2011A&A...525A.104P

Query : 2011A&A...525A.104P

2011A&A...525A.104P - Astronomy and Astrophysics, volume 525A104-104 (2011/1-1)

Deep multi-frequency rotation measure tomography of the galaxy cluster A 2255.

PIZZO R.F., DE BRUYN A.G., BERNARDI G. and BRENTJENS M.A.

Abstract (from CDS):

By studying the polarimetric properties of the radio galaxies and the radio filaments belonging to the galaxy cluster Abell 2255, we aim to unveil their 3-dimensional location within the cluster.We performed WSRT observations of A 2255 at 18, 21, 25, 85, and 200cm. The polarization images of the cluster were processed through rotation measure (RM) synthesis, producing three final RM cubes.The radio galaxies and the filaments at the edges of the halo are detected in the high-frequency RM cube, obtained by combining the data at 18, 21, and 25cm. Their Faraday spectra show different levels of complexity. The radio galaxies lying near by the cluster center have Faraday spectra with multiple peaks, while those at large distances show only one peak, as do the filaments. Similar RM distributions are observed for the external radio galaxies and for the filaments, with much lower average RM values and RM variance than those found in previous works for the central radio galaxies. The 85 cm RM cube is dominated by the Galactic foreground emission, but it also shows features associated with the cluster. At 2m, no polarized emission from A 2255 nor our Galaxy is detected.The radial trend observed in the RM distributions of the radio galaxies and in the complexity of their Faraday spectra favors the interpretation that the external Faraday screen for all the sources in A 2255 is the ICM. Its differential contribution depends on the amount of medium that the radio signal crosses along the line of sight. The filaments should therefore be located at the periphery of the cluster, and their apparent central location comes from projection effects. Their high fractional polarization and morphology suggest that they are relics rather than part of a genuine radio halo. Their inferred large distance from the cluster center and their geometry could argue for an association with large-scale structure (LSS) shocks.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: Abell 2255 - intergalactic medium - magnetic fields - polarization

Nomenclature: Table 5: [PDB2011] NNA N=37 among (Nos 1-30). Fig. 7: [PDB2011] AN (Nos A1-A2).

CDS comments: Table 5 source 39 is a probable misprint for [PDB2011] 29.

