2000A&AS..145..121P


Query : 2000A&AS..145..121P

2000A&AS..145..121P - Astron. Astrophys., Suppl. Ser., 145, 121-159 (2000/July-0)

VLA radio continuum observations of a new sample of high redshift radio galaxies.

PENTERICCI L., VAN REEVEN W., CARILLI C.L., ROETTGERING H.J.A. and MILEY G.K.

Abstract (from CDS):

We present new deep multi-frequency radio-polarimetric images of a sample of high redshift radio galaxies (HzRGs), having redshift between 1.7 and 4.1. The radio data at 4.7 and 8.2 GHz were taken with the Very Large Array in the A configuration and provide a highest angular resolution of 0.2''. Maps of total intensity, radio spectral index, radio polarization and internal magnetic field are presented for each source. The morphology of most objects is that of standard FRII double radio sources, but several contain multiple hot-spots in one or both lobes. Compared to similar samples of HzRGs previously imaged, there is a higher fraction (29%) of compact steep spectrum sources (i.e. sources with a projected linear size less than 20kpc). Radio cores are identified in about half of the sample and tend to have relatively steep spectra (α≤-1). Polarization is detected in all but 4 sources, with typical polarization at 8.2GHz of around 10-20%. The Faraday rotation can be measured in most of the radio galaxies: the observed rotation measure (RM) of 8 radio sources exceeds 100rad/m2 in at least one of the lobes, with large gradients between the two lobes. We find no dependence of Faraday rotation with other properties of the radio sources. If the origin of the Faraday rotation is local to the sources, as we believe, then the intrinsic RM is more than a 1000rad/m2. Because low redshift radio galaxies residing at the center of clusters usually show extreme RMs, we suggest that the high-z large RM sources also lie in very dense environments. Finally, we find that the fraction of powerful radio galaxies with extreme Faraday rotation increases with redshift, as would be expected if their average environment tends to become denser with decreasing cosmic epoch. However this result has to be taken with caution, given the limitations of our analysis.

Abstract Copyright:

Journal keyword(s): galaxies: active - nuclei - radio continuum: galaxies

CDS comments: Calibrator 1745+173 not identified. Table 1: Source 1339+35 (catalogue FW?) not identified.

Simbad objects: 30

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Number of rows : 30
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 PKS 0011-023 rG 00 14 25.5463 -02 05 55.875           ~ 13 1
2 MRC 0152-209 rG 01 54 55.70 -20 40 26.0           ~ 30 2
3 4C 41.17 rG 06 50 52.098 +41 30 30.53           ~ 319 1
4 NVSS J093306+384150 rG 09 33 06.9 +38 41 48           ~ 31 1
5 4C 05.41 rG 10 19 33.4 +05 34 35   20.0       ~ 44 1
6 PKS J1019-2220 rG 10 19 49.00 -22 19 58.0           ~ 26 1
7 4C 34.32 rG 10 34 35.9 +33 49 11           ~ 19 1
8 NVSS J104236+675023 rG 10 42 37.00 +67 50 23.0           ~ 7 1
9 NVSS J105911+392504 rG 10 59 11.4 +39 25 07           ~ 21 1
10 NVSS J113505+370840 rG 11 35 05.9 +37 08 41           ~ 17 1
11 6C 1134+3656 QSO 11 37 07.3 +36 39 57   21.4       ~ 14 1
12 NAME Spiderweb Galaxy AGN 11 40 48.3 -26 29 09     22.00     ~ 256 1
13 7C 120204.40+524523.00 QSO 12 04 36.8000793459 +52 28 41.770814218   18.69 18.48     ~ 37 1
14 4C 40.30 rG 12 07 06.2639 +39 54 39.369           ~ 19 1
15 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3916 2
16 [DBC2004] M03 rG 13 38 26.05 -19 42 30.5       22.4   ~ 91 0
17 PKS 1357+007 rG 14 00 21.3 +00 30 21           ~ 6 1
18 PKS 1425-148 rG 14 28 42.8 -15 02 29           ~ 4 0
19 4C -00.62 rG 16 01 17.5 -00 28 47           ~ 62 1
20 PMN J1650+0955 rG 16 50 05.10 +09 55 08.0           ~ 12 1
21 3C 362 rG 17 47 07.0 +18 21 10     19.0     ~ 22 1
22 NAME TX J1908+7220 rG 19 08 23.50 +72 20 09.8           ~ 53 1
23 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2189 2
24 4C 02.51 rG 20 36 34.8 +02 56 54           ~ 14 1
25 PMN J2051-2702 rG 20 51 03.6 -27 03 03           ~ 33 1
26 PMN J2055-2510 rG 20 55 01.8 -25 09 48           ~ 11 1
27 LEDA 2830749 rG 21 06 58.16 -24 05 11.3   23.0       ~ 71 1
28 [VV2000] J221404.3-245644 QSO 22 14 04.3524660380 -24 56 44.208496704     20.00     ~ 14 1
29 NVSS J222743-270501 rG 22 27 43.2 -27 05 02           ~ 27 1
30 NVSS J232142+223752 rG 23 21 42.20 +22 37 52.0           ~ 6 1

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2021.09.28-18:24:13

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