1999MNRAS.302L..60S


Query : 1999MNRAS.302L..60S

1999MNRAS.302L..60S - Mon. Not. R. Astron. Soc., 302, L60-L64 (1999/February-1)

Polarization of radio cores as a test of unified schemes.

SAIKIA D.J.

Abstract (from CDS):

In unified schemes for extragalactic radio sources, quasars and BL Lac objects are intrinsically similar to Fanaroff–Riley class II and I radio galaxies respectively, but appear to be different because they are viewed at different angles to the line of sight. Quasars and BL Lac objects are observed at small viewing angles, while radio galaxies lie close to the plane of the sky. In such schemes, a quasar or BL Lac nucleus is hidden from our view by a putative torus when the source is inclined at a large angle to the line of sight, and it then appears as a radio galaxy. Such a scenario should also affect the observed polarization properties of cores, with the cores in radio galaxies and weak-cored quasars being less polarized than those of core-dominated quasars and BL Lacs because of Faraday depolarization by the magnetoionic medium in the obscuring torus or disc. In this paper, we report that the core polarization of radio galaxies and weak-cored quasars is indeed much smaller than for core-dominated quasars and BL Lacs. We suggest that this is a result of the depolarization caused by the obscuring torus or disc, providing further evidence in favour of unified schemes.

Abstract Copyright: 1999, Royal Astronomical Society

Journal keyword(s): polarization - galaxies: active - BL Lacertae objects: general - galaxies: nuclei - quasars: general - radio continuum: galaxies

