2008ApJ...688.1029M

Query : 2008ApJ...688.1029M

2008ApJ...688.1029M - Astrophys. J., 688, 1029-1049 (2008/December-1)

A radio and optical polarization study of the magnetic field in the Small Magellanic Cloud.

MAO S.A., GAENSLER B.M., STANIMIROVIC S., HAVERKORN M., McCLURE-GRIFFITHS N.M., STAVELEY-SMITH L. and DICKEY J.M.

Abstract (from CDS):

We present a study of the magnetic field of the Small Magellanic Cloud (SMC), carried out using radio Faraday rotation and optical starlight polarization data. Consistent negative rotation measures (RMs) across the SMC indicate that the line-of-sight magnetic field is directed uniformly away from us with a strength 0.19±0.06 µG. Applying the Chandrasekhar-Fermi method to starlight polarization data yields an ordered magnetic field in the plane of the sky of strength 1.6±0.4 µG oriented at a position angle 4°±12°, measured counterclockwise from the great circle on the sky joining the SMC to the Large Magellanic Cloud (LMC). We construct a three-dimensional magnetic field model of the SMC, under the assumption that the RMs and starlight polarization probe the same underlying large-scale field. The vector defining the overall orientation of the SMC magnetic field shows a potential alignment with the vector joining the center of the SMC to the center of the LMC, suggesting the possibility of a ``pan-Magellanic'' magnetic field. A cosmic-ray-driven dynamo is the most viable explanation of the observed field geometry, but has difficulties accounting for the observed unidirectional field lines. A study of Faraday rotation through the Magellanic Bridge is needed to further test the pan-Magellanic field hypothesis.

Abstract Copyright: ∼

Journal keyword(s): Magnetic Fields - Polarization - Galaxies: Magellanic Clouds

VizieR on-line data: <Available at CDS (J/ApJ/688/1029): table3.dat>

Nomenclature: Table 3: [MGS2008] NNN N=70 among (Nos 005-139). Table 5: [MGS2008] Anon(N) (Nos Anon(1) and (2)).

Errata: erratum vol. 745, art. 199 (2012)

CDS comments: Objects 0198 and 0208 of table 3 are a misprint for objects 019 and 020, respectively, of table 4.

