2001ApJ...556..113H

Query : 2001ApJ...556..113H

2001ApJ...556..113H - Astrophys. J., 556, 113-120 (2001/July-3)

Parsec-scale circular polarization observations of 40 blazars.

HOMAN D.C., ATTRIDGE J.M. and WARDLE J.F.C.

Abstract (from CDS):

We present circular polarization results from a 5 GHz survey of the parsec-scale polarization properties of 40 active galactic nuclei (AGNs) made with the VLBA. We find 11 circular polarization detections at the 3 σ level or higher. This nearly quadruples the number of sources detected in circular polarization at VLBI resolution. We find no correlation between fractional linear and circular polarization across our sample. A likely explanation is external Faraday depolarization in the cores of AGNs which reduces linear polarization but leaves circular polarization unchanged. In comparing ours and other recent results to observations made ∼20 years ago, we find that, in five of six cases, sources have the same sign of circular polarization today as they did 20 years ago. This suggests the presence of a long-term property of the jets, such as the polarity of a net magnetic flux, which is stable on timescales much longer than those of individual outbursts.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Active - Galaxies: Jets - Polarization

CDS comments: Table 1 : 0422-004 misprint for 0422+004

Simbad objects: 46

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Number of rows : 46
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 QSO J0217+0144 QSO 02 17 48.95475095 +01 44 49.6990271   16.74 16.09 18.51 13.29 ~ 426 1
2 QSO B0219-1628 QSO 02 22 00.72502859 -16 15 16.5480927   15.38 15.00 18.14   ~ 110 1
3 3C 66A BLL 02 22 39.6114771888 +43 02 07.799534304   15.71 15.21 14.5   ~ 889 1
4 3C 84 Sy2 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4017 3
5 QSO B0336-0156 QSO 03 39 30.93778633 -01 46 35.8041892   18.96 18.41 17.33   ~ 559 1
6 QSO B0403-132A BLL 04 05 34.00339116 -13 08 13.6909309   17.37 17.09 16.6   ~ 360 1
7 QSO B0420-0127 QSO 04 23 15.80072217 -01 20 33.0656073   17.50 17.00 16.28   ~ 1210 3
8 QSO B0422+004 BLL 04 24 46.8421990080 +00 36 06.329375028 16.15 15.94 16.98     ~ 359 1
9 QSO J0457-2324 QSO 04 57 03.1791422424 -23 24 52.021129572   18.85 18.5 16.56   ~ 397 1
10 QSO B0537-441 BLL 05 38 50.36155950 -44 05 08.9390233   15.77 16.48 16   ~ 885 2
11 QSO B0605-0834 BLL 06 07 59.69924014 -08 34 49.9783246     17.60 17.70   ~ 462 1
12 QSO B0607-157 QSO 06 09 40.94954062 -15 42 40.6727537   18.47 18.00 19.90   ~ 315 1
13 4C -00.28 QSO 07 45 54.08232685 -00 44 17.5399048   18 17.1 16.69   ~ 193 1
14 ICRF J084957.9+510829 Sy1 08 49 57.97685916 +51 08 29.0238146   19.37 18.78 17.79   ~ 250 2
15 QSO J0854+2006 BLL 08 54 48.8749846272 +20 06 30.639583620   15.91 15.43 15.56   ~ 2345 1
16 3C 212 QSO 08 58 41.44702653 +14 09 44.7622845   19.96 19.06     ~ 253 1
17 ICRF J090910.0+012135 Sy1 09 09 10.09159883 +01 21 35.6176206   17.63 17.29 17.04   ~ 428 2
18 ICRF J090933.4+425346 Sy2 09 09 33.49714902 +42 53 46.4821036   19.98 19.42 18.220   ~ 504 0
19 ICRF J105829.6+013358 Sy1 10 58 29.60520810 +01 33 58.8237454   18.74 18.28 16.68   ~ 781 2
20 LB 2136 Sy1 11 53 24.46663994 +49 31 08.8301372   17.94 17.66     ~ 501 1
21 Ton 599 Sy1 11 59 31.83391383 +29 14 43.8268224   14.80 14.41 17.652 13.39 ~ 928 1
22 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5813 1
23 3C 279 Bla 12 56 11.16657958 -05 47 21.5251510   18.01 17.75 15.87   ~ 3057 2
24 QSO B1334-127 Bla 13 37 39.78278132 -12 57 24.6933925   18.5 19.00 16.22   ~ 505 1
25 Mrk 668 Sy1 14 07 00.39441712 +28 27 14.6901341   16.13 15.35 10.29   ~ 775 2
26 ICRF J141558.8+132023 Sy2 14 15 58.81751033 +13 20 23.7128587   21.055 20.000 18.461   ~ 441 1
27 QSO B1502+1041 Bla 15 04 24.97978391 +10 29 39.1985309   18.97 18.56 18.94   ~ 578 1
28 QSO B1504-167 QSO 15 07 04.78696269 -16 52 30.2671543   18.40 18.50 17.00   ~ 230 1
29 QSO J1512-0906 Bla 15 12 50.53293048 -09 05 59.8297908   16.74 16.54     ~ 1320 1
30 QSO B1519-273 BLL 15 22 37.67599511 -27 30 10.7855131   18.72 18.5 17.42   ~ 295 1
31 QSO B1546+0246 Bla 15 49 29.43684740 +02 37 01.1632556   17.57 17.42 15.53   ~ 365 1
32 QSO J1658+0515 QSO 16 58 33.4471896264 +05 15 16.442476596   17.00 16.54 16.21   ~ 227 1
33 8C 1842+681 BLL 18 42 33.64168679 +68 09 25.2277637     17.9 18.01   ~ 137 1
34 SS 433 HXB 19 11 49.5647697480 +04 58 57.827127648   16.854 14.643     A3/7I 2126 4
35 QSO B1921-293 BLL 19 24 51.05595254 -29 14 30.1210248   18.71 18.21 15.07   ~ 873 0
36 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1236 1
37 QSO B1958-179 QSO 20 00 57.09043927 -17 48 57.6726139   18.02 18.60 15.33   ~ 268 1
38 QSO B2032+107 BLL 20 35 22.33330500 +10 56 06.7881888   17.96 16.37 17.4   ~ 198 1
39 QSO B2201+1711 BLL 22 03 26.89368237 +17 25 48.2477620     19.50 14.76   ~ 205 1
40 3C 446 BLL 22 25 47.25929101 -04 57 01.3907626   18.83 18.39 16.3   ~ 831 1
41 QSO B2227-0848 Bla 22 29 40.08433313 -08 32 54.4355294   17.80 17.41 17.81   ~ 361 1
42 4C 11.69 Bla 22 32 36.40890093 +11 43 50.9040592   17.75 17.33     ~ 1123 2
43 QSO B2232+282 BLL 22 36 22.47084387 +28 28 57.4132050   19.1 19.0 17.60   ~ 272 1
44 QSO J2246-1206 QSO 22 46 18.23197022 -12 06 51.2775983   16.63 16.45 15.99   ~ 283 1
45 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2856 2
46 QSO B2345-167 QSO 23 48 02.60851466 -16 31 12.0222546   18.00 18.41 16.86   ~ 406 1

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