2004A&A...424..429M


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.16CEST01:06:25

2004A&A...424..429M - Astronomy and Astrophysics, volume 424, 429-446 (2004/9-3)

Magnetic fields and Faraday rotation in clusters of galaxies.

MURGIA M., GOVONI F., FERETTI L., GIOVANNINI G., DALLACASA D., FANTI R., TAYLOR G.B. and DOLAG K.

Abstract (from CDS):

We present a numerical approach to investigate the relationship between magnetic fields and Faraday rotation effects in clusters of galaxies. We can infer the structure and strength of intra-cluster magnetic fields by comparing our simulations with the observed polarization properties of extended cluster radio sources such as radio galaxies and halos. We find the observations require a magnetic field which fluctuates over a wide range of spatial scales (at least one order of magnitude). If several polarized radio sources are located at different projected positions in a galaxy cluster, as is the case for A119, detailed Faraday rotation images allow us to constrain both the magnetic field strength and the slope of the power spectrum. Our results show that the standard analytic expressions applied in the literature overestimate the cluster magnetic field strengths by a factor of ∼2. We investigate the possible effects of our models on beam depolarization of radio sources whose radiation traverses the magnetized intracluster medium. Finally, we point out that radio halos may provide important information about the spatial power spectrum of the magnetic field fluctuations on large scales. In particular, different values of the index of the power spectrum produce very different total intensity and polarization brightness distributions.

Abstract Copyright:

Journal keyword(s): magnetic fields - galaxies: clusters: general

CDS comments: Table 2 : PKS 0405-203 is a misprint for PKS 0445-203.

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 4C -01.04 GiC 00 56 02.697 -01 20 03.77   16.4       ~ 89 0
2 ACO 119 ClG 00 56 16.8 -01 15 00           ~ 509 2
3 PKS 0053-015 rG 00 56 25.587 -01 15 44.98   14.9       ~ 73 0
4 UGC 595 AGN 00 57 34.920 -01 23 27.89   14.07 15.10     ~ 225 1
5 ZwCl 0056+2636 ClG 00 59.6 +26 52           ~ 9 0
6 ACO 400 ClG 02 57 37.4 +06 00 45           ~ 380 3
7 3C 75 PaG 02 57 41.64 +06 01 28.0           ~ 279 1
8 [OWG93] ACO 0514-F GiC 04 47 13.11 -20 14 01.0     18.5     ~ 9 1
9 ACO 514 ClG 04 47 40.0 -20 25 44           ~ 134 0
10 PKS 0446-206 rG 04 48 30.588 -20 32 13.85   16.86   15.36   ~ 30 1
11 3C 129 rG 04 49 09.064 +45 00 39.40   19       ~ 242 2
12 RXC J0450.0+4501 ClG 04 50 03.5 +45 01 27           ~ 35 1
13 LEDA 16124 G 04 50 06.685 +45 03 05.74   19       ~ 62 1
14 NGC 4869 rG 12 59 23.331 +27 54 41.81 15.03 14.9 13.52 13.292 12.536 ~ 257 0
15 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4095 2
16 2MASXI J1712231+640156 rG 17 12 19.7 +64 01 25   17.6       ~ 18 0
17 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 492 0
18 NVSS J171329+640250 rG 17 13 29.033 +64 02 49.00           ~ 35 2
19 UGC 12064 AGN 22 31 20.625 +39 21 29.81   14.6       ~ 414 1
20 NAME 3C 449 Cluster ClG 22 32 +39.4           ~ 6 0
21 ACO 2634 ClG 23 38 18.4 +27 01 37           ~ 474 2
22 NGC 7720 Sy1 23 38 29.38322439 +27 01 53.2583763   13.9 13.3     ~ 507 4
23 [MPD2001] E Wing PoG ~ ~           ~ 2 0
24 [MPD2001] W Wing PoG ~ ~           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2019.10.16-01:06:25

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