2009A&A...502...61M


Query : 2009A&A...502...61M

2009A&A...502...61M - Astronomy and Astrophysics, volume 502, 61-65 (2009/7-4)

Effelsberg 100-m polarimetric observations of a sample of compact steep-spectrum sources.

MANTOVANI F., MACK K.-H., MONTENEGRO-MONTES F.M., ROSSETTI A. and KRAUS A.

Abstract (from CDS):

We completed observations with the Effelsberg 100-m radio telescope to measure the polarised emission from a complete sample of compact steep-spectrum sources and improve our understanding of the physical conditions inside and around regions of radio emission embedded in dense interstellar environments. We observed the sources at four different frequencies, namely 2.64GHz, 4.85GHz, 8.35GHz, and 10.45GHz, making use of the polarimeters available at the Effelsberg telescope. We complemented these measurements with polarisation parameters at 1.4GHz derived from the NRAO VLA Sky Survey. Previous single dish measurements were taken from the catalogue of Tabara and Inoue. The depolarisation index DP was computed for four pairs of frequencies. A drop in the fractional polarisation appeared in the radio emission when observing at frequencies below ∼2GHz. Rotation measures were derived for about 25% of the sources in the sample. The values, in the source rest frame, range from about -20rad/m2 found for 3C 138 to 3900rad/m2 in 3C 119. In all cases, the λ2 law is closely followed. The presence of a foreground screen as predicted by the Tribble model or with ``partial coverage'' as defined by ourselves can explain the polarimetric behaviour of the CSS sources detected in polarisation by the present observations. Indication of repolarisation at lower frequencies was found for some sources. A case of possible variability in the fractional polarisation is also suggested. The most unexpected result was found for the distribution of the fractional polarisations versus the linear sizes of the sources. Our results appear to disagree with the findings of Cotton and collaborators and Fanti and collaborators for the B3-VLA sample of CSS sources, the so-called ``Cotton effect'', i.e., a strong drop in polarised intensity for the most compact sources below a given frequency. This apparent contradiction may, however, be caused by the large contamination of the sample by quasars with respect to the B3-VLA.

Abstract Copyright:

Journal keyword(s): radio continuum: general - radio continuum: ISM - polarization