Simbad objects: 161

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Number of rows : 161
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 PMN J0011-7349 rG 00 11 57.4 -73 49 58           ~ 2 1
2 [MGS2008] 082 rG 00 14 24.120 -73 39 05.15           ~ 1 0
3 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
4 PMN J0021-6926 rG 00 21 37.8 -69 26 14           ~ 6 1
5 [MGS2008] 048 rG 00 22 02.760 -74 27 22.53           ~ 1 0
6 [MGS2008] 047 rG 00 22 15.400 -74 28 14.62           ~ 1 0
7 [MGS2008] 044 rG 00 22 21.970 -74 28 21.27           ~ 1 0
8 PKS 0021-742 rG 00 23 36.4 -73 55 30           ~ 11 1
9 ATPMN J002411.8-735717 rG 00 24 11.370 -73 57 15.95           ~ 3 0
10 PMN J0024-7008 rG 00 24 28.4 -70 09 23           ~ 5 1
11 [MGS2008] 137 rG 00 26 05.650 -73 23 10.61           ~ 1 0
12 [MGS2008] 130 rG 00 26 06.340 -73 23 10.97           ~ 1 0
13 [MGS2008] 041 rG 00 26 08.350 -73 23 15.03           ~ 1 0
14 [MGS2008] 125 rG 00 28 36.060 -69 33 40.34           ~ 1 0
15 NAME SMC B0026-7101 Bla 00 28 41.5636966584 -70 45 15.927580080       16.62   ~ 51 1
16 [MGS2008] 038 rG 00 29 20.100 -75 40 08.70           ~ 1 0
17 [MGS2008] 046 rG 00 29 26.110 -69 34 46.23           ~ 1 0
18 ATPMN J002928.2-693436 Rad 00 29 28.20 -69 34 36.7           ~ 2 0
19 PMN J0031-7031 rG 00 31 36.38 -70 33 13.8           ~ 3 1
20 NAME SMC B0030-6941 rG 00 32 30.83 -69 24 30.6           ~ 6 1
21 PMN J0032-7306 rG 00 32 31.0 -73 06 51           ~ 7 2
22 [MGS2008] 123 rG 00 34 01.180 -70 26 29.06           ~ 1 0
23 [MGS2008] 138 rG 00 34 10.030 -70 25 19.64           ~ 1 0
24 PMN J0034-7334 rG 00 34 13.8 -73 33 27           ~ 9 1
25 [MGS2008] 037 rG 00 34 15.200 -73 33 16.16           ~ 1 0
26 [MGS2008] 036 rG 00 34 15.580 -73 33 34.29           ~ 1 0
27 [FBR2002] J003426-733513 rG 00 34 26.74 -73 35 13.4           ~ 2 0
28 [MGS2008] 033 rG 00 34 28.440 -73 35 26.77           ~ 2 0
29 [DMS2000b] J003754-725157 rG 00 37 54.7 -72 51 57           ~ 3 0
30 [DMS2000b] J003801-725211 rG 00 38 01.0 -72 52 11           ~ 3 0
31 PMN J0039-7141 rG 00 39 39.1 -71 41 45           ~ 9 1
32 PKS 0038-720 rG 00 40 47.97 -71 45 59.3           ~ 11 1
33 NAME SMC B0040-7018 rG 00 42 25.8 -70 02 47           ~ 5 1
34 [MGS2008] 028 rG 00 42 38.740 -70 01 34.56           ~ 1 0
35 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
36 LHA 115-S 2 s*b 00 43 11.6459400144 -73 23 10.745670156   12.02 12.0     B8Ia+ 42 0
37 PSR J0045-7042 Psr 00 45 25.69 -70 42 07.1           ~ 18 0
38 PSR J0045-7319 HXB 00 45 35.2606875816 -73 19 03.269105220   15.97 16.18   16.30 B0.5-B2IV-V 193 0
39 SK 7 s*b 00 45 46.9602407784 -73 39 54.697500036 11.763 12.614 12.636   11.77 B3Ia 24 0
40 [MGS2008] 126 rG 00 46 39.630 -69 57 12.48           ~ 1 0
41 SK 12 * 00 47 14.8265913144 -72 50 03.142816404 12.543 12.984 12.946 12.77 12.80 A0(Iab) 13 0
42 QSO J0047-7530 QSO 00 47 40.8118766040 -75 30 11.363360796     18.20     ~ 25 1
43 BBB SMC 266 s*b 00 47 50.0484011088 -73 08 21.054056928   12.35 12.55 12.36   O6I(f)+O7.5 78 0
