2019MNRAS.487.3432M

Query : 2019MNRAS.487.3432M

2019MNRAS.487.3432M - Mon. Not. R. Astron. Soc., 487, 3432-3453 (2019/August-2)

A broad-band spectro-polarimetric view of the NVSS rotation measure catalogue - I. Breaking the nπ-ambiguity.

MA Y.K., MAO S.A., STIL J., BASU A., WEST J., HEILES C., HILL A.S. and BETTI S.K.

Abstract (from CDS):

The NRAO VLA Sky Survey (NVSS) rotation measure (RM) catalogue is invaluable for the study of cosmic magnetism. However, the RM values reported in it can be affected by nπ-ambiguity, resulting in deviations of the reported RM from the true values by multiples of ±652.9 rad m–2. We therefore set off to observationally constrain the fraction of sources in the RM catalogue affected by this ambiguity. New broad-band spectro-polarimetric observations were performed with the Karl G. Jansky Very Large Array (VLA) at 1-2 GHz, with 23 nπ-ambiguity candidates selected by their peculiarly high |RM| values. We identified nine sources with erroneous RM values due to nπ-ambiguity and 11 with reliable RM values. In addition, we found two sources to be unpolarized and one source to be inconsistent with neither nπ-ambiguity nor reliable RM cases. By comparing the statistical distributions of the above two main classes, we devised a measure of how much a source's RM deviates from that of its neighbours: Δ/σ, which we found to be a good diagnostic of nπ-ambiguity. With this, we estimate that there are at least 50 sources affected by nπ-ambiguity among the 37 543 sources in the catalogue. Finally, we explored the Faraday complexities of our sources revealed by our broad-band observations.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

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

Nomenclature: Table 2: [MMS2019] NVSS JHHMMSS+DDMMSSa N=10.

