2018A&A...612A..67G


Query : 2018A&A...612A..67G

2018A&A...612A..67G - Astronomy and Astrophysics, volume 612A, 67-67 (2018/4-1)

The jets of AGN as giant coaxial cables.

GABUZDA D.C., NAGLE M. and ROCHE N.

Abstract (from CDS):


Context. The currents carried by the jets of active galactic nuclei (AGNs) can be probed using maps of the Faraday rotation measure (RM), since a jet current will be accompanied by a toroidal magnetic field, which will give rise to a systematic change in the RM across the jet.
Aims. The aim of this study is to identify new AGNs displaying statistically significant transverse RM gradients across their parsec-scale jets, in order to determine how often helical magnetic fields occur in AGN jets, and to look for overall patterns in the implied directions for the toroidal field components and jet currents.
Methods. We have carried out new analyses of Faraday RM maps derived from previously published 8.1, 8.4, 12.1 and 15.3GHz data obtained in 2006 on the NRAO Very Long Baseline Array (VLBA). In a number of key ways, our procedures were identical to those of the original authors, but the new imaging and analysis differs from the original methods in several ways: the technique used to match the resolutions at the different frequencies, limits on the widths spanned by the RM gradients analyzed, treatment of core-region RM gradients, approach to estimation of the significances of the gradients analyzed, and inclusion of a supplementary analysis using circular beams with areas equal to those of the corresponding elliptical naturally weighted beams.
Results. This new analysis has substantially increased the number of AGNs known to display transverse RM gradients that may reflect the presence of a toroidal magnetic-field component. The collected data on parsec and kiloparsec scales indicate that the current typically flows inward along the jet axis and outward in a more extended region surrounding the jet, typical to the current structure of a co-axial cable, accompanied by a self-consistent system of nested helical magnetic fields, whose toroidal components give rise to the observed transverse Faraday rotation gradients.
Conclusions. The new results presented here make it possible for the first time to conclusively demonstrate the existence of a preferred direction for the toroidal magnetic-field components - and therefore of the currents - of AGN jets. Discerning the origin of this current-field system is of cardinal importance for understanding the physical mechanisms leading to the formation of the intrinsic jet magnetic field, which likely plays an important role in the propagation and collimation of the jets; one possibility is the action of a "cosmic battery".

Abstract Copyright: © ESO 2018

Journal keyword(s): magnetic fields - polarization - galaxies: active - galaxies: jets