44 SK 19 sg* 00 47 50.3540586000 -73 14 22.686008136   12.28 12.14     A2Iab 23 0
45 BBB SMC 180 * 00 48 26.5118635584 -73 03 27.063553464   12.83 12.85 12.78   B5 12 0
46 SK 26 * 00 48 53.4999178368 -72 01 02.732494908   13.22 13.40     B1 5 0
47 HD 4862 s*b 00 49 02.9699992181 -73 21 40.929638271   10.968 10.974 11.271   B5Ia 57 0
48 [FBR2002] J004933-721902 rG 00 49 33.37 -72 19 02.9           ~ 2 0
49 SK 31 s*b 00 49 51.2735728512 -72 55 45.253625124   11.16 11.16     B2Ia 46 0
50 HD 4976 s*b 00 50 06.0800706288 -73 07 45.303645288   11.12 11.00     B8Ia+ 74 0
51 SK 35 s*b 00 50 18.1229621664 -72 38 10.034313252 11.04 10.96 12.40   12.12 O9.5Iab 48 0
52 HD 5030 s*b 00 50 31.5814458672 -73 28 42.553178652   11.29 11.18     B9Ia+ 69 0
53 HD 5045 s*b 00 50 38.3868754296 -73 28 18.256667052   11.02 11.04     B1Ia+ 94 0
54 SK 46 s*b 00 51 23.1472439448 -72 07 20.916492744   12.49 12.59     B1Iab 32 0
55 SK 45 sg* 00 51 24.5968978056 -72 22 58.594918764 9.50 11.4 11.47   11.00 A0Ia 42 0
56 PMN J0052-7525 rG 00 52 22.6 -75 25 43           ~ 5 1
57 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
58 HD 5277 sg* 00 52 51.2367585408 -73 06 53.641834488 10.12 11.08 10.95   10.75 A0Ia 62 0
59 SK 55 s*y 00 53 01.9327476144 -71 38 37.525148412   12.38 11.91     F3Iab 50 0
60 HD 5291 s*b 00 53 04.8881540232 -72 38 00.139202232 10.26 10.89 10.85     B8Ia 59 0
61 SK 59 sg* 00 54 57.8907667848 -72 09 40.708022760   11.8 11.2     A0Ia 25 0
62 SK 62 s*b 00 56 11.5319664528 -72 54 37.468399716 11.783 12.694 12.68 12.55 12.75 B2Ia 24 0
63 NGC 330 Cl* 00 56 18.55 -72 27 45.1 9.37 9.76 9.55   8.89 ~ 445 0
64 [MGS2008] 136 rG 00 56 43.080 -72 52 17.22           ~ 1 0
65 [MGS2008] 025 rG 00 56 45.050 -72 51 59.06           ~ 1 0
66 NAME SMC B0055-7056 rG 00 57 15.66542 -70 40 46.2893           ~ 13 1
67 LHA 115-S 26 Cl* 00 57 30.00 -72 15 53.0 11.29       11.34 ~ 42 1
68 SK 68 s*b 00 57 31.7301247584 -71 19 59.269190304 11.32 11.96 12.09     B2.5Ia 38 0
69 SK 74 s*b 00 58 41.2290524928 -72 26 15.433261440   11.61 11.51     B8I 34 0
70 HD 5980 WR* 00 59 26.5838833944 -72 09 53.927337312   11.13 11.31   11.029 WN4+O7I: 419 1
71 SK 80 s*b 00 59 31.9751731656 -72 10 46.106730444   12.12 12.31     O7Iaf 117 0
72 RMC 17 s*b 00 59 45.7300850520 -72 44 56.416111080   12.02 12.2     B0Ia 70 0
73 RMC 18 s*b 01 00 06.8830919184 -72 13 57.371461032   11.7 11.5     B1Ia 76 0
74 RMC 19 sg* 01 00 40.7462641728 -71 32 30.153582636   11.74 11.60     A3Ia 39 0
75 SK 97 sg* 01 01 15.6634410096 -72 32 36.857991372   11.41 11.41     A5Iab 31 0
76 SK 98 sg* 01 01 16.9978346544 -72 17 31.136546040   11.44 11.42     A0Ia 43 0
77 PMN J0101-6939 rG 01 01 31.8 -69 39 17           ~ 5 1
78 SK 103 s*b 01 01 58.7783887824 -72 35 38.956138008 11.233 12.284 12.396   12.46 B0Ia 33 0
79 RMC 26 s*y 01 02 43.0422251616 -72 07 25.970159964 12.19 11.94 11.64     F0Ia 39 0
80 CPD-72 77 sg* 01 02 49.6101049512 -72 10 14.479892112 10.54 10.98 10.90   10.88 A0Ia 51 0
81 SK 107 s*b 01 02 51.9499143600 -71 48 24.790164336 11.643 12.744 12.936   13.02 B0Iw 34 0
