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

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

2010A&A...514A..71V - Astronomy and Astrophysics, volume 514A71-71 (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

Full paper

View the references in ADS

Number of rows : 35

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	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	ClG J0717+3745	ClG	07 17 36.50	+37 45 23.0				~	511	0
3	B3 0714+378	Rad	07 17 36.6	+37 45 01				~	170	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				~	5	0
14	ACO 665	ClG	08 30 45.2	+65 52 55				~	457	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	4C 55.16	Bla	08 34 54.90398776	+55 34 21.0703409	20.75	19.45	17.180	~	297	2
31	[VMG2010] P	rG	08 37 44.0	+65 13 31				~	1	0
32	4C 71.07	Bla	08 41 24.36528508	+70 53 42.1730435		17.30	16.8	~	818	1
33	ACO 1656	ClG	12 59 44.40	+27 54 44.9				~	5141	2
34	3C 286	Sy1	13 31 08.2883506368	+30 30 32.960091564	17.51	17.25		~	4558	2
35	ACO 2255	ClG	17 12 56.0	+64 04 06				~	605	0

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