Simbad objects: 52

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Number of rows : 52
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 7C 0059+5808 QSO 01 02 45.7622788272 +58 24 11.137682016   20.09 19.22 18.57 17.90 ~ 208 1
2 QSO B0133+476 Bla 01 36 58.5947351640 +47 51 29.099491848     18.0 19.25 15.21 ~ 469 1
3 6C 021252+733537 BLL 02 17 30.8129232696 +73 49 32.622815712     19.0 18.97   ~ 427 1
4 QSO B0256+075 QSO 02 59 27.0767562768 +07 47 39.646138560   18 18 16.9   ~ 169 1
5 4C 47.08 BLL 03 03 35.2422414360 +47 16 16.276532592   17.54 16.95 16.2   ~ 254 1
6 NGC 1218 Sy1 03 08 26.2245464640 +04 06 39.305753460   12.84       ~ 365 1
7 4C 32.14 QSO 03 36 30.1074972672 +32 18 29.341371132     17.50 16.6   ~ 613 1
8 4C 50.11 QSO 03 59 29.7469819512 +50 57 50.159106936           ~ 417 1
9 QSO B0403-132A BLL 04 05 34.0032757488 -13 08 13.690831596   17.37 17.09 16.6   ~ 327 1
10 3C 111 Sy1 04 18 21.2772425736 +38 01 35.801359968   19.75 18.05     ~ 901 1
11 Mrk 1506 Sy1 04 33 11.0956735296 +05 21 15.619461552   15.72 15.05 10.08   ~ 1935 2
12 QSO B0446+113 BLL 04 49 07.6702793952 +11 21 28.604840004     20 18.58   ~ 236 1
13 7C 055201.39+394824.00 QSO 05 55 30.8055972888 +39 48 49.166341920     18.0 17.5   ~ 488 2
14 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 14.17 14.27   ~ 1223 1
15 QSO J0738+1742 BLL 07 38 07.3935719136 +17 42 18.998218764   16.76 16.22 15.78   ~ 946 1
16 ICRF J074110.7+311200 Sy1 07 41 10.7033429280 +31 12 00.230596416   17.02 16.89 16.322   ~ 429 1
17 QSO B0745+241 QSO 07 48 36.1087026816 +24 00 24.109630416   19.70 18.89 17.88   ~ 192 1
18 QSO B0748+126 QSO 07 50 52.0455280992 +12 31 04.828034820   17.67 17.28 17.16   ~ 303 1
19 4C 22.21 BLL 08 23 24.7592164368 +22 23 03.287299236   20.22 19.57 19.7   ~ 173 1
20 QSO B0823+033 BLL 08 25 50.3384535600 +03 09 24.523229736   17.81 17.23 16.91   ~ 307 1
21 QSO B0834-201 QSO 08 36 39.2154503832 -20 16 59.501243352   19.45 19.4 18.76   ~ 187 1
22 4C 71.07 QSO 08 41 24.3652863600 +70 53 42.171665460     16.5 16.8   ~ 733 1
23 QSO J0902-1415 QSO 09 02 16.8308887080 -14 15 30.874458132   16.79 16.59 16.4   ~ 228 1
24 ICRF J092703.0+390220 Sy1 09 27 03.0138528936 +39 02 20.850343332   17.17 17.00 16.486   ~ 965 1
25 4C 40.24 QSO 09 48 55.3382263320 +40 39 44.589392532   18.31 18.02 17.85   ~ 324 1
26 6C 095505+473957 QSO 09 58 19.6716244680 +47 25 07.843345896   18.78 18.62 18.39   ~ 219 1
27 QSO B1124-186 QSO 11 27 04.3922636736 -18 57 17.439607512   19.17   19.23   ~ 203 1
28 8C 1150+812 QSO 11 53 12.4986308136 +80 58 29.152394328     18.5 18.54   ~ 227 1
29 Ton 599 QSO 11 59 31.8338889192 +29 14 43.826803116   14.80 14.41 17.652 13.39 ~ 860 1
30 7C 1219+2830 BLL 12 21 31.6904439888 +28 13 58.500308172   16.81 16.11 14.24   ~ 819 1
31 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5601 1
32 QSO B1334-127 QSO 13 37 39.7829208840 -12 57 24.693846264   18.5 18.5 16.22   ~ 461 1
33 QSO B1502+1041 Bla 15 04 24.9800240304 +10 29 39.197268420   18.97 18.56 18.94   ~ 518 1
34 QSO B1504-167 QSO 15 07 04.7863621776 -16 52 30.274176216   18.40 18.5 17.00   ~ 221 1
35 6C 161147+342017 QSO 16 13 41.0642858568 +34 12 47.910181572   17.98 17.46 17.07   ~ 604 1
36 4C 38.41 QSO 16 35 15.4928147784 +38 08 04.499799360   18.14 17.97 17.25   ~ 809 1
37 3C 345 QSO 16 42 58.8102993888 +39 48 37.002763188   16.81 16.59 16.84   ~ 1641 2
38 4C 39.49 BLL 16 53 52.2160772976 +39 45 36.613228860 14.09 14.15 13.29 8.26   ~ 2037 2
39 7C 1749+7006 BLL 17 48 32.8402992264 +70 05 50.768819304   17.46 17.01 15.48   ~ 404 1
40 4C 09.57 BLL 17 51 32.8186120872 +09 39 00.728629416   17.46 16.78 15.57   ~ 890 1
41 8C 1803+784 BLL 18 00 45.6838528560 +78 28 04.018028016   16.4 16.4 15.46   ~ 701 1
42 3C 371 BLL 18 06 50.6802916920 +69 49 28.109609256   14.77 14.22 11.39   ~ 821 2
43 QSO B1908-202 QSO 19 11 09.6526857480 -20 06 55.109271780   18.21   18.14   ~ 255 0
44 8C 2007+777 BLL 20 05 30.9987913056 +77 52 43.248139536     16.5 17.36   ~ 424 1
45 QSO B2005+40 QSO 20 07 44.9449261536 +40 29 48.603352020   18.5 19 20.3   ~ 283 1
46 3C 418.0 QSO 20 38 37.0347144096 +51 19 12.660083976   21.30 20.00 18.9   ~ 287 0
47 QSO B2155-152 QSO 21 58 06.2817399648 -15 01 09.329323800   18.63 17.5 17.79   ~ 304 1
48 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2143 1
49 4C -03.79 QSO 22 18 52.0376984088 -03 35 36.879875124   16.93 16.38 16.15   ~ 326 1
50 4C 11.69 QSO 22 32 36.4089639768 +11 43 50.904601176   17.75 17.33     ~ 1052 2
51 QSO B2345-167 QSO 23 48 02.6085903648 -16 31 12.023178096   18.00 18.41 16.86   ~ 379 1
52 4C 45.51 QSO 23 54 21.6801097296 +45 53 04.219359180   20.6 20.6 19.1   ~ 209 1

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2022.10.07-04:28:56

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