2022MNRAS.514.4969V

Query : 2022MNRAS.514.4969V

2022MNRAS.514.4969V - Mon. Not. R. Astron. Soc., 514, 4969-4981 (2022/August-3)

Puzzling large-scale polarization in the galaxy cluster Abell 523.

VACCA V., GOVONI F., MURGIA M., PERLEY R.A., FERETTI L., GIOVANNINI G., CARRETTI E., GASTALDELLO F., COVA F., MARCHEGIANI P., BATTISTELLI E., BOSCHIN W., ENSSLIN T., GIRARDI M., LOI F. and RADICONI F.

Abstract (from CDS):

Large-scale magnetic fields reveal themselves through diffuse synchrotron sources observed in galaxy clusters such as radio halos. Total intensity filaments of these sources have been observed in polarization as well, but only in three radio halos out of about 100 currently known. In this paper we analyse new polarimetric Very Large Array data of the diffuse emission in the galaxy cluster Abell 523 in the frequency range 1-2 GHz. We find for the first time evidence of polarized emission on scales of ∼2.5 Mpc. The total intensity emission is observed only in the central part of the source, likely due to observational limitations. To look for total intensity emission beyond the central region, we combine these data with single-dish observations from the Sardinia Radio Telescope and we compare them with multifrequency total intensity observations obtained with different instruments, including the LOw Frequency ARray and the Murchison Widefield Array. By analysing the rotation measure properties of the system and utilizing numerical simulations, we infer that this polarized emission is associated with filaments of the radio halo located in the outskirts of the system, in the peripheral region closest to the observer.

Abstract Copyright: © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): acceleration of particles - magnetic fields - polarization - galaxies: clusters: intracluster medium - cosmology: observations - large-scale structure of Universe

Simbad objects: 16

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Number of rows : 16
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 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
3 ACO 523 ClG 04 59 01 +08 46.5           ~ 66 0
4 [VSP2022] S4 Rad 04 59 05.4 +08 50 01           ~ 2 0
5 [VSP2022] S5 Rad 04 59 06.6 +08 43 50           ~ 2 0
6 [VSP2022] S3 Rad 04 59 08.3 +08 48 58           ~ 2 0
7 [VSP2022] S1 Rad 04 59 12.3 +08 48 04           ~ 2 0
8 [VSP2022] S2 Rad 04 59 13.0 +08 49 41           ~ 2 0
9 [VSP2022] S7 Rad 04 59 36.3 +08 47 54           ~ 2 0
10 [VSP2022] S8 Rad 04 59 36.5 +08 51 20           ~ 2 0
11 [VSP2022] S6 Rad 04 59 37.9 +08 46 01           ~ 2 0
12 QSO J0459+0229 QSO 04 59 52.05066296 +02 29 31.1765162   18.2 19     ~ 166 2
13 ICRF J052109.8+163822 Sy1 05 21 09.88596258 +16 38 22.0515459   19.37 18.84 18.480   ~ 910 1
14 ClG 0657-56 ClG 06 58 26.9 -55 58 21           ~ 1077 1
15 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 511 0
16 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0

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