2009A&A...503..707B

Query : 2009A&A...503..707B

2009A&A...503..707B - Astronomy and Astrophysics, volume 503, 707-720 (2009/9-1)

Revealing the magnetic field in a distant galaxy cluster: discovery of the complex radio emission from MACS J0717.5 +3745.

BONAFEDE A., FERETTI L., GIOVANNINI G., GOVONI F., MURGIA M., TAYLOR G.B., EBELING H., ALLEN S., GENTILE G. and PIHLSTROEM Y.

Abstract (from CDS):

To study at multiple frequencies the radio emission arising from the massive galaxy cluster MACSJ0717.5+3745 (z=0.55). Known to be an extremely complex cluster merger, the system is uniquely suited for an investigation of the phenomena at work in the intra-cluster medium (ICM) during cluster collisions. We use multi-frequency and multi-resolution data obtained with the Very Large Array radio telescope, and X-ray features revealed by Chandra, to probe the non-thermal and thermal components of the ICM, their relations and interactions. The cluster shows highly complex radio emission. A bright, giant radio halo is detected at frequencies as high as 4.8GHz. MACSJ0717.5+3745 is the most distant cluster currently known to host a radio halo. This radio halo is also the most powerful ever observed, and the second case for which polarized radio emission has been detected, indicating that the magnetic field is ordered on large scales.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: MACSJ0717+3745 - radiation mechanisms: non-thermal - polarization - magnetic fields

Nomenclature: Table 2, Fig. 1-2: [BFG2009] A (Nos A-C, F).

Simbad objects: 22

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Number of rows : 22
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 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 811 0
2 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 502 0
3 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2814 2
4 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 249 0
5 ICRF J052109.8+163822 Sy1 05 21 09.88596258 +16 38 22.0515459   19.37 18.84 18.480   ~ 851 1
6 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1493 1
7 QSO B0710+439 QSO 07 13 38.16413557 +43 49 17.2072102   20.7       ~ 244 0
8 7C 071105.79+353949.00 QSO 07 14 24.81748958 +35 34 39.7954831     17 17.7   ~ 209 1
9 [BFG2009] A rG 07 17 35.4 +37 45 08           ~ 2 0
10 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 463 0
11 B3 0714+378 Rad 07 17 36.6 +37 45 01           ~ 170 2
12 [BFG2009] F rG 07 17 39.0 +37 44 30           ~ 2 0
13 [BFG2009] B rG 07 17 40.9 +37 43 17           ~ 2 0
14 NVSS J071753+374209 rG 07 17 53.506 +37 42 09.28           ~ 4 0
15 ICRF J074110.7+311200 Sy1 07 41 10.70330407 +31 12 00.2291151   17.02 16.89 16.322   ~ 450 1
16 ACO 1240 ClG 11 23 37.7 +43 03 28           ~ 98 0
17 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4341 2
18 ACO 2256 ClG 17 03 09.4 +78 39 36           ~ 885 1
19 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 568 0
20 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 627 1
21 ACO 2345 ClG 21 27 05.391 -12 09 07.41           ~ 131 0
22 NVSS J212709-120958 Rad 21 27 09.5 -12 09 58           ~ 132 1

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