNR 19 23 19.300 +14 09 21.00           ~ 234 0
18 [OMN2000] Region 3 PoC 19 23 29.3 +14 31 38           ~ 148 0
19 W 51b SFR 19 23 32.8 +14 29 56           ~ 76 0
20 OKYM W51 IRS 2 6 IR 19 23 39.816 +14 31 05.07           ~ 21 0
21 NAME W 51 North Rad 19 23 40.0 +14 30 51           ~ 140 0
22 [WBN74] W 51 IRS 2 SFR 19 23 40.05 +14 31 07.1           ~ 251 0
23 NAME W 51 IRS 1 PoC 19 23 41.9 +14 30 36           ~ 94 0
24 W 51e1 Rad 19 23 43.77 +14 30 25.9           ~ 112 0
25 NAME W 51 Main reg 19 23 43.8 +14 30 37           ~ 129 0
26 W 51e2 Rad 19 23 43.90 +14 30 34.8           ~ 176 0
27 W 51 SNR 19 23 50 +14 06.0           ~ 1119 1
28 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 358 1
29 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 1975 1
30 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 692 2
31 NGC 7538 OpC 23 13 37 +61 30.0           ~ 815 0

    Equat.    Gal    SGal    Ecl

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2019.11.18-08:33:59

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