2025MNRAS.541..306M

Query : 2025MNRAS.541..306M

2025MNRAS.541..306M - Mon. Not. R. Astron. Soc., 541, 306-336 (2025/July-3)

A new window into the sub-parsec scale magnetic field in the Milky Way? Unveiling small-scale magneto-ionic structures with Faraday complexity.

MA Y.K., SETA A., McCLURE-GRIFFITHS N.M., VAN ECK C.L., MAO S.A., ORDOG A., BROWN J.C., KOVACS T.O., AKAHORI T., KURAHARA K., OBERHELMAN L. and ANDERSON C.S.

Abstract (from CDS):

Radio broad-band spectro-polarimetric observations are sensitive to the spatial fluctuations of the Faraday depth (FD) within the telescope beam. Such FD fluctuations are referred to as 'Faraday complexity', and can unveil small-scale magneto-ionic structures in both the synchrotron-emitting and the foreground volumes. We explore the astrophysical origin of the Faraday complexity exhibited by 191 polarized extragalactic radio sources (EGSs) within $5^\circ$ from the Galactic plane in the longitude range of $20^\circ$-$52^\circ$, using broad-band data from the Karl G. Jansky Very Large Array presented by a previous work. A new parameter called the FD spread is devised to quantify the spatial FD fluctuations. We find that the FD spread of the EGSs (i) demonstrates an enhancement near the Galactic mid-plane, most notable within Galactic latitude of $\pm 3^\circ$, (ii) exhibits hints of modulations across Galactic longitude, (iii) does not vary with the source size across the entire range of $2.5$-$300\,\,\mathrm{ arcsec}$, and (iv) has an amplitude higher than expected from magneto-ionic structures of extragalactic origin. All these suggest that the primary cause of the Faraday complexity exhibited by our target EGSs is $< 2.5\,\,\mathrm{ arcsec}$-scale magneto-ionic structures in the Milky Way. We argue that the anisotropic turbulent magnetic fields generated by galactic-scale shocks and shears, or the stellar feedback-driven isotropic turbulent magnetic fields, are the most likely candidates. Our work highlights the use of broad-band radio polarimetric observations of EGSs as a powerful probe of multiscale magnetic structures in the Milky Way.

Abstract Copyright: © The Author(s) 2025. Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): ISM: magnetic fields - Galaxy: structure - galaxies: magnetic fields - radio continuum: ISM

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 202

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Number of rows : 202
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 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
2 NAME Gal Anticenter reg 05 46 +28.9           ~ 1024 0
3 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1274 0
