2021MNRAS.502.3814L

Query : 2021MNRAS.502.3814L

2021MNRAS.502.3814L - Mon. Not. R. Astron. Soc., 502, 3814-3828 (2021/April-2)

Heightened Faraday complexity in the inner 1 kpc of the galactic centre.

LIVINGSTON J.D., McCLURE-GRIFFITHS N.M., GAENSLER B.M., SETA A. and ALGER M.J.

Abstract (from CDS):

We have measured the Faraday rotation of 62 extra-galactic background sources in 58 fields using the CSIRO Australia Telescope Compact Array (ATCA) with a frequency range of 1.1-3.1 GHz with 2048 channels. Our sources cover a region ∼12 ×12 deg2 (∼1 kpc) around the Galactic Centre region. We show that the Galactic Plane for |l| < 10° exhibits large Rotation Measures (RMs) with a maximum |RM| of 1691.2 ±4.9 rad m–2 and a mean |RM| = 219 ±42 rad m–2. The RMs decrease in magnitude with increasing projected distance from the Galactic Plane, broadly consistent with previous findings. We find an unusually high fraction (95 per cent) of the sources show Faraday complexity consistent with multiple Faraday components. We attribute the presences of multiple Faraday rotating screens with widely separated Faraday depths to small-scale turbulent RM structure in the Galactic Centre region. The second-order structure function of the RM in the Galactic Centre displays a line with a gradient of zero for angular separations spanning 0.83°-11° (∼120-1500 pc), which is expected for scales larger than the outer scale (or driving scale) of magneto-ionic turbulence. We place an upper limit on any break in the SF gradient of 66 arcsec, corresponding to an inferred upper limit to the outer scale of turbulence in the inner 1 kpc of the Galactic Centre of 3 pc. We propose stellar feedback as the probable driver of this small-scale turbulence.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): turbulence - ISM: magnetic fields - Galaxy: centre

