2008A&A...489...69B

Query : 2008A&A...489...69B

2008A&A...489...69B - Astronomy and Astrophysics, volume 489, 69-83 (2008/10-1)

Deep Westerbork observations of Abell 2256 at 350 MHz.

BRENTJENS M.A.

Abstract (from CDS):

Deep polarimetric Westerbork observations of the galaxy cluster Abell 2256 are presented, covering a frequency range of 325-377MHz. The central halo source has a diameter of the order of 1.2Mpc (18'), which is somewhat larger than at 1.4GHz. With α=-1.61±0.04, the halo spectrum between 1.4GHz and 22.25MHz is less steep than previously thought. The centre of the ultra steep spectrum source in the eastern part of the cluster exhibits a spectral break near 400MHz. It is estimated to be at least 51 million years old, but possibly older than 125 million years. A final measurement requires observations in the 10-150MHz range. It remains uncertain whether the source is a radio tail of Fabricant galaxy 122, situated in the northeastern tip of the source. Faraday rotation measure synthesis revealed no polarized flux at all in the cluster. The polarization fraction of the brightest parts of the relic area is less than 1%. The RM-synthesis nevertheless revealed 9 polarized sources in the field enabling an accurate measurement of the Galactic Faraday rotation (-33±2rad/m2 in front of the relic). Based on its depolarization on longer wavelengths, the line-of-sight magnetic field in relic filament G is estimated to be between 0.02 and 2µG. A value of 0.2µG appears most reasonable given the currently available data.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: individual: Abell 2256 - magnetic fields - polarization - radio continuum: general

Nomenclature: Fig.11, Table 3: [B2008] NN (Nos 1-11).

Simbad objects: 59

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Number of rows : 59
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 NAME NCP reg 00 00 00 +90 00.0           ~ 186 0
2 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 909 0
3 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2815 2
4 NAME PER SUPERCL SCG 02 33.2 +41 37           ~ 413 1
5 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 2259 1
6 4C 56.16 rG 07 49 48.1 +55 54 19           ~ 172 1
7 NAME 0917+75 Relic rG 09 22 11.400 +74 59 31.00           ~ 15 0
8 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4341 2
9 NGC 5419 BiC 14 03 38.7225244848 -33 58 41.881842120   11.77 11.33 10.21 14.44 ~ 198 2
10 3C 295 Sy2 14 11 20.6 +52 12 09   22.34 20.80 18.54   ~ 979 5
11 [B2008] 1 Rad 16 47 02.7 +79 06 16           ~ 1 0
12 NVSS J164706+790618 Rad 16 47 06.4 +79 06 18           ~ 4 1
13 [B2008] 2 Rad 16 49 07.7 +78 51 02           ~ 1 0
14 [B2008] 3 Rad 16 51 45.1 +78 09 33           ~ 1 0
15 2MASX J16575851+7836144 GiC 16 57 58.3121144088 +78 36 14.267423952   17.10       ~ 10 0
16 [RSM94] AD ClG 16 58 18.3 +78 29 34           ~ 4 0
17 [RSM94] R Rad 16 58 49.2 +78 37 21           ~ 3 0
18 [RSM94] S Rad 16 59 26.6 +78 41 15           ~ 5 0
19 [RSM94] V Rad 17 00 20.1 +78 28 06           ~ 3 0
20 [B2008] 4 Rad 17 00 30.7 +79 30 47           ~ 1 0
21 2MASX J17005206+7841214 GiC 17 00 52.2251220528 +78 41 21.123626136   16.78       ~ 24 0
22 [B2008] 5 Rad 17 00 53.6 +79 30 32           ~ 1 0
23 [RSM94] P Rad 17 01 04.0 +78 30 05           ~ 4 0
24 [RSM94] N Rad 17 01 18.0 +79 00 00           ~ 3 0
25 [RSM94] F1 Rad 17 02 18.08 +78 41 28.5           ~ 9 0
26 [BF76] H Rad 17 02 31.5 +78 42 37           ~ 11 0
27 [RSM94] AC ClG 17 02 46.5 +78 51 46           ~ 4 0
28 [BF76] L Rad 17 02 50.5 +78 31 49           ~ 4 0
29 2MASX J17030269+7835549 GiC 17 03 02.7991076016 +78 35 55.241646576           ~ 34 0
30 ACO 2256 ClG 17 03 09.4 +78 39 36           ~ 885 1
31 [RSM94] Q Rad 17 03 22.4 +78 25 06           ~ 3 0
32 NVSS J170327+785810 Rad 17 03 27.21 +78 58 10.7           ~ 4 0
33 LEDA 59513 GiC 17 03 29.3857127040 +78 37 54.951103560   17.02       ~ 28 0
34 2MASX J17033002+7839536 GiC 17 03 30.0542270136 +78 39 54.244656504   17.57       ~ 33 0
35 [BF76] G Rad 17 03 43.2 +78 50 04           ~ 13 0
36 [RSM94] AB Rad 17 04 04.3 +78 23 30           ~ 3 0
37 MCG+13-12-019 GiC 17 04 48.1038532800 +78 38 29.215836384   17       ~ 27 0
38 [RSM94] O Rad 17 05 14.5 +78 30 18           ~ 4 0
39 [B2008] 6 Rad 17 05 18.4 +77 47 21           ~ 1 0
40 2MASX J17053342+7851168 GiC 17 05 33.6376252704 +78 51 16.680593736           ~ 11 0
41 [B2008] 7 Rad 17 05 55.5 +77 06 30           ~ 1 0
42 [B2008] 8 Rad 17 06 14.4 +77 07 47           ~ 1 0
43 [BF76] F Rad 17 06 14.4 +78 39 04           ~ 9 0
44 [RSM94] F2 Rad 17 06 14.68 +78 39 41.2           ~ 9 0
45 2MASX J17065622+7841096 GiC 17 06 56.2476607032 +78 41 09.149593164   17.69       ~ 16 0
46 [B2008] 9 Rad 17 07 17.0 +78 06 31           ~ 1 0
47 [RSM94] X Rad 17 07 28.4 +78 47 23           ~ 3 0
48 2MASX J17083328+7829544 GiC 17 08 33.3960445152 +78 29 54.148061580   17.49       ~ 8 0
49 [RSM94] AE ClG 17 09 00.5 +78 46 17           ~ 4 0
50 [RSM94] U Rad 17 09 15.4 +78 28 17           ~ 3 0
51 [RSM94] Y Rad 17 09 18.7 +78 29 03           ~ 3 0
52 [BF76] M Rad 17 09 29.5 +78 41 39           ~ 4 0
53 [RSM94] W Rad 17 09 47.3 +78 51 11           ~ 3 0
54 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 568 0
55 [B2008] 10 Rad 17 18 44.7 +78 39 30           ~ 1 0
56 [B2008] 11 Rad 17 23 34.7 +78 29 18           ~ 1 0
57 PSR B1929+10 Psr 19 32 14.0570 +10 59 33.380           ~ 753 0
58 PSR B1937+21 Psr 19 39 39.6 +21 37 22           ~ 1067 2
59 3C 461 BL? 23 23 24.000 +58 48 54.00     14.30     ~ 2792 1

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