Simbad objects: 58

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Number of rows : 58
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
2 ICRF J052109.8+163822 Sy1 05 21 09.88596258 +16 38 22.0515459   19.37 18.84 18.480   ~ 910 1
3 4C 56.16 rG 07 49 48.077 +55 54 19.45           ~ 176 1
4 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
5 3C 295 Sy1 14 11 20.6 +52 12 09   22.34 20.80 18.54   ~ 1021 4
6 ICRF J160913.3+264129 Sy2 16 09 13.3196 +26 41 29.042   19       ~ 249 1
7 NVSS J165545+644406 Rad 16 55 45.38 +64 44 07.3           ~ 2 1
8 [PDB2011] 2 Rad 16 56 39.0 +63 16 59           ~ 1 0
9 [PDB2011] 3 Rad 16 56 56.0 +63 44 26           ~ 1 0
10 [PDB2011] 4A Rad 16 58 43.0 +62 57 16           ~ 1 0
11 [PDB2011] 4B Rad 16 58 43.0 +62 57 16           ~ 1 0
12 [PDB2011] 5B Rad 16 58 47.0 +62 55 50           ~ 1 0
13 [PDB2011] 5A Rad 16 58 47.0 +62 55 50           ~ 1 0
14 [PDB2011] 6A Rad 17 00 48.0 +63 07 43           ~ 1 0
15 [PDB2011] 6B Rad 17 00 48.0 +63 07 43           ~ 1 0
16 NVSS J170211+650103 Rad 17 02 11.41 +65 01 02.7           ~ 2 1
17 [PDB2011] 8 Rad 17 02 33.0 +62 45 12           ~ 1 0
18 [PDB2011] 28 Rad 17 05 03.0 +64 24 08           ~ 1 0
19 NVSS J170536+632002 Rad 17 05 35.059 +63 20 01.94           ~ 3 1
20 [PDB2011] 27B Rad 17 06 10.0 +64 38 11           ~ 1 0
21 [PDB2011] 27A Rad 17 06 10.0 +64 38 11           ~ 1 0
22 NVSS J170638+623922 rG 17 06 38.75475 +62 39 22.0906           ~ 4 1
23 [PDB2011] 26 Rad 17 08 02.0 +64 04 24           ~ 1 0
24 [PDB2011] 10 Rad 17 08 50.0 +62 27 43           ~ 1 0
25 [PDB2011] 11 Rad 17 09 01.0 +62 25 39           ~ 1 0
26 [PDB2011] 25 Rad 17 10 33.0 +64 30 02           ~ 1 0
27 [GMF2005] F3 Rad 17 12 10.0 +64 03 00           ~ 4 0
28 [GMF2005] F2 Rad 17 12 10.0 +64 08 00           ~ 4 0
29 2MASX J17121627+6402124 rG 17 12 16.2048196872 +64 02 12.380038440           ~ 14 0
30 8C 1712+641 rG 17 12 23.8007008608 +64 02 11.388271056           ~ 19 1
31 [PDB2011] 12 Rad 17 12 38.0 +62 18 22           ~ 1 0
32 [GMF2005] F1 Rad 17 12 40.0 +64 07 00           ~ 4 0
33 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
34 2MASX J17130384+6407014 rG 17 13 03.7806794784 +64 07 01.673867568           ~ 32 0
35 NAME Beaver Galaxy rG 17 13 16.0032670728 +63 47 37.537544544           ~ 37 1
36 7C 1713+6407b LIN 17 13 29.113 +64 02 48.73           ~ 45 2
37 [PDB2011] 23A Rad 17 14 13.0 +65 09 43           ~ 1 0
38 [PDB2011] 23B Rad 17 14 13.0 +65 09 43           ~ 1 0
39 NVSS J171508+640323 rG 17 15 09.0821100936 +64 02 53.508940656           ~ 29 1
40 6C 171514+644245 rG 17 15 30.0400474176 +64 39 51.605504244           ~ 26 1
41 [PDB2011] A2 Rad 17 16 12.6 +64 15 00           ~ 1 0
42 [PDB2011] A1 Rad 17 16 14.0 +64 15 22           ~ 1 0
43 [PDB2011] 20A Rad 17 16 25.0 +65 29 27           ~ 1 0
44 [PDB2011] 20B Rad 17 16 25.0 +65 29 27           ~ 1 0
45 [PDB2011] 15 Rad 17 19 15.0 +63 10 04           ~ 1 0
46 [PDB2011] 22 Rad 17 20 04.0 +65 02 16           ~ 1 0
47 [PDB2011] 21 Rad 17 20 38.0 +65 19 09           ~ 1 0
48 [PDB2011] 16 Rad 17 22 28.0 +63 32 03           ~ 1 0
49 4C 66.19 Rad 17 22 45.152 +66 55 11.96           ~ 6 1
50 [PDB2011] 13 Rad 17 23 14.0 +62 41 29           ~ 1 0
51 [PDB2011] 14 Rad 17 24 02.0 +63 06 16           ~ 1 0
52 [PDB2011] 18 Rad 17 26 13.0 +64 07 35           ~ 1 0
53 [PDB2011] 19A Rad 17 28 23.0 +64 22 18           ~ 1 0
54 [PDB2011] 19B Rad 17 28 23.0 +64 22 18           ~ 1 0
55 [PDB2011] 17 Rad 17 29 21.0 +63 54 58           ~ 1 0
56 PSR B1937+21.4 Psr 19 39 38.560096 +21 34 59.13552           ~ 1142 0
57 MCG+07-41-003 Bla 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2537 2
58 NAME Cas A SNR 23 23 26.0 +58 48 41     14.30     ~ 3033 1

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