Simbad objects: 51

goto Full paper

goto View the references in ADS

Number of rows : 51
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 3C 43 QSO 01 29 59.7696120312 +23 38 20.041393524           ~ 196 0
2 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2717 2
3 3C 49 rG 01 41 09.10 +13 53 28.0   22.327 20.920 20.876   ~ 180 1
4 7C 022118.10+273638.00 Sy1 02 24 12.2865158736 +27 50 11.538285648   19.502 18 18.263   ~ 205 1
5 4C 34.07 QSO 02 26 10.33325265 +34 21 30.2874853   21.3       ~ 91 1
6 ICRF J031857.8+162832 AGN 03 18 57.80304294 +16 28 32.6782325     22.0     ~ 198 1
7 QSO B0319+12 QSO 03 21 53.10350560 +12 21 13.9537765   19 19     ~ 126 1
8 3C 93.1 BLL 03 48 46.9073426592 +33 53 15.461439576   20.723   19.110   ~ 128 1
9 ICRF J041045.6+765645 AGN 04 10 45.61079426 +76 56 45.3130641   21 22.0 21.200   ~ 155 1
10 PKS 0428+205 rG 04 31 03.76141386 +20 37 34.2648470   22.174   19.085   ~ 180 1
11 2C 396 QSO 04 32 36.50262174 +41 38 28.4497778     20.0     ~ 214 1
12 ICRF J052109.8+163822 Sy1 05 21 09.88596258 +16 38 22.0515459   19.37 18.84 18.480   ~ 818 1
13 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1422 1
14 3C 186 QSO 07 44 17.4720658920 +37 53 17.250697320   17.5 18.14 17.2   ~ 307 1
15 3C 190 QSO 08 01 33.5525166480 +14 14 42.813906612   21.07 20.26 18.972   ~ 231 2
16 ICRF J090933.4+425346 Sy2 09 09 33.49714902 +42 53 46.4821036   19.98 19.42 18.220   ~ 486 0
17 3C 237.0 rG 10 08 00.0529 +07 30 16.830   21       ~ 186 0
18 3C 241 rG 10 21 54.59 +21 59 31.2   23.5       ~ 164 0
19 4C 31.38 Sy2 11 56 18.7420683840 +31 28 04.676598588   19.33 18.96     ~ 134 1
20 QSO B1157+014 QSO 11 59 44.8278142392 +01 12 06.985999764   17.87 17.52     ~ 215 1
21 3C 268.3 Sy1 12 06 24.70656 +64 13 36.8760   21.847 20.790 19.910   ~ 185 1
22 QSO B1225+368 QSO 12 27 58.72552577 +36 35 11.8265176   21.5 21.5     ~ 126 0
23 2E 2879 Sy1 12 52 26.3561235816 +56 34 19.573734864   18.42 18.11 17.660   ~ 283 2
24 4C 32.44 QSO 13 26 16.51228213 +31 54 09.5149249   21.367 19.822 18.882   ~ 164 1
25 3C 287 QSO 13 30 37.6960744824 +25 09 10.983105972   18.31 17.67     ~ 347 1
26 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4170 2
27 ICRF J140028.6+621038 Sy2 14 00 28.64823540 +62 10 38.5885744   22.137 20.373 19.530   ~ 170 1
28 3C 295 Sy2 14 11 20.467 +52 12 09.52   22.34 20.80 18.54   ~ 955 5
29 NVSS J141604+344436 Rad 14 16 04.18619489 +34 44 36.4264542           ~ 92 1
30 3C 298.0 QSO 14 19 08.1802187928 +06 28 34.802854680   17.12 16.79     ~ 396 1
31 3C 299 rG 14 21 05.6960 +41 44 49.260   20.496 19.330 18.560   ~ 180 1
32 8C 1443+773 Sy2 14 43 14.0 +77 07 28   19   18.730   ~ 144 1
33 QSO B1445+101 QSO 14 45 16.46525080 +09 58 36.0727447   18.58 17.78     ~ 388 1
34 3C 305.1 rG 14 47 09.5 +76 56 22   21.37       ~ 93 1
35 ICRF J145907.5+714019 Sy1 14 59 07.58390804 +71 40 19.8668093   17.24 16.78 17.2   ~ 479 1
36 3C 318.0 QSO 15 20 05.4773966208 +20 16 05.471959692   21.93 20.9     ~ 187 1
37 4C 33.38 Bla 16 02 07.26346417 +33 26 53.0723251     23.0 23   ~ 128 1
38 4C 10.45 QSO 16 08 46.20318700 +10 29 07.7757424   18.5 18.0 18.03   ~ 363 1
39 ICRF J163433.8+624535 Sy2 16 34 33.80623119 +62 45 35.8960467   21.06 20.61     ~ 212 1
40 ICRF J163828.2+623444 Sy2 16 38 28.22535940 +62 34 44.3168151   20.7 20.7     ~ 160 2
41 3C 346.0 BLL 16 43 48.605 +17 15 49.43   17.2       ~ 257 0
42 4C 39.56 Sy1 18 21 20.8979332560 +39 42 44.862056676   19.598   18.135   ~ 62 1
43 ICRF J182931.7+484446 Sy1 18 29 31.7809732968 +48 44 46.160168892   17.05 16.81 16.860   ~ 667 1
44 ICRF J183114.8+290710 Sy2 18 31 14.85954059 +29 07 10.2942036   21.917 20.2 20.200   ~ 71 1
45 NAME Cyg A Sy2 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2279 2
46 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2416 1
47 4C 11.69 QSO 22 32 36.40890093 +11 43 50.9040592   17.75 17.33     ~ 1064 2
48 3C 454.1 rG 22 50 32.90 +71 29 19.0   22       ~ 76 1
49 BWE 2249+1832 QSO 22 51 34.7277468096 +18 48 40.087264428   18.52 18.4     ~ 220 2
50 3C 455.0 Sy2 22 55 03.9 +13 13 35   19.535 19.590 19.190   ~ 190 2
51 ICRF J234403.7+822640 Sy2 23 44 03.8302221504 +82 26 40.345410408   21.769 20.5 20.220   ~ 94 1

To bookmark this query, right click on this link: simbad:objects in 2009A&A...502...61M and select 'bookmark this link' or equivalent in the popup menu


2023.01.27-13:03:44

© Université de Strasbourg/CNRS

    • Contact