4 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
5 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
6 NVSS J181343-090743 Rad 18 13 43.34 -09 07 43.7           ~ 2 0
7 NVSS J181419-073733 Rad 18 14 19.51 -07 37 33.8           ~ 2 0
8 PMN J1818-0907 Rad 18 18 50.675 -09 07 15.99           ~ 5 1
9 PMN J1819-0910 Rad 18 19 31.02 -09 10 59.1           ~ 4 1
10 PMN J1819-0655 Rad 18 19 49.483 -06 55 25.50           ~ 7 1
11 4C -04.67 Rad 18 20 13.763 -04 25 42.41           ~ 8 1
12 NVSS J182043-062415 Rad 18 20 43.67 -06 24 15.8           ~ 2 0
13 NVSS J182058-050223 Rad 18 20 58.28 -05 02 24.1           ~ 4 2
14 PMN J1821-0610 Rad 18 21 04.391 -06 09 15.20           ~ 5 1
15 ICRF J182111.8-050220 BLL 18 21 11.80956138 -05 02 20.0852067           ~ 19 0
16 NVSS J182351-052429 Rad 18 23 51.87 -05 24 29.7           ~ 2 0
17 PMN J1824-0727 Rad 18 24 31.973 -07 27 14.29           ~ 7 1
18 NVSS J182443-092933 Rad 18 24 42.994 -09 29 32.62           ~ 4 1
19 NVSS J182503-085445 Rad 18 25 03.46 -08 54 45.2           ~ 2 0
20 PMN J1825-0809 Rad 18 25 30.057 -08 09 44.94           ~ 5 1
21 NVSS J182535-083948 Rad 18 25 35.28 -08 39 48.6           ~ 2 0
22 PMN J1825-0737 Rad 18 25 37.60953880 -07 37 30.0131350           ~ 36 1
23 PMN J1825-0837 Rad 18 25 42.888 -08 37 25.36           ~ 7 1
24 PMN J1826-0309 Rad 18 26 34.012 -03 09 29.54           ~ 6 1
25 NVSS J182644-030952 Rad 18 26 44.65 -03 09 52.1           ~ 2 0
26 PMN J1828-0019 Rad 18 29 00.168 -00 20 19.39           ~ 5 1
27 NVSS J182920-073400 Rad 18 29 20.385 -07 34 04.60           ~ 5 1
28 NVSS J183052-074402 Rad 18 30 52.34 -07 44 02.4           ~ 2 0
29 PMN J1832-0427 Rad 18 32 53.883 -04 26 27.87           ~ 5 1
30 NVSS J183307+011535 Rad 18 33 07.76084698 +01 15 35.3014026           ~ 16 1
31 NVSS J183321-073121 HII 18 33 21.1 -07 31 18           ~ 9 1
32 NVSS J183337+020355 Rad 18 33 37.132 +02 03 54.88           ~ 4 1
33 PMN J1834-0301 Rad 18 34 00.118 -03 03 40.08           ~ 11 1
34 NVSS J183414-030119 Rad 18 34 14.07465111 -03 01 19.6264517           ~ 17 0
35 NVSS J183415+004451 Rad 18 34 15.67 +00 44 51.1           ~ 2 0
36 NVSS J183418+004852 Rad 18 34 17.256 +00 49 05.79           ~ 5 1
37 NVSS J183437+010519 Rad 18 34 37.17 +01 05 17.5           ~ 3 1
38 4C 01.56 Rad 18 35 13.147 +01 46 15.26           ~ 5 1
39 PMN J1835-1115 Rad 18 35 19.57575892 -11 15 59.3120189           ~ 16 1
40 NVSS J183551-005941 Rad 18 35 51.448 -00 59 43.83           ~ 2 0
41 NVSS J183603-005747 Rad 18 36 03.71 -00 57 47.6           ~ 2 0
42 PMN J1836-0246 Rad 18 36 52.301 -02 46 07.30           ~ 5 1
43 NVSS J183701-015140 Rad 18 37 01.07 -01 51 40.2           ~ 2 0
44 4C -01.44 Rad 18 37 17.975 -01 50 34.01           ~ 7 1
