2007A&A...464..609H

Query : 2007A&A...464..609H

2007A&A...464..609H - Astronomy and Astrophysics, volume 464609-614 (2007/3-3)

The Galactic distribution of magnetic fields in molecular clouds and HII regions.

HAN J.L. and ZHANG J.S.

Abstract (from CDS):

Magnetic fields exist on all scales in our Galaxy. There is a controversy about whether the magnetic fields in molecular clouds are preserved from the permeated magnetic fields in the interstellar medium (ISM) during cloud formation. We investigate this controversy using available data in the light of the newly revealed magnetic field structure of the Galactic disk obtained from pulsar rotation measures (RMs). We collected measurements of the magnetic fields in molecular clouds, including Zeeman splitting data of OH masers in clouds and OH or HI absorption or emission lines of clouds themselves. The Zeeman data show structures in the sign distribution of the line-of-sight component of the magnetic field. Compared to the large-scale Galactic magnetic fields derived from pulsar RMs, the sign distribution of the Zeeman data shows similar large-scale field reversals. Previous such examinations were flawed in the over-simplified global model used for the large-scale magnetic fields in the Galactic disk. We conclude that the magnetic fields in the clouds may still ``remember'' the directions of magnetic fields in the Galactic ISM to some extent, and could be used as complementary tracers of the large-scale magnetic structure. More Zeeman data of OH masers in widely distributed clouds are required.

Abstract Copyright: ∼

Journal keyword(s): ISM: molecules - ISM: magnetic fields - masers - magnetic fields - Galaxy: structure

