2013MNRAS.433.3208B

Query : 2013MNRAS.433.3208B

2013MNRAS.433.3208B - Mon. Not. R. Astron. Soc., 433, 3208-3226 (2013/August-3)

Measurements and simulation of Faraday rotation across the Coma radio relic.

BONAFEDE A., VAZZA F., BRUGGEN M., MURGIA M., GOVONI F., FERETTI L., GIOVANNINI G. and OGREAN G.

Abstract (from CDS):

The aim of this work is to probe the magnetic field properties in relics and infall regions of galaxy clusters using Faraday rotation measures. We present Very Large Array multifrequency observations of seven sources in the region south-west of the Coma cluster, where the infalling group NGC 4839 and the relic 1253+275 are located. The Faraday rotation measure maps for the observed sources are derived and analysed to study the magnetic field in the south-west region of Coma. We discuss how to interpret the data by comparing observed and mock rotation measure maps that are produced simulating different three-dimensional magnetic field models. The magnetic field model that gives the best fit to the Coma central region underestimates the rotation measure in the south-west region by a factor of ∼ 6, and no significant jump in the rotation measure data is found at the position of the relic. We explore different possibilities to reconcile observed and mock rotation measure trends, and conclude that an amplification of the magnetic field along the south-west sector is the most plausible solution. Our data together with recent X-ray estimates of the gas density obtained with Suzaku suggest that a magnetic field amplification by a factor of ∼ 3 is required throughout the entire south-west region in order to reconcile real and mock rotation measure trends. The magnetic field in the relic region is inferred to be ∼ 2µG, consistent with inverse Compton limits.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): magnetic fields - radiation mechanism: non-thermal - methods: observational - methods: numerical - galaxies: clusters: individual (Coma, Abell 1656) - galaxies: groups: individual: NGC4839

Simbad objects: 30

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Number of rows : 30
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 520 ClG 04 54 10.1 +02 55 38           ~ 465 0
2 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 334 0
3 ClG 0657-56 ClG 06 58 26.9 -55 58 21           ~ 1077 1
4 NGC 2484 Sy2 07 58 28.10812817 +37 47 11.8076475   14.15 14.9     ~ 284 1
5 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
6 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1274 0
7 [K94] 125135.60+272011.9 Rad 12 54 01.2 +27 03 28           ~ 5 0
8 NGC 4789 rG 12 54 19.0044627120 +27 04 05.008348776   13.12 12.10     ~ 139 2
9 [K94] 125232.35+273124.9 Rad 12 54 58.1 +27 14 51           ~ 9 0
10 NVSS J125458+271512 rG 12 54 58.22760 +27 15 13.5320           ~ 7 1
11 NAME Coma Relic Rad 12 55 +27.2           ~ 59 0
12 [K94] 125254.31+273025.7 Rad 12 55 21.0 +27 14 44           ~ 11 0
13 [K94] 125317.48+273302.1 Rad 12 55 43.3 +27 16 33           ~ 11 0
14 NVSS J125638+281642 Rad 12 56 38.06 +28 16 42.8   20.9       ~ 18 1
15 NGC 4827 LIN 12 56 43.5187101000 +27 10 43.654438128   13.90 12.91     ~ 125 1
16 NAME NGC 4839 Group GrG 12 57 21.5 +27 31 54           ~ 86 0
17 NGC 4839 BiC 12 57 24.3563164776 +27 29 52.203087132 13.56 13.02 12.06     ~ 482 3
18 [K94] 125634.42+280256.8 Rad 12 58 59.3 +27 46 51           ~ 14 0
19 NGC 4869 EmG 12 59 23.3588349024 +27 54 41.731884360 15.03 14.9 13.52 13.292 12.536 ~ 286 0
20 NGC 4874 LIN 12 59 35.7093764280 +27 57 33.293892204 13.01 13.7 12.71 12.27 11.386 ~ 814 3
21 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
22 [K94] 125826.10+282411.5 Rad 13 00 50.86224 +28 08 04.0632           ~ 14 0
23 US 142 QSO 13 01 20.1239726520 +28 21 37.239778620   19.45 19.40     ~ 70 2
24 5C 4.152 QSO 13 03 14.2681235592 +27 30 12.637157760           ~ 18 1
25 US 371 BLL 13 10 28.66385420 +32 20 43.7828340   15.61 15.24 17.91   ~ 917 1
26 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
27 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
28 ACO 2146 ClG 15 56 04.7 +66 20 24           ~ 192 0
29 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 676 1
30 CIZA J2242.8+5301 ClG 22 42 53.0 +53 01 05           ~ 228 0

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