45 NVSS J183759-112627 Rad 18 37 59.970 -11 26 24.96           ~ 5 1
46 NVSS J183827-013111 Rad 18 38 27.07 -01 31 11.4           ~ 2 0
47 NVSS J183838+000858 Rad 18 38 38.361 +00 08 57.02           ~ 4 1
48 NVSS J183840-012957 Rad 18 38 39.899 -01 30 00.09           ~ 4 1
49 SNR G027.7+00.6 SNR 18 38 47.633 -04 00 43.63           ~ 9 1
50 NVSS J183848+040424 Rad 18 38 48.82901984 +04 04 24.6675000           ~ 19 1
51 SNR G028.8+01.5 SNR 18 39 00.000 -03 00 00.00           ~ 36 1
52 PMN J1839-0830 Rad 18 39 02.829 -08 30 20.57           ~ 7 1
53 NVSS J183931-101336 Rad 18 39 31.32 -10 13 36.3           ~ 2 0
54 NVSS J183931+001447 Rad 18 39 31.417 +00 14 45.16           ~ 4 1
55 NVSS J183935+001547 Rad 18 39 35.02 +00 15 47.7           ~ 2 0
56 PMN J1839-0300 Rad 18 39 39.733 -03 00 48.30           ~ 8 1
57 NVSS J183942-101038 Rad 18 39 42.69 -10 10 40.2           ~ 3 1
58 PMN J1840-1101 Rad 18 40 59.385 -11 01 36.98           ~ 6 1
59 NVSS J184124-015255 Rad 18 41 24.44 -01 52 55.0           ~ 2 0
60 PMN J1842-0756 Rad 18 42 48.722 -07 56 06.64           ~ 9 1
61 NVSS J184320+040256 Rad 18 43 16.529 +04 04 09.57           ~ 3 1
62 NVSS J184415-041757 Rad 18 44 15.07 -04 17 57.2           ~ 2 0
63 NVSS J184415-131243 Rad 18 44 15.981 -13 12 42.29           ~ 3 1
64 3C 390.1 BLL 18 44 32.222 +06 42 57.64           ~ 21 1
65 NVSS J184435+020933 Rad 18 44 35.51 +02 09 29.2           ~ 4 1
66 NVSS J184438+062651 Rad 18 44 38.27 +06 26 51.3           ~ 3 1
67 NVSS J184500+043812 Rad 18 45 00.65 +04 38 12.0           ~ 2 0
68 SNR G025.1-02.3 SNR 18 45 10 -08 00.0           ~ 17 0
69 NVSS J184511-060146 Rad 18 45 11.25 -06 01 46.2           ~ 6 1
70 NVSS J184541-093643 Rad 18 45 41.15 -09 36 43.2           ~ 2 0
71 PMN J1845-0938 Rad 18 45 47.183 -09 38 21.34           ~ 6 1
72 PMN J1845-1031 Rad 18 45 52.62 -10 31 27.6           ~ 5 1
73 NVSS J184555-115813 Rad 18 45 55.13 -11 58 13.5           ~ 2 0
74 NVSS J184604+043450 Rad 18 46 04.28 +04 34 50.6           ~ 4 1
75 PMN J1846-1158 Rad 18 46 06.288 -11 58 09.30           ~ 6 1
76 NVSS J184617-081126 Rad 18 46 17.58 -08 11 26.8           ~ 2 0
77 PMN J1846-0813 Rad 18 46 30.118 -08 13 35.68           ~ 5 1
78 PMN J1846-0946 Rad 18 46 44.698 -09 46 55.07           ~ 7 1
79 NVSS J184704-000446 Rad 18 47 04.632 -00 04 48.40           ~ 6 1
80 NVSS J184718+055022 Rad 18 47 19.300 +05 50 22.38           ~ 4 1
81 NVSS J184731+090047 Rad 18 47 30.673 +09 00 46.47           ~ 5 1
82 PMN J1847-1107 Rad 18 47 50.108 -11 06 58.67           ~ 6 1
83 NVSS J184753+071538 Rad 18 47 53.07 +07 15 37.8           ~ 5 1
84 NVSS J184755+012221 Rad 18 47 55.395 +01 22 20.51           ~ 5 1