Simbad objects: 72

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Number of rows : 72
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 3C 20 Sy2 00 43 09.6 +52 03 35   19.0       ~ 205 0
2 QSO B0048-09 BLL 00 50 41.31738756 -09 29 05.2102688 16.74 16.39 16.22 16.14   ~ 434 2
3 NGC 315 LIN 00 57 48.88335 +30 21 08.8122 12.80 12.20 11.16 11.26   ~ 732 2
4 NGC 383 rG 01 07 24.95870 +32 24 45.2140   13.6 12.14     ~ 742 3
5 QSO B0109+224 BLL 01 12 05.8246825085 +22 44 38.786096536   16.00 15.66 15.47   ~ 312 2
6 4C 31.04 rG 01 19 35.0033970 +32 10 50.058043   16 14.5     ~ 223 1
7 QSO B0118-272 BLL 01 20 31.6632705443 -27 01 24.643168036   15.89 15.56 15.49   ~ 251 1
8 QSO B0138-097 BLL 01 41 25.83215547 -09 28 43.6741894   16.94 16.55 17.21   ~ 252 3
9 UGC 1841 Sy1 02 23 11.41124 +42 59 31.3840   15.71 14.81     ~ 541 2
10 QSO B0235+1624 BLL 02 38 38.93010 +16 36 59.2746   16.46 15.50 15.92   ~ 1442 2
11 NGC 1218 Sy1 03 08 26.2238190 +04 06 39.300921   12.84       ~ 355 1
12 3C 79.0 Sy2 03 10 00.096140 +17 05 58.61497   19.54 18.75     ~ 248 3
13 NGC 1265 GiC 03 18 15.674 +41 51 27.94   14.7       ~ 352 2
14 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3721 3
15 Z 541-15 rG 03 29 23.893 +39 47 31.89   14.9       ~ 92 0
16 QSO B0338-214 BLL 03 40 35.60786053 -21 19 31.1720263   16.04 17.1 17.07   ~ 156 1
17 QSO B0406+121 BLL 04 09 22.00871268 +12 17 39.8477204   20.5   18.27   ~ 102 1
18 3C 111 Sy1 04 18 21.2773655604 +38 01 35.801523843   19.75 18.05     ~ 885 1
19 QSO B0422+004 BLL 04 24 46.8423020674 +00 36 06.327828096 16.15 15.94 16.98     ~ 337 1
20 Mrk 1506 Sy1 04 33 11.0958197353 +05 21 15.617543663   15.72 15.05 10.08   ~ 1898 2
21 3C 132 rG 04 56 42.922 +22 49 23.06   18.5       ~ 144 1
22 QSO B0454+844 BLL 05 08 42.36345199 +84 32 04.5440155     16.5 18.95   ~ 235 1
23 2MASX J05160313+2458254 AGN 05 16 03.133 +24 58 25.47   17       ~ 85 1
24 QSO B0537-441 BLL 05 38 50.36155219 -44 05 08.9389165   15.77 16.48 16   ~ 822 2
25 3C 171.0 Sy2 06 55 14.7 +54 08 59   19.94 19.08     ~ 245 0
26 8C 0716+714 BLL 07 21 53.4484901266 +71 20 36.362058601   15.5 14.17 14.27   ~ 1185 1
27 QSO J0738+1742 BLL 07 38 07.39374766 +17 42 18.9982302   16.76 16.22 15.78   ~ 915 1
28 7C 073432.79+803253.00 Sy1 07 43 01.4 +80 26 26     17.0     ~ 174 1
29 QSO B0808+019 BLL 08 11 26.70731189 +01 46 52.2202616   17.58 17.2 17.96   ~ 214 1
30 7C 081451.89+423206.00 BLL 08 18 15.99960470 +42 22 45.4149140   18.88 18.18 17.81   ~ 369 1
31 3C 197.1 BLL 08 21 33.6009413715 +47 02 37.299966417   18.08 17.33     ~ 133 1
32 QSO B0823+033 BLL 08 25 50.33835429 +03 09 24.5200730   17.81 17.23 16.91   ~ 304 1
33 QSO B0823-223 BLL 08 26 01.57293454 -22 30 27.2032544   16.11 16.20     ~ 191 1
34 6C 082850+492334 BLL 08 32 23.21671411 +49 13 21.0382485   20.17 19.63     ~ 157 1
35 QSO J0854+2006 BLL 08 54 48.8749311881 +20 06 30.642936668   15.91 15.43 15.56   ~ 2131 1
36 3C 219 Sy1 09 21 08.6263828902 +45 38 57.345842278   19.56 18.69     ~ 395 2
37 7C 093818.10+395820.00 Sy2 09 41 24.0272828657 +39 44 41.806341013   16.36 16.4     ~ 181 2
38 ATO J146.9381+07.4223 Sy1 09 47 45.1435259633 +07 25 20.596199631   17.37 16.95     ~ 348 0
39 6C 095456+654857 BLL 09 58 47.2452838930 +65 33 54.821524491     17.0 15.75   ~ 646 1
40 QSO B1144-3755 BLL 11 47 01.37070177 -38 12 11.0234199   19.03 16.2 16.72   ~ 274 1
41 7C 1147+2434 BLL 11 50 19.2119754161 +24 17 53.834754764   16.26 15.74 15.80   ~ 257 1
42 7C 1219+2830 BLL 12 21 31.6902446544 +28 13 58.500383827   16.81 16.11 14.24   ~ 805 1
43 8C 1221+809 BLL 12 23 40.49373854 +80 40 04.3404390     19.0 19.3   ~ 98 1
44 2MASX J13110466+2728070 Sy2 13 11 04.670 +27 28 07.24   18.93 18.00     ~ 191 1
45 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4172 3
46 QSO B1413+135 BLL 14 15 58.81750938 +13 20 23.7129069   21.055 20.000 18.461   ~ 397 1
47 6C 141804+543700 BLL 14 19 46.5976435439 +54 23 14.787308481   16.17 15.65 14.16   ~ 557 1
48 QSO B1514-24 BLL 15 17 41.8135246339 -24 22 19.482167214   15.13 14.00 13.95   ~ 689 3
49 QSO B1519-273 BLL 15 22 37.67598872 -27 30 10.7854174   18.72 18.5 17.42   ~ 270 1
50 4C 14.60 BLL 15 40 49.49151734 +14 47 45.8848470   17.72 17.30 17.240   ~ 391 1
51 NGC 6251 Sy2 16 32 31.96990024 +82 32 16.3999540 15.24 14.66 12.89 7.62   ~ 687 0
52 3C 351.0 Sy1 17 04 41.3742389551 +60 44 30.522600868   15.65 15.40 15.30   ~ 731 1
53 QSO B1717+178 BLL 17 19 13.0484094263 +17 45 06.437888139   20.10 19.1 17.28   ~ 201 1
54 7C 1749+7006 BLL 17 48 32.8399653579 +70 05 50.768853537   17.46 17.01 15.48   ~ 397 1
55 8C 1803+784 BLL 18 00 45.6831135718 +78 28 04.017792333   16.4 16.4 15.46   ~ 683 1
56 3C 371 BLL 18 06 50.6803567107 +69 49 28.108152993   14.77 14.22 11.39   ~ 814 2
57 4C 56.27 BLL 18 24 07.06837771 +56 51 01.4908371   18.9 18.4 16.48   ~ 452 1
58 2MASX J18334627+4727027 Sy1 18 33 46.2946109378 +47 27 02.568353862   18.64 17.24     ~ 196 1
59 ICRF J183503.3+324146 Sy1 18 35 03.3896681512 +32 41 46.856048508   16.50 15.39 10.50   ~ 603 1
60 ICRF J184208.9+794617 Sy1 18 42 08.9910523393 +79 46 17.129210139   16.06 15.38     ~ 1248 0
61 3C 388.0 SyG 18 44 02.417 +45 33 29.81   16.91 15.56     ~ 313 1
62 QSO B1921-293 BLL 19 24 51.05595514 -29 14 30.1210524   18.71 18.21 15.07   ~ 747 0
63 3C 401 SyG 19 40 25.2 +60 41 34   19.1       ~ 196 1
64 8C 2007+777 BLL 20 05 30.9981060951 +77 52 43.245329882     16.5 17.36   ~ 417 1
65 4C 72.28 BLL 20 09 52.3045342424 +72 29 19.346280867   19.0   19.40   ~ 94 1
66 3C 424 BLL 20 48 12.030 +07 01 17.48   18 18.40     ~ 138 1
67 2MASX J21234458+2504272 Sy2 21 23 44.582 +25 04 27.23   17.660 16.350     ~ 308 0
68 4C -02.81 BLL 21 34 10.30959643 -01 53 17.2387909   18.6 19.0 18.87   ~ 340 1
69 QSO B2150+173 BLL 21 52 24.81939953 +17 34 37.7950583     17.9 17.98   ~ 138 2
70 2MASX J21555232+3800285 SyG 21 55 52.324 +38 00 28.51   19.20       ~ 219 1
71 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 2091 1
72 QSO B2254+0727 BLL 22 57 17.30312249 +07 43 12.3024770   17.07 16.36     ~ 291 1

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2022.01.20-05:02:55

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