2010A&A...514A..71V


Query : 2010A&A...514A..71V

2010A&A...514A..71V - Astronomy and Astrophysics, volume 514, A71-71 (2010/5-1)

The intracluster magnetic field power spectrum in Abell 665.

VACCA V., MURGIA M., GOVONI F., FERETTI L., GIOVANNINI G., ORRU E. and BONAFEDE A.

Abstract (from CDS):

The goal of this work is to investigate the power spectrum of the magnetic field associated with the giant radio halo in the galaxy cluster A665. For this, we present new deep Very Large Array total intensity and polarization observations at 1.4GHz. We simulated Gaussian random three-dimensional turbulent magnetic field models to reproduce the observed radio halo emission. By comparing observed and synthetic radio halo images we constrained the strength and structure of the intracluster magnetic field. We assumed that the magnetic field power spectrum is a power law with a Kolmogorov index and we imposed a local equipartition of energy density between relativistic particles and field. Under these assumptions, we find that the radio halo emission in A665 is consistent with a central magnetic field strength of about 1.3µG. To explain the azimuthally averaged radio brightness profile, the magnetic field energy density should decrease following the thermal gas density, leading to an averaged magnetic field strength over the central 1Mpc3 of about 0.75µG. From the observed brightness fluctuations of the radio halo, we infer that the outer scale of the magnetic field power spectrum is ∼450kpc, and the corresponding magnetic field auto-correlation length is ∼100kpc.

Abstract Copyright:

Journal keyword(s): galaxies: cluster: general - galaxies: cluster: individual: A665 - large-scale structure of Universe - magnetic fields

Nomenclature: Fig. 6, Table 3: [VMG2010] A (Nos A-Z).

Simbad objects: 35

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Number of rows : 35
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2673 2
2 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 417 0
3 B3 0714+378 Rad 07 17 36.50 +37 45 23.0           ~ 169 2
4 [VV2006] J082656.9+654232 QSO 08 26 56.9135 +65 42 31.924           ~ 5 0
5 [VMG2010] H rG 08 28 34.0 +66 02 17           ~ 1 0
6 [VMG2010] U rG 08 28 51.0 +65 54 36           ~ 1 0
7 [VMG2010] V AGN 08 29 28.0 +65 49 08           ~ 2 0
8 [VMG2010] D rG 08 29 51.0 +65 51 53           ~ 1 0
9 LEDA 2684876 rG 08 30 03.8 +66 13 09           ~ 2 0
10 [VMG2010] Y rG 08 30 09.0 +65 34 57           ~ 1 0
11 [VMG2010] E rG 08 30 25.0 +65 50 42           ~ 1 0
12 [VMG2010] R rG 08 30 34.0 +65 51 54           ~ 1 0
13 2MASX J08304161+6558102 rG 08 30 41.6361447504 +65 58 10.602213888           ~ 4 0
14 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 416 0
15 [VMG2010] B rG 08 30 53.0 +65 37 00           ~ 1 0
16 [VMG2010] X rG 08 31 08.0 +65 35 39           ~ 1 0
17 [VMG2010] Z rG 08 31 16.0 +65 47 30           ~ 1 0
18 NVSS J083130+655236 rG 08 31 31.0 +65 52 36           ~ 3 0
19 [VMG2010] G rG 08 31 40.0 +65 52 33           ~ 1 0
20 [VMG2010] S rG 08 31 52.0 +65 54 53           ~ 1 0
21 [VMG2010] F rG 08 32 02.0 +65 50 38           ~ 1 0
22 [VMG2010] I rG 08 32 17.0 +66 00 50           ~ 1 0
23 [VMG2010] W rG 08 32 26.0 +65 34 28           ~ 1 0
24 [VMG2010] T rG 08 32 44.0 +65 50 15           ~ 1 0
25 [VMG2010] O rG 08 33 11.0 +65 58 02           ~ 1 0
26 [VMG2010] A rG 08 33 12.0 +65 50 41           ~ 1 0
27 [VMG2010] L rG 08 33 34.0 +65 37 01           ~ 1 0
28 [VMG2010] N rG 08 34 13.0 +65 45 25           ~ 1 0
29 [VMG2010] Q rG 08 34 14.0 +66 35 52           ~ 1 0
30 ICRF J083454.9+553421 Sy2 08 34 54.9022011432 +55 34 21.085082256   20.75 19.45 17.180   ~ 266 2
31 [VMG2010] P rG 08 37 44.0 +65 13 31           ~ 1 0
32 4C 71.07 QSO 08 41 24.3652863600 +70 53 42.171665460     16.5 16.8   ~ 727 1
33 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4501 2
34 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4059 2
35 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 530 0

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2022.05.22-12:12:44

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