2022MNRAS.511.3389V

Query : 2022MNRAS.511.3389V

2022MNRAS.511.3389V - Mon. Not. R. Astron. Soc., 511, 3389-3407 (2022/April-2)

Spectral study of the diffuse synchrotron source in the galaxy cluster Abell 523.

VACCA V., SHIMWELL T., PERLEY R.A., GOVONI F., MURGIA M., FERETTI L., GIOVANNINI G., LOI F., CARRETTI E., COVA F., GASTALDELLO F., GIRARDI M., ENSSLIN T., AKAMATSU H., BONAFEDE A., BONNASSIEUX E., BOSCHIN W., BOTTEON A., BRUNETTI G., BRUGGEN M., FINOGUENOV A., HOANG D., IACOBELLI M., ORRU E., PALADINO R., ROTTGERING H., VAN WEEREN R., VITELLO F. and WITTOR D.

Abstract (from CDS):

The galaxy cluster Abell 523 (A523) hosts an extended diffuse synchrotron source historically classified as a radio halo. Its radio power at 1.4 GHz makes it one of the most significant outliers in the scaling relations between observables derived from multiwavelength observations of galaxy clusters: it has a morphology that is different and offset from the thermal gas, and it has polarized emission at 1.4 GHz typically difficult to observe for this class of sources. A magnetic field fluctuating on large spatial scales (∼1 Mpc) can explain these peculiarities but the formation mechanism for this source is not yet completely clear. To investigate its formation mechanism, we present new observations obtained with the LOw Frequency ARray at 120-168 MHz and the Jansky Very Large Array at 1-2 GHz, which allow us to study the spectral index distribution of this source. According to our data the source is observed to be more extended at 144 MHz than previously inferred at 1.4 GHz, with a total size of about 1.8 Mpc and a flux density S_144 MHz_=(1.52±0.31) Jy. The spectral index distribution of the source is patchy with an average spectral index α ∼ 1.2 between 144 MHz and 1.410 GHz, while an integrated spectral index α∼2.1 has been obtained between 1.410 and 1.782 GHz. A previously unseen patch of steep spectrum emission is clearly detected at 144 MHz in the south of the cluster. Overall, our findings suggest that we are observing an overlapping of different structures, powered by the turbulence associated with the primary and a possible secondary merger.

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 - galaxies: clusters: intracluster medium - cosmology: observations - large-scale structure of Universe

Nomenclature: Figs 1-2, Table 3: [VSP2022] SNN (Nos S1-S10), [VSP2022] FN (Nos F1-F3), [VSP2022] P N=1.

Simbad objects: 34

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Number of rows : 34
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 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
2 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
3 ClG 0217+70 ClG 02 17 00.0 +70 36 00           ~ 40 0
4 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
5 ACO 515 ClG 04 49 34 +06 10.1           ~ 11 0
6 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 465 0
7 [VSP2022] S9 Rad 04 58 49.9 +08 44 46           ~ 1 0
8 [VSP2022] S10 Rad 04 58 53.6 +08 43 41           ~ 1 0
9 ACO 523 ClG 04 59 01 +08 46.5           ~ 66 0
10 [VSP2022] P Rad 04 59 04.0 +08 41 21           ~ 1 0
11 [VSP2022] S4 Rad 04 59 05.4 +08 50 01           ~ 2 0
12 [VSP2022] S5 Rad 04 59 06.6 +08 43 50           ~ 2 0
13 [VSP2022] S3 Rad 04 59 08.3 +08 48 58           ~ 2 0
14 [GBG2016] 68 G 04 59 11.3217733245 +08 48 12.625596885           ~ 3 0
15 [VSP2022] S1 Rad 04 59 12.3 +08 48 04           ~ 2 0
16 [VSP2022] S2 Rad 04 59 13.0 +08 49 41           ~ 2 0
17 ACO 525 ClG 04 59 30 +08 08.5           ~ 10 0
18 [VSP2022] S7 Rad 04 59 36.3 +08 47 54           ~ 2 0
19 [VSP2022] S8 Rad 04 59 36.5 +08 51 20           ~ 2 0
20 [VSP2022] S6 Rad 04 59 37.9 +08 46 01           ~ 2 0
21 QSO J0459+0229 QSO 04 59 52.05066296 +02 29 31.1765162   18.2 19     ~ 166 2
22 SCl 62 SCG 04 59.9 +08 34           ~ 5 0
23 ACO 529 ClG 05 00 40 +06 10.4           ~ 10 0
24 ACO 532 ClG 05 03 11 +11 57.2           ~ 10 0
25 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1573 1
26 ClG J0603.3+4214 ClG 06 03.3 +42 14           ~ 141 0
27 ClG 0657-56 ClG 06 58 26.9 -55 58 21           ~ 1077 1
28 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 511 0
29 3C 196 Sy1 08 13 36.0561170112 +48 13 02.644966020   18.36 17.79     ~ 578 2
30 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 910 0
31 ACO 1213 ClG 11 16 26.98 +29 16 23.9           ~ 155 0
32 NAME Coma C Rad 12 59.3 +27 47           ~ 58 1
33 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
34 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0

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