Simbad objects: 66

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Number of rows : 66
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 Z 522-118 rG 02 09 38.5601991144 +35 47 50.778945420   14.9 13.0     ~ 154 2
3 BWE 0226+0838 BLL 02 29 15.5333308896 +08 51 25.295662368           ~ 12 1
4 QSO B0235+1624 BLL 02 38 38.93010450 +16 36 59.2745528   16.46 15.50 15.92   ~ 1614 2
5 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
6 ICRF J052109.8+163822 Sy1 05 21 09.88596258 +16 38 22.0515459   19.37 18.84 18.480   ~ 910 1
7 QSO B0710+439 QSO 07 13 38.16413557 +43 49 17.2072102   20.7       ~ 256 0
8 NAME GUM Nebula ISM 07 43 -42.1           ~ 454 1
9 PKS 0834-19 rG 08 37 11.16132240 -19 51 56.7529560     19.6     ~ 59 1
10 PMN J0839-2407 Rad 08 39 30.867 -24 07 26.00           ~ 5 1
11 PKS 0843-260 rG 08 46 00.73385175 -26 10 54.1589536   17.0       ~ 22 1
12 PSZ1 G246.45+13.16 ClG 08 46 59.6 -22 00 33           ~ 7 0
13 PMN J0847-2337 Bla 08 47 01.5666850056 -23 37 01.670193084       13   ~ 65 1
14 ACO S 613 ClG 08 47 58.6 -23 07 15           ~ 6 0
15 [VV98] J090015.4-281758 QSO 09 00 15.3028571880 -28 17 58.499989980     18.90     ~ 19 1
16 [MMS2019] NVSS J091145-301305a Rad 09 11 42.470 -30 13 19.26           ~ 2 0
17 PMN J0911-3013 Rad 09 11 46.11 -30 13 01.7           ~ 5 1
18 [MMS2019] NVSS J091145-301305b Rad 09 11 46.330 -30 12 58.63           ~ 2 0
19 QSO B0919-260 Bla 09 21 29.35386197 -26 18 43.3863288   18.46 18.41 18.01   ~ 144 1
20 [MMS2019] NVSS J092410-290606a Rad 09 24 10.090 -29 05 45.36           ~ 2 0
21 PMN J0924-2906 Rad 09 24 10.765 -29 06 06.84           ~ 6 1
22 [MMS2019] NVSS J092410-290606b Rad 09 24 11.440 -29 06 26.66           ~ 2 0
23 PKS J0933-3026 Rad 09 33 48.949 -30 26 58.49           ~ 7 1
24 [MMS2019] NVSS J093544-322845b Rad 09 35 43.790 -32 29 40.03           ~ 2 0
25 [MMS2019] NVSS J093544-322845a Rad 09 35 43.980 -32 28 48.51           ~ 2 0
26 NVSS J093544-322845 Rad 09 35 44.14 -32 28 45.0           ~ 2 0
27 ACO 3421 ClG 09 38 29 -29 17.6           ~ 2 0
28 ACO S 618 ClG 09 39 29 -29 30.6           ~ 2 0
29 PMN J0947-3715 rG 09 47 50.9385459744 -37 15 26.985733020   16.21   14.80   ~ 17 1
30 PKS 0946-344 rG 09 48 08.53895 -34 40 10.5600           ~ 7 1
31 ACO 3428 ClG 09 52 52 -33 44.2           ~ 5 0
32 QSO B1015-314 QSO 10 18 09.2596731312 -31 44 14.006765436   21 20.4     ~ 73 1
33 4C 12.39 Bla 11 18 57.30143432 +12 34 41.7179609   19.39 19.25 19.10   ~ 267 1
34 ICRF J112027.8+142054 Sy2 11 20 27.80814059 +14 20 54.9730732   20 20.935 20.100   ~ 175 1
35 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1290 0
36 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1841 2
37 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
38 Mrk 668 BLL 14 07 00.39441712 +28 27 14.6901341   16.13 15.35 10.29   ~ 826 3
39 4C 18.45 QSO 15 49 36.6036 +18 35 00.602   20.47 20.13     ~ 22 1
40 3C 324.0 Sy1 15 49 49.170 +21 25 39.50   21.5       ~ 312 1
41 PKS 1621-11 rG 16 23 59.5609 -11 40 43.722           ~ 26 1
42 [MMS2019] NVSS J162706-091705a Rad 16 27 04.530 -09 16 55.99           ~ 2 0
43 NVSS J162706-091705 Rad 16 27 06.719 -09 17 04.68           ~ 5 1
44 [MMS2019] NVSS J162706-091705b Rad 16 27 06.780 -09 17 06.50           ~ 2 0
45 LBN 006.00+24.73 HII 16 35 56.8 -12 43 05           ~ 76 0
46 [MMS2019] NVSS J163927-124139a Rad 16 39 27.090 -12 41 26.41           ~ 2 0
47 PMN J1639-1241 Rad 16 39 27.586 -12 41 44.50           ~ 4 1
48 [MMS2019] NVSS J163927-124139b Rad 16 39 28.200 -12 42 09.07           ~ 2 0
49 ICRF J170934.3-172853 QSO 17 09 34.34539302 -17 28 53.3650596     17.5 20.90   ~ 50 1
50 4C -00.67 Sy2 17 20 28.1680537512 -00 58 46.582453920   15.36       ~ 345 1
51 QSO B1730-130 Bla 17 33 02.70578907 -13 04 49.5482119   18 19.50 18.78 17.39 ~ 1198 1
52 3C 395 Bla 19 02 55.93889653 +31 59 41.7016439     17.5     ~ 281 2
53 ICRF J192417.4+332929 QSO 19 24 17.48046496 +33 29 29.7381957           ~ 17 0
54 LBN 089.56-08.04 HII 21 37.0 +40 13           ~ 5 0
55 LBN 091.00-06.39 HII 21 42.3 +44 32           ~ 9 0
56 NVSS J220205+394913 Rad 22 02 05.168 +39 49 13.64           ~ 5 1
57 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2397 1
58 NVSS J220927+415834 Rad 22 09 27.251 +41 58 34.88           ~ 5 1
59 ZwCl 2207+4114 ClG 22 09.9 +41 29           ~ 4 0
60 LBN 094.98-16.95 HII 22 34 37.9 +40 40 00           ~ 26 0
61 PSZ1 G097.52-14.92 C?G 22 37 30.3560 +41 16 42.216           ~ 9 0
62 RX J2237.9+4101 X 22 37 53.54 +41 01 19.9           ~ 7 1
63 ICRF J224412.7+405713 BLL 22 44 12.7311667056 +40 57 13.619816316       19.7   ~ 110 1
64 3C 452 Sy2 22 45 48.7616172744 +39 41 15.906782184   17.60 16.56     ~ 391 1
65 4C 13.88 Rad 23 40 33.194 +13 33 00.50           ~ 22 1
66 4C 22.65 Rad 23 57 28.481 +23 02 26.33           ~ 7 1

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