Simbad objects: 62

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Number of rows : 62
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 Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
3 PMN J1728-2845 Rad 17 28 28.974 -28 46 10.91           ~ 5 1
4 PMN J1728-2712 Rad 17 28 35.904 -27 12 35.53           ~ 4 1
5 PMN J1729-2657 Rad 17 29 08.216327 -26 57 50.74426           ~ 15 1
6 PMN J1729-2345 Rad 17 29 20.49 -23 45 35.0           ~ 4 1
7 PMN J1731-2457 Rad 17 31 07.200 -24 57 02.39           ~ 4 1
8 PMN J1731-2640 Rad 17 31 32.943 -26 40 14.15           ~ 4 1
9 PMN J1732-2855 Rad 17 32 03.884 -28 55 20.08           ~ 4 1
10 PMN J1732-2426 Rad 17 32 05.752 -24 26 52.04           ~ 5 1
11 PMN J1735-2510 Rad 17 35 24.934 -25 10 35.87           ~ 4 1
12 NVSS J173659-281003 Rad 17 36 59.21 -28 10 03.3           ~ 1 0
13 NVSS J173713-224734 Rad 17 37 13.467 -22 47 31.37           ~ 3 1
14 PMN J1737-2604 Rad 17 37 18.410 -26 04 26.92           ~ 4 1
15 PMN J1737-2229 Rad 17 37 22.655 -22 30 00.48           ~ 5 1
16 PMN J1737-2547 Rad 17 37 53.21 -25 46 42.2           ~ 4 1
17 NVSS J173754-221851 Rad 17 37 54.03 -22 18 51.1           ~ 1 0
18 PMN J1738-2624 Rad 17 38 06.00 -26 24 44.7           ~ 4 1
19 NVSS J173811-262441 Rad 17 38 11.42 -26 24 41.5           ~ 1 0
20 PMN J1738-2219 Rad 17 38 50.714 -22 19 16.61           ~ 4 1
21 PMN J1742-2713 Rad 17 42 01.914 -27 13 17.50           ~ 5 1
22 PMN J1742-2037 Rad 17 42 24.710 -20 37 27.87           ~ 5 1
23 NVSS J174317-305819 Rad 17 43 17.8 -30 58 17           ~ 8 1
24 PMN J1743-1828 Rad 17 43 43.197 -18 28 38.83           ~ 4 1
25 NVSS J174411-255208 Rad 17 44 11.81 -25 52 08.0           ~ 1 0
26 QSO J1744-3116 Bla 17 44 23.57824 -31 16 36.2943           ~ 168 1
27 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
28 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
29 NAME the Brick MoC 17 46 09 -28 43.8           ~ 226 0
30 PMN J1746-1930 Rad 17 46 18.11 -19 30 07.3           ~ 4 1
31 NVSS J174712-190550 Rad 17 47 12.22 -19 05 50.9           ~ 1 0
32 NVSS J174713-192135 Rad 17 47 13.80 -19 21 35.8           ~ 4 0
33 NVSS J174716-191954 Rad 17 47 16.09 -19 19 54.9           ~ 2 0
34 NVSS J174748-312315 Rad 17 47 48.228 -31 23 18.25           ~ 6 1
35 PMN J1748-3243 Rad 17 48 31.552 -32 41 01.86           ~ 4 1
36 PMN J1748-2252 Rad 17 48 32.599 -22 52 11.79           ~ 4 1
37 PMN J1749-2000 Rad 17 49 15.02 -20 00 33.7           ~ 4 1
38 PMN J1749-2109 Rad 17 49 31.786 -21 08 47.46           ~ 6 1
39 PMN J1751-2353 Rad 17 51 04.04 -23 52 15.2           ~ 3 0
40 NVSS J175114-323538 Rad 17 51 14.308 -32 35 42.25           ~ 5 1
41 PMN J1751-2524 Rad 17 51 51.26253123 -25 24 00.0635706           ~ 91 1
42 PMN J1752-2104 Rad 17 52 18.46 -21 05 08.6           ~ 4 1
43 PMN J1752-2230 Rad 17 52 33.230 -22 30 12.32           ~ 8 1
44 NVSS J175423-235205 Rad 17 54 23.21 -23 52 05.5           ~ 1 0
45 NVSS J175427-235235 Rad 17 54 27.387 -23 52 34.51           ~ 5 1
46 PMN J1755-2232 Rad 17 55 26.284538 -22 32 10.61562           ~ 38 1
47 NVSS J175533-233259 Rad 17 55 33.73 -23 32 59.0           ~ 1 0
48 NVSS J175548-233322 Rad 17 55 48.625 -23 33 20.93           ~ 5 1
49 NVSS J175622-312215 Rad 17 56 21.869 -31 22 09.39           ~ 4 1
50 PMN J1757-2239 Rad 17 57 27.795 -22 38 59.82           ~ 7 1
51 PMN J1803-2748 Rad 18 03 16.992512 -27 48 13.98538           ~ 10 1
52 NVSS J180319-265214 Rad 18 03 19.89 -26 52 15.1           ~ 4 1
53 PMN J1803-2946 Rad 18 03 55.760 -29 47 46.86           ~ 3 1
54 NVSS J180542-232244 Rad 18 05 42.694 -23 22 55.08           ~ 3 1
55 PMN J1807-2309 Rad 18 07 15.60 -23 08 38.2           ~ 4 1
56 PMN J1809-3024 Rad 18 09 53.499 -30 25 21.68           ~ 5 1
57 NVSS J181726-282508 Rad 18 17 26.46 -28 25 10.4           ~ 2 1
58 PMN J1820-2910 Rad 18 20 40.086 -29 10 05.28           ~ 5 1
59 QSO J1820-2528 QSO 18 20 57.84869964 -25 28 12.5840414   18.56       ~ 115 1
60 ICRF J182319.6-272626 BLL 18 23 19.65185825 -27 26 26.4035463           ~ 15 1
61 PKS 1827-36 rG 18 30 58.9044114912 -36 02 30.801933924           ~ 85 1
62 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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