82 RMC 31 WR* 01 03 25.2272050176 -72 06 43.857668340   12.11 12.30     WN3:h+O5.5V+O5.5If+O7.5V 126 0
83 NAME SMC B0102-7524 rG 01 03 32.0 -75 07 03           ~ 7 1
84 RMC 36 s*b 01 04 49.3494336384 -72 06 21.746153556 10.57 11.34 11.36     B3Ia 58 0
85 RMC 37 s*b 01 04 52.9090700064 -72 08 36.784118328 10.75 11.30 11.23     B9Ia 45 0
86 SK 118 s*y 01 04 55.0862048184 -72 02 36.431493072 12.15 11.67 11.09     F4Ia 51 0
87 SK 119 s*b 01 04 58.0658804448 -72 39 59.515048656 11.57 10.12 12.34   12.23 B2Ia 34 0
88 SK 120 s*b 01 05 24.7610544984 -73 03 52.973560260 12.47 13.43 13.53   13.56 B1-1.5I 27 1
89 SK 121 s*b 01 05 27.4776868728 -72 48 15.103596384   11.5 11.4     B8Ia 33 0
90 LHA 115-S 45 s*b 01 05 56.3185112880 -72 19 44.760359424   11.44 11.47     B2Ia 47 0
91 SK 128 s*b 01 06 29.2604555136 -72 22 08.607372996   11.7 11.8     B2.5Ia 32 0
92 HD 6884 s*b 01 07 18.2182685856 -72 28 03.657105156   10.32 10.2     B9Ia0ek 134 0
93 RMC 43 sg* 01 08 56.8466750280 -73 02 34.374703056   11.42 11.30     A3Ia 40 0
94 HD 7099 s*b 01 09 03.9542485824 -72 32 17.627859960   10.89 10.9     B2.5Ia 72 0
95 SK 138 s*b 01 09 15.8151632688 -72 25 14.126030148 11.90 12.68 12.78   12.78 B5Iab 20 0
96 [MGS2008] 018 rG 01 10 35.370 -72 28 07.70           ~ 2 0
97 [MGS2008] 121 rG 01 10 45.440 -72 28 52.19           ~ 2 0
98 ATPMN J011049.2-731428 rG 01 10 49.5 -73 14 28           ~ 5 0
99 NAME SMC B0109-7330 rG 01 10 50.5 -73 14 25           ~ 12 1
100 [DMS2000b] J011056-731405 rG 01 10 56.5 -73 14 05           ~ 3 0
101 SK 145 s*b 01 11 25.9167352608 -72 31 21.276515892 11.463 12.464 12.596   11.60 B2.5Ia 42 0
102 PSR J0111-7131 Psr 01 11 28.77 -71 31 46.8           ~ 14 0
103 SK 146 sg* 01 11 43.1633069856 -72 07 27.515157384   12.19 12.10     A2I 29 0
104 SK 149 * 01 12 32.9777594976 -71 09 07.366904100   13.15 13.14     A0 11 0
105 SK 150 s*b 01 13 01.8742585512 -72 45 48.441989592 11.593 12.564 12.676   11.42 B1.5Ia 41 0
106 PSR J0113-7220 Psr 01 13 11.090 -72 20 32.20           ~ 15 0
107 HD 7583 sg* 01 13 30.5007669648 -73 20 10.319785260 10.01 10.32 10.20     A2Ia 120 0
108 SK 154 sg* 01 14 21.6495148848 -73 12 45.036321624 11.47 11.7 12.0     A5Iab 39 0
109 SK 155 s*b 01 14 50.2614192144 -73 20 17.851206156 11.35 12.33 12.48     O9Iab(ff) 63 0
110 SK 156 s*b 01 15 28.6131066624 -73 19 50.059080372 10.90 11.85 11.93     B1.5Ia 37 0
111 SK 157 * 01 15 52.196 -73 20 48.32 11.13 12.97 13.66     O9.5 42 0
112 SK 159 s*b 01 15 58.8782034384 -73 21 24.351532740 10.80 11.77 11.90     B0.2Ia 84 0
113 [MGS2008] 118 rG 01 18 09.610 -69 46 04.36           ~ 1 0
114 NAME SMC B0116-7007 rG 01 18 15.98 -69 51 47.4           ~ 9 1
115 [LMM2022] J011917.9-710538.0 rG 01 19 17.560 -71 05 42.40           ~ 2 0
116 RMC 46 s*b 01 19 50.2431966504 -72 41 05.717145840   12.80 12.79     B8Iab 20 0
117 SK 165 s?b 01 20 25.0963162464 -73 06 04.569943824   13.12 13.16     B5(Ib) 9 0
118 SK 166 s?y 01 21 38.7164502240 -73 58 41.028284712   13.05 12.85 12.95   F0 11 0
119 [MGS2008] 014 rG 01 21 44.400 -69 57 21.11           ~ 1 0
