2008A&A...484..773V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST15:28:20

2008A&A...484..773V - Astronomy and Astrophysics, volume 484, 773-781 (2008/6-4)

A new probe of magnetic fields during high-mass star formation. Zeeman splitting of 6.7 GHz methanol masers.

VLEMMINGS W.H.T.

Abstract (from CDS):

The role of magnetic fields during high-mass star formation is a matter of fierce debate, yet only a few direct probes of magnetic field strengths are available. The magnetic field is detected in a number of massive star-forming regions through polarization observations of 6.7GHz methanol masers. Although these masers are the most abundant of the maser species occurring during high-mass star formation, most magnetic field measurements in the high-density gas currently come from OH and H2O maser observations.The 100-m Effelsberg telescope was used to measure the Zeeman splitting of 6.7GHz methanol masers for the first time. The observations were performed on a sample of 24 bright northern maser sources.Significant Zeeman splitting is detected in 17 of the sources with an average magnitude of 0.56m/s. Using the current best estimate of the 6.7GHz methanol maser Zeeman splitting coefficient and a geometrical correction, this corresponds to an absolute magnetic field strength of 23mG in the methanol maser region.The magnetic field is dynamically important in the dense maser regions. No clear relation is found with the available OH maser magnetic field measurements. The general sense of direction of the magnetic field is consistent with other Galactic magnetic field measurements, although a few of the masers display a change of direction between different maser features. Due to the abundance of methanol masers, measuring their Zeeman splitting provides the opportunity to construct a comprehensive sample of magnetic fields in high-mass star-forming regions.

Abstract Copyright:

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

Simbad objects: 36

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Number of rows : 36

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           ~ 941 2
2 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3543 3
3 NAME Per B AGN 04 37 04.37510272 +29 40 13.8184969   21.7       ~ 470 2
4 GAL 174.20-00.08 Cld 05 30 45.9 +33 47 56           ~ 184 2
5 SH 2-231 HII 05 39 12.9 +35 45 54           ~ 118 0
6 RAFGL 5180 SFR 06 08 54.1 +21 38 25           ~ 110 0
7 NAME SH 2-255 IRS 1 Y*O 06 12 54.0060 +17 59 22.958           ~ 317 0
8 IC 2162 HII 06 13 04.1 +17 58 44           ~ 338 2
9 OHIO N 001 Rad 12 03 08.09 +07 15 30.1           ~ 16 1
10 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3714 1
11 [PNE98] 009.621+0.120 Mas 18 06 14.659 -20 31 31.57           ~ 28 0
12 GRS G012.89 +00.49 HII 18 11 51.3 -17 31 29           ~ 144 0
13 Caswell CH3OH 023.01-00.41 Mas 18 34 39.9 -09 00 44           ~ 17 0
14 [SKH2002] 25.71+0.04 Mas 18 38 03.150 -06 24 15.00           ~ 9 0
15 [SVG93] 183626.4-062714 Mas 18 39 04.7 -06 24 17           ~ 10 0
16 Caswell CH3OH 028.15+00.00 Mas 18 42 40.9 -04 15 26           ~ 11 0
17 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 437 0
18 IRAS 18456-0129 HII 18 48 12.7 -01 26 34           ~ 23 0
19 IRAS 18470-0050 * 18 49 37.049 -00 46 49.86           ~ 7 0
20 [BK2004] J185328.7+003158 Mas 18 53 28.7 +00 31 58           ~ 14 0
21 IRAS 18517+0437 SFR 18 54 13.8 +04 41 32           ~ 56 0
22 GAL 035.2-00.74 MoC 18 58 13 +01 40.6           ~ 152 0
23 IRAS 18556+0136 mul 18 58 13.1 +01 40 35           ~ 133 0
24 SNR G035.2-01.8 SNR 19 01.6 +01 14           ~ 144 0
25 W 49n HII 19 10 13.2 +09 06 12           ~ 411 3
26 SNR G049.1-00.1 SNR 19 23 19.300 +14 09 21.00           ~ 241 0
27 [OMN2000] Region 3 PoC 19 23 29.3 +14 31 38           ~ 151 0
28 W 51b SFR 19 23 32.8 +14 29 56           ~ 78 0
29 W 51e1 Rad 19 23 43.77 +14 30 25.9           ~ 115 0
30 W 51e2 Rad 19 23 43.90 +14 30 34.8           ~ 180 0
31 W 51 SNR 19 23 50 +14 06.0           ~ 1143 1
32 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 396 0
33 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 360 1
34 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 697 2
35 NAME Cep A HW 2 Y*O 22 56 17.9 +62 01 49           B0.5 195 0
36 NGC 7538 OpC 23 13 37 +61 30.0           ~ 827 0

    Equat.    Gal    SGal    Ecl

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2020.07.02-15:28:20

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