85 NVSS J184808-105535 Rad 18 48 08.15 -10 55 35.0           ~ 2 0
86 NVSS J184812-105133 Rad 18 48 12.28 -10 51 33.7           ~ 2 0
87 NVSS J184821+001108 Rad 18 48 21.68 +00 11 08.3           ~ 2 0
88 NVSS J184906-111430 Rad 18 49 06.29 -11 14 30.8           ~ 2 0
89 PMN J1849-1112 Rad 18 49 10.830 -11 12 49.20           ~ 5 1
90 NVSS J184919+063211 Rad 18 49 19.96 +06 32 11.0           ~ 2 0
91 NVSS J184951+094850 Rad 18 49 50.765 +09 48 48.82           ~ 4 1
92 NVSS J184959-013256 Rad 18 49 59.2 -01 32 56           ~ 11 1
93 NVSS J185027-091037 cm 18 50 27.63 -09 10 37.2           ~ 4 1
94 NVSS J185030-090659 Rad 18 50 30.96 -09 06 59.9           ~ 2 0
95 PMN J1850-0509 Rad 18 50 54.270 -05 09 44.24           ~ 5 1
96 NVSS J185114+025939 Rad 18 51 14.581 +02 59 39.13           ~ 6 1
97 QSO J1851+005 QSO 18 51 46.72295 +00 35 32.3649           ~ 138 1
98 NVSS J185213+033255 Rad 18 52 13.513 +03 32 54.18           ~ 7 1
99 NVSS J185222+033347 Rad 18 52 22.19 +03 33 47.3           ~ 2 0
100 PMN J1852-1013 Rad 18 52 39.57 -10 13 22.2           ~ 6 1
101 NVSS J185306+044052 Rad 18 53 06.34 +04 40 52.0           ~ 2 0
102 NVSS J185351-002508 Rad 18 53 51.5 -00 25 06           ~ 7 1
103 NVSS J185513+052158 Rad 18 55 13.54 +05 21 58.2           ~ 2 0
104 NVSS J185515+021054 Rad 18 55 15.3 +02 10 49           ~ 8 1
105 NVSS J185523-053804 Rad 18 55 23.23 -05 38 04.2           ~ 2 0
106 NVSS J185557+102011 Rad 18 55 57.869 +10 20 12.00           ~ 5 1
107 NVSS J185728+111021 Rad 18 57 27.951 +11 10 12.22           ~ 5 2
108 PMN J1857-0525 Rad 18 57 44.525 -05 25 28.21           ~ 5 1
109 NVSS J185751-004817 Rad 18 57 51.35860 -00 48 21.9496           ~ 15 1
110 NVSS J185802+031316 Rad 18 58 02.35276406 +03 13 16.3017563           ~ 34 1
111 NVSS J185822-013654 Rad 18 58 22.668 -01 36 54.37           ~ 5 1
112 NVSS J185837+024518 Rad 18 58 37.61 +02 45 19.4           ~ 6 1
113 NVSS J185857+000727 Rad 18 58 57.05 +00 07 27.8           ~ 5 1
114 3C 394 Rad 18 59 23.363 +12 59 12.10           ~ 63 1
115 NVSS J185952+112514 Rad 18 59 52.46 +11 25 14.6           ~ 4 1
116 NAME Sgr Arm PoG 19 00 -30.0           ~ 710 1
117 PMN J1900-0334 Rad 19 00 14.969 -03 35 04.30           ~ 6 1
118 NVSS J190017+000355 Rad 19 00 17.5702 +00 03 55.908           ~ 6 1
119 NVSS J190042-005151 Rad 19 00 42.674 -00 51 51.41           ~ 6 1
120 NVSS J190043+064546 Rad 19 00 43.591 +06 45 48.06           ~ 6 1
121 NVSS J190235+145023 Rad 19 02 36.40 +14 50 19.9           ~ 3 1
122 NVSS J190247+145137 Rad 19 02 43.477 +14 50 32.52           ~ 3 1
123 4C 11.55 Rad 19 03 23.333 +11 29 01.09           ~ 6 1
124 NVSS J190343+055256 Rad 19 03 43.2 +05 52 57           ~ 10 1