120 SK 168 s*b 01 21 48.2562501672 -72 45 59.237665992   11.7 11.7     B9Ia 34 0
121 NAME SMC B0120-7012 rG 01 21 49.90 -69 56 46.0           ~ 6 1
122 [MGS2008] 120 rG 01 22 45.570 -69 44 18.52           ~ 1 0
123 NAME SMC B0121-7530 rG 01 22 56.88 -75 15 07.8           ~ 9 1
124 PMN J0128-7512 rG 01 28 08.69 -75 12 51.1           ~ 7 1
125 [MGS2008] 015 rG 01 28 16.990 -75 12 58.75           ~ 2 0
126 NAME SMC B0127-6951 rG 01 28 45.93 -69 36 16.0           ~ 6 1
127 CPD-73 82 s*y 01 29 17.2664386344 -72 43 20.185741308   11.94 11.56     F0Iae 35 0
128 LHA 115-N 90 HII 01 29 30.15 -73 33 10.5           ~ 69 2
129 [GQH2007] 52 QSO 01 29 30.1616033112 -73 33 10.678747932           ~ 6 0
130 [MGS2008] 012 rG 01 29 44.770 -70 35 31.04           ~ 1 0
131 SK 187 * 01 30 50.2525498272 -73 22 58.905756120   12.99 13.18     O8.5III: 22 0
132 LHA 115-S 64 Em* 01 31 18.3890578128 -72 49 17.876717796   12.46 12.50     OBe 17 0
133 PSR J0131-7310 Psr 01 31 28.510 -73 10 09.34           ~ 14 0
134 [FJW97] SMC B0132-7318 rG 01 33 30.530 -73 03 06.52           ~ 3 0
135 ATPMN J013338.4-692834 Rad 01 33 38.43 -69 28 34.5           ~ 2 0
136 [MGS2008] 009 Rad 01 33 47.710 -69 28 38.37           ~ 1 0
137 ATPMN J013349.0-692844 Rad 01 33 49.03 -69 28 44.7           ~ 2 0
138 PMN J0137-7303 Rad 01 37 03.62 -73 04 10.2           ~ 6 1
139 [MGS2008] 132 rG 01 37 05.690 -73 04 14.74           ~ 1 0
140 [MGS2008] 117 rG 01 39 48.320 -69 33 27.44           ~ 1 0
141 [MGS2008] 007 rG 01 41 16.350 -70 15 04.00           ~ 1 0
142 PMN J0141-7016 rG 01 41 28.5 -70 16 31           ~ 2 1
143 WDG 1 s*b 01 41 42.0683863272 -73 50 38.183979624   11.86 11.84     B1.5Ia 74 0
144 PKS J0141-6941 rG 01 41 54.89925 -69 41 31.6941           ~ 9 1
145 CPD-75 116 s*b 01 44 03.8703845040 -74 40 49.800525744   11.54 11.43 11.69   B5Ia[e] 92 0
146 CPD-75 119 s*b 01 45 03.7949608824 -74 31 32.596492404   11.74 11.74     B9Ia 29 0
147 [MGS2008] 133 rG 01 46 39.130 -72 48 55.80           ~ 1 0
148 WDG 4 s*b 01 49 12.5718229824 -74 00 37.087973496   12.04 12.11     B6Ia 30 0
149 WDG 5 sg* 01 51 08.6740111104 -73 55 50.538315108   12.80 12.64 12.78   A2Ia 15 0
150 WDG 6 s*b 01 53 10.1738192160 -73 55 06.725566200   12.23 12.29 12.53   B5Iab 22 0
151 WDG 7 s*b 01 53 34.6800416784 -74 02 58.283624004   12.37 11.96     B8I 12 0
152 WDG 8 s*b 02 13 25.4178782976 -74 31 20.303315760   12.12 12.16 12.32   B6Ia 20 0
153 PKS 0252-712 rG 02 52 46.15578 -71 04 35.2742   19.0 19.0     ~ 104 1
154 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
155 NAME Magellanic Bridge HI 03 11 -77.5           ~ 522 1
156 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
157 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
158 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1192 1
159 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
160 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
161 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2

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