Simbad objects: 94

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Number of rows : 94
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 GAL 133.71+01.22 HII 02 25 38.1 +62 05 52           ~ 78 0
2 IC 1795 HII 02 25 43.5 +62 06 13           ~ 247 0
3 W 3k HII 02 25 44.9 +62 03 41           ~ 21 1
4 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
5 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1064 3
6 NAME Per Arm PoG 03 30 +45.0           ~ 1672 0
7 NAME OMC 1N PoC 05 35 14.5 -05 22 07           ~ 18 1
8 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
9 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
10 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1498 0
11 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1198 1
12 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 789 2
13 LBN 196.49-01.60 HII 06 14 38.29 +13 49 41.0           ~ 169 1
14 RCW 38 SFR 08 59 05.50 -47 30 39.4           ~ 327 2
15 NAME Car Arm PoG 10 00 -60.0           ~ 471 1
16 OH 285.26-00.05 Mas 10 31 29.87 -58 02 18.0           ~ 22 0
17 NGC 3576 HII 11 11 53.2 -61 18 26           ~ 245 2
18 NAME Crux Arm PoG 12 30 -60.0           ~ 91 0
19 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 323 0
20 OH 300.97+01.15 Mas 12 34 53.29 -61 39 40.0           ~ 31 0
21 IRAS 13085-6443 LP* 13 11 49.5790669320 -64 59 00.191242932           ~ 18 0
22 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 581 1
23 IRAS 15254-5621 Y*? 15 29 19.33 -56 31 22.8           ~ 108 0
24 RCW 97 HII 15 53 05.0 -54 35 24           ~ 171 0
25 NAME Nor Arm PoG 16 00 -50.0           ~ 485 0
26 NAME rho Oph Cloud B1 PoC 16 27 10.5 -24 29 30           ~ 54 1
27 OH 341.22-00.21 Y*O 16 52 17.92032 -44 26 52.4076           ~ 59 0
28 GRS G345.00 -00.20 Rad 17 05.1 -41 28           ~ 3 0
29 GRS G348.50 -01.00 Rad 17 19.3 -39 07           ~ 4 0
30 NGC 6334A HII 17 20 19.3 -35 54 55           ~ 123 0
31 NGC 6334B rG 17 20 21.810 -35 52 48.25           ~ 113 0
32 NGC 6334D HII 17 20 44.2 -35 49 18           ~ 38 0
33 NGC 6334E HII 17 20 50.9 -35 46 06           ~ 52 0
34 NGC 6334 HII 17 20 53 -36 07.9           ~ 740 0
35 OH 351.41+00.64 Mas 17 20 53.4 -35 47 01           ~ 58 0
36 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 244 1
37 NGC 6357 OpC 17 24 44 -34 12.2           ~ 303 0
38 SNR G353.2+00.9 SNR 17 24 49 -34 10.8           ~ 12 0
39 OH 353.41-00.36 Mas 17 30 26.18 -34 41 45.6           ~ 65 0
40 OH 355.34+00.15 Mas 17 33 29.06 -32 47 58.9           ~ 28 0
41 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
42 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
43 NAME Sgr B2N Mas 17 47 20.0000 -28 22 40.000           ~ 49 1
44 OH 000.66-00.03 Mas 17 47 20.12 -28 23 06.2           ~ 65 1
45 RCW 142 HII 17 50 15.3 -28 54 03           ~ 64 0
46 OH 010.62-00.38 Mas 18 10 28.65 -19 55 49.5           ~ 28 0
47 W 33b SFR 18 13 54.68 -18 01 48.1           ~ 85 0
48 W 33a Y*O 18 14 39.56547 -17 52 02.2260           ~ 746 0
49 NAME M 17 SW SFR 18 20 23.1 -16 11 43           ~ 281 0
50 AKARI-IRC-V1 J1828105-112857 SFR 18 28 10.37 -11 28 49.8           ~ 113 1
51 RAFGL 5491 mul 18 28 10.7 -11 29 01           ~ 46 0
52 LBN 028.77+03.43 HII 18 31 26.5 -02 04 22           ~ 255 2
53 GAL 028.20-00.04 HII 18 42 58.08 -04 14 04.6           ~ 61 0
54 Caswell OH 030.60-00.06 HII 18 47 19.91 -02 05 57.0           ~ 10 0
55 IRAS 18449-0115 cor 18 47 34.27 -01 12 43.2           ~ 430 1
56 RAFGL 2271 SFR 18 53 18.54 +01 14 57.9           ~ 537 0
57 GAL 035.03+00.35 cor 18 54 00.60 +02 01 19.3           ~ 48 0
58 [DLW84] G35.2N HII 18 58 13.036 +01 40 36.00           ~ 138 0
59 NAME Sgr Arm PoG 19 00 -30.0           ~ 710 1
60 W 49n HII 19 10 13.2 +09 06 12           ~ 497 3
61 IRAS 19078+0901 HII 19 10 15.6 +09 06 05           ~ 44 0
62 W 49a SFR 19 10 15.7 +09 06 05           ~ 325 2
63 NAME W 49A South HII 19 10 21.833 +09 05 03.30           ~ 59 2
64 W 49b SNR 19 11 09.5 +09 06 21           ~ 500 1
65 Caswell H2O 045.07+00.13 Mas 19 13 22.1 +10 50 55           ~ 12 0
66 Caswell OH 045.12+00.13 HII 19 13 27.85 +10 53 36.7           ~ 121 0
67 GAL 045.5+00.0 HII 19 14 20.8 +11 09 04           ~ 141 0
68 CORNISH G045.4545+00.0591 HII 19 14 21.31 +11 09 11.7           ~ 157 1
69 NAME W 51 North Rad 19 23 40.0 +14 30 51           ~ 169 0
70 W 51e1 HII 19 23 43.785 +14 30 26.11           ~ 141 0
71 W 51e2 Ma* 19 23 43.906 +14 30 34.48           ~ 222 0
72 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1
73 SH 2-88 B HII 19 46 48.2 +25 12 21           ~ 159 2
74 NAME K 3-50A HII 20 01 45.6 +33 32 42           ~ 85 0
75 W 58a HII 20 01 45.8 +33 32 43           ~ 294 4
76 [KCW94] 069.540-00.975 HII 20 10 08.95 +31 31 35.4           ~ 168 1
77 IRAS 20081+3122 Y*O 20 10 09.036 +31 31 34.14           ~ 172 0
78 Onsala 1 cor 20 10 09.2036 +31 31 36.090           ~ 194 0
79 GAL 075.78+00.34 cor 20 21 44.00 +37 26 38.0           ~ 131 1
80 NAME SH 2-106 IR Y*O 20 27 26.502 +37 22 42.03           ~ 168 1
81 SH 2-106 HII 20 27 26.8 +37 22 49           ~ 453 1
82 RAFGL 2591 Y*O 20 29 24.8230 +40 11 19.590           ~ 640 0
83 IRAS 20350+4126 HII 20 36 52.6 +41 36 33           ~ 40 1
84 18P 73 Rad 20 36 55.9 +41 36 29           ~ 50 0
85 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 423 1
86 NAME DR 21(OH) M Rad 20 39 01 +42 29.8           ~ 91 0
87 DR 21 (OH) cor 20 39 01.01 +42 22 50.2           ~ 427 0
88 SH 2-140 OpC 22 19 07.8 +63 17 07           ~ 668 2
89 IRAS 22176+6303 Y*O 22 19 18.23 +63 18 47.5           ~ 600 0
90 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 760 2
91 GAL 109.88+02.11 HII 22 56 19.4 +62 02 01           ~ 76 0
92 NGC 7538 OpC 23 13 37 +61 30.0           ~ 920 1
93 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 433 3
94 NAME Scutum Spiral Arm PoG ~ ~           ~ 393 0

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