125 NVSS J190355+160147 Rad 19 03 55.447 +16 01 45.82           ~ 6 1
126 NVSS J190407-011342 Rad 19 04 07.930 -01 13 42.20           ~ 6 1
127 ICRF J190414.3+153638 Bz? 19 04 14.3611350 +15 36 38.451226           ~ 18 1
128 NVSS J190426+011036 Rad 19 04 26.54 +01 10 36.3           ~ 2 0
129 4C 15.63 Rad 19 04 51.523 +15 21 50.63           ~ 7 1
130 NVSS J190501+132047 Rad 19 05 01.645 +13 20 46.00           ~ 6 1
131 2MASS J19051643+1637034 BLL 19 05 16.4280102955 +16 37 03.337511482           ~ 10 1
132 NVSS J190532-000941 Rad 19 05 32.208 -00 09 41.88           ~ 6 1
133 NVSS J190559+000721 Rad 19 05 59.673 +00 07 21.89           ~ 4 1
134 NVSS J190614+084226 Rad 19 06 14.41 +08 42 26.2           ~ 3 0
135 NVSS J190653+152650 Rad 19 06 53.91 +15 26 50.4           ~ 2 0
136 NVSS J190655+152342 Rad 19 06 55.39 +15 23 42.3           ~ 5 0
137 NVSS J190655+000339 Rad 19 06 55.47 +00 03 39.7           ~ 2 0
138 ICRF J190711.9+012708 QSO 19 07 11.99616361 +01 27 08.9617282           ~ 49 1
139 NVSS J190721+012341 Rad 19 07 21.36 +01 23 41.7           ~ 2 0
140 NVSS J190734+060446 Rad 19 07 33.921 +06 04 45.71           ~ 6 1
141 NVSS J190741+000038 Rad 19 07 41.448 +00 00 37.35           ~ 6 1
142 SNR G042.8+00.6 SNR 19 07 41.890 +09 07 17.29           ~ 134 1
143 NVSS J190831-004855 Rad 19 08 31.70 -00 48 55.4           ~ 2 0
144 NVSS J190832-005319 Rad 19 08 32.10 -00 53 19.7           ~ 2 0
145 NVSS J190832-011929 Rad 19 08 32.413 -01 19 29.96           ~ 4 1
146 NVSS J190833-023000 Rad 19 08 33.670 -02 30 01.59           ~ 3 1
147 4C 16.62 Rad 19 09 01.079 +16 39 45.38           ~ 8 1
148 4C 00.71 Rad 19 09 50.17 +00 55 52.6           ~ 4 1
149 NVSS J191000+122524 Rad 19 10 00.570 +12 25 25.47           ~ 6 1
150 4C 11.57 Rad 19 10 05.082 +11 47 49.95           ~ 10 1
151 NVSS J191010-005622 Rad 19 10 10.24 -00 56 22.1           ~ 2 0
152 NVSS J191025+140125 Rad 19 10 25.99 +14 01 25.3           ~ 5 1
153 NVSS J191133+001449 Rad 19 11 33.333 +00 14 46.63           ~ 4 1
154 4C 16.63 Rad 19 11 33.617 +16 14 30.98           ~ 10 1
155 ICRF J191158.2+161146 Bz? 19 11 58.25740170 +16 11 46.8652526           ~ 48 1
156 NVSS J191219+161628 Rad 19 12 20.007 +16 16 28.53           ~ 7 1
157 NVSS J191310+064158 Rad 19 13 10.03 +06 41 58.6           ~ 2 0
158 NVSS J191325+034308 Rad 19 13 25.87 +03 43 05.6           ~ 6 1
159 NVSS J191406+025549 Rad 19 14 06.20 +02 55 50.0           ~ 3 1
160 NVSS J191414+163640 Rad 19 14 14.45952298 +16 36 39.0261897           ~ 19 1
161 NVSS J191417+002421 Rad 19 14 17.99 +00 24 21.2           ~ 2 0
162 NVSS J191549+160834 Rad 19 15 49.781 +16 08 32.56           ~ 5 1
163 NVSS J191630+090223 Rad 19 16 30.87 +09 02 23.1           ~ 4 1
