2021A&A...656A.154H


Query : 2021A&A...656A.154H

2021A&A...656A.154H - Astronomy and Astrophysics, volume 656A, 154-154 (2021/12-1)

A 3.5 Mpc long radio relic in the galaxy cluster ClG 0217+70.

HOANG D.N., ZHANG X., STUARDI C., SHIMWELL T.W., BONAFEDE A., BRUGGEN M., BRUNETTI G., BOTTEON A., CASSANO R., DE GASPERIN F., DI GENNARO G., HOEFT M., INTEMA H., RAJPUROHIT K., ROTTGERING H.J.A., SIMIONESCU A. and VAN WEEREN R.J.

Abstract (from CDS):


Context. Megaparsec-scale radio sources in the form of halos and relics are often detected in dynamically disturbed galaxy clusters. Although they are associated with merger-induced turbulence and shocks, respectively, their formation is not fully understood.
Aims. We aim to identify the mechanisms responsible for particle acceleration and magnetic field amplification in the halo and relics of the galaxy cluster ClG 0217+70.
Methods. We observed ClG 0217+70 with LOFAR at 141 MHz and with VLA at 1.5 GHz, and we combined these observations with VLA 1.4 GHz archival data to study the morphological and spectral properties of the diffuse sources. We added Chandra archival data to examine the thermal and non-thermal properties of the halo.
Results. Our LOFAR and VLA data confirm the presence of a giant radio halo in the cluster centre and multiple relics in the outskirts. The radio and X-ray emission from the halo are correlated, implying a tight relation between the thermal and non-thermal components. The diffuse radio structure in the south-east, with a projected size of 3.5 Mpc, is the most extended radio relic detected to date. The spectral index across the relic width steepens towards the cluster centre, suggesting electron ageing in the post-shock regions. The shock Mach numbers for the relics derived from the spectral index map range between 2.0 and 3.2. However, the integrated spectral indices lead to increasingly high Mach numbers for the relics farther from the cluster centre. This discrepancy could be because the relation between injection and integrated spectra does not hold for distant shocks, suggesting that the cooling time for the radio-emitting electrons is longer than the crossing time of the shocks. The variations in the surface brightness of the relics and the low Mach numbers imply that the radio-emitting electrons are re-accelerated from fossil plasma that could originate in active galactic nuclei.

Abstract Copyright: © ESO 2021

Journal keyword(s): galaxies: clusters: individual: ClG 0217+70 - galaxies: clusters: intracluster medium - large-scale structure of Universe - radiation mechanisms: non-thermal - X-rays: galaxies: clusters

VizieR on-line data: <Available at CDS (J/A+A/656/A154): list.dat fits/*>

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 688 0
2 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2717 2
3 SDSS J021542.94+704832.3 G 02 15 42.94752 +70 48 32.3064           ~ 1 0
4 SDSS J021558.09+705040.1 G 02 15 58.09776 +70 50 40.1028           ~ 1 0
5 ClG 0217+70 ClG 02 17 00.0 +70 36 00           ~ 25 0
6 6C 021252+733537 BLL 02 17 30.81335327 +73 49 32.6217355     19.0 18.97   ~ 432 1
7 SDSS J021814.33+702724.0 * 02 18 14.32992 +70 27 24.0660           ~ 1 0
8 ACO 520 ClG 04 54 19.0 +02 56 49           ~ 420 0
9 ICRF J052109.8+163822 Sy1 05 21 09.88596258 +16 38 22.0515459   19.37 18.84 18.480   ~ 818 1
10 ClG J0603.3+4214 ClG 06 03.3 +42 14           ~ 117 0
11 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 901 1
12 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 443 0
13 3C 196 Sy1 08 13 36.0561170112 +48 13 02.644966020   18.36 17.79     ~ 531 2
14 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 427 0
15 ACO 3411 ClG 08 41 47.7 -17 28 46           ~ 66 0
16 ACO 781 ClG 09 20 25.4 +30 30 07           ~ 145 0
17 PLCKESZ G287.0+32.9 ClG 11 50 49.20 -28 04 36.5           ~ 69 0
18 NAME Coma C Rad 12 59.3 +27 47           ~ 57 1
19 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4599 2
20 BAX 199.3086-25.5133 ClG 13 14 31.5049 -25 15 56.602           ~ 98 0
21 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4170 2
22 ACO 2163 ClG 16 15 34.1 -06 07 26           ~ 550 0
23 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 348 0
24 3C 352 rG 17 10 44.1001 +46 01 29.834   22.8       ~ 144 1
25 ZwCl 1856+6616 ClG 18 56 40.8886 +66 22 40.463           ~ 30 0
26 NAME Sausage Cluster ClG 22 42 53.0 +53 01 05           ~ 192 0

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2023.01.30-21:49:33

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