164 NVSS J191641+090147 Rad 19 16 41.23 +09 01 47.6           ~ 2 0
165 NVSS J191644+150349 Rad 19 16 44.306 +15 03 50.20           ~ 8 1
166 NVSS J191649+155836 Rad 19 16 49.146 +15 58 38.20           ~ 7 1
167 NVSS J191725+044236 Rad 19 17 25.382 +04 42 37.11           ~ 4 1
168 NVSS J191733+114215 Rad 19 17 33.88 +11 42 15.5           ~ 2 0
169 NVSS J191833+043928 Rad 19 18 33.37 +04 39 28.8           ~ 2 0
170 NVSS J191840+043932 Rad 19 18 40.15 +04 39 32.9           ~ 2 0
171 4C 02.48 Rad 19 18 49.907 +03 04 41.72           ~ 5 1
172 NVSS J191906+081920 Rad 19 19 06.401 +08 19 22.59           ~ 6 1
173 NVSS J191917+061942 Rad 19 19 17.35038161 +06 19 42.7754594           ~ 17 1
174 NVSS J192032+162557 Rad 19 20 32.30 +16 25 57.1           ~ 2 0
175 NVSS J192049+042052 Rad 19 20 48.835 +04 20 52.48           ~ 4 1
176 4C 16.64 Rad 19 22 04.012 +16 22 45.85           ~ 6 1
177 NVSS J192233+071048 Rad 19 22 33.784 +07 10 48.01           ~ 4 1
178 4C 04.68 Rad 19 22 43.843 +04 51 25.80           ~ 10 1
179 NVSS J192245+073933 Rad 19 22 45.07 +07 39 35.5           ~ 5 1
180 NVSS J192258+044354 Rad 19 22 57.99 +04 43 51.9           ~ 4 1
181 4C 09.64 Rad 19 23 55.294 +09 44 23.86           ~ 9 1
182 ICRF J192439.4+154043 Bz? 19 24 39.45588 +15 40 43.9420           ~ 50 1
183 NVSS J192458+130033 Rad 19 24 58.459 +13 00 37.31           ~ 7 1
184 4C 13.73 Rad 19 25 17.270 +13 59 19.92           ~ 14 1
185 NVSS J192540+122738 Rad 19 25 40.81705290 +12 27 38.0868063           ~ 27 1
186 NVSS J192802+070219 Rad 19 28 02.87 +07 02 19.2           ~ 3 1
187 NVSS J192820+070355 Rad 19 28 20.955 +07 03 46.13           ~ 4 1
188 NVSS J192835+142156 Rad 19 28 35.62 +14 21 56.6           ~ 3 0
189 NVSS J192840+084849 Rad 19 28 40.707 +08 48 48.70           ~ 4 1
190 NVSS J192910+141952 Rad 19 29 11.084 +14 19 51.78           ~ 5 1
191 4C 09.65 Rad 19 29 22.364 +09 58 09.71           ~ 8 1
192 4C 15.66 Rad 19 30 52.76698092 +15 32 34.4273751           ~ 24 1
193 4C 13.74 Rad 19 33 02.599 +13 13 41.64           ~ 7 1
194 NVSS J193306+145624 Rad 19 33 06.437 +14 56 25.16           ~ 6 1
195 NVSS J193321+150446 Rad 19 33 21.80499555 +15 04 46.4008474           ~ 13 1
196 NVSS J193328+120953 Rad 19 33 28.97 +12 09 53.9           ~ 2 0
197 NVSS J193335+120844 Rad 19 33 35.60 +12 08 45.6           ~ 3 1
198 NVSS J193357+105642 Rad 19 33 53.613 +10 55 45.08           ~ 2 1
199 NVSS J193434+104340 Rad 19 34 34.807 +10 43 39.64           ~ 4 1
200 NVSS J193939+134604 Rad 19 39 39.203 +13 46 02.94           ~ 4 1
201 NVSS J194012+125809 Rad 19 40 12.925 +12 58 07.71           ~ 5 1
202 NAME Scutum Spiral Arm PoG ~ ~           ~ 393 0

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