2015MNRAS.451.4021S

Query : 2015MNRAS.451.4021S

2015MNRAS.451.4021S - Mon. Not. R. Astron. Soc., 451, 4021-4028 (2015/August-3)

KAT-7 detection of radio halo emission in the Triangulum Australis galaxy cluster.

SCAIFE A.M.M., OOZEER N., DE GASPERIN F., BRUGGEN M., TASSE C. and MAGNUS L.

Abstract (from CDS):

We report the presence of high significance diffuse radio emission from the Triangulum Australis cluster using observations made with the KAT-7 telescope and propose that this emission is a giant radio halo. We compare the radio power from this proposed halo with X-ray and SZ (Sunyaev-Zel'dovich) measurements and demonstrate that it is consistent with the established scaling relations for cluster haloes. By combining the X-ray and SZ data we calculate the ratio of non-thermal to thermal electron pressure within Triangulum Australis to be X = 0.658±0.054. We use this ratio to constrain the maximum magnetic field strength within the halo region to be Bmax, halo = 33.08µG and compare this with the minimum field strength from equipartition of Bmin, halo = 0.77(1 + k)2/7µG to place limits on the range of allowed magnetic field strength within this cluster. We compare these values to those for more well-studied systems and discuss these results in the context of equipartition of non-thermal energy densities within clusters of galaxies.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): galaxies: clusters: individual: Triangulum Australis - galaxies: clusters: intracluster medium

Nomenclature: Table 1: [SOD2015] NN (Nos 1-18).

Simbad objects: 31

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Number of rows : 31
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 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
2 SUMSS J163309-642322 Rad 16 33 09.09 -64 23 22.3           ~ 1 0
3 [SOD2015] 1 Rad 16 33 13.2 -64 23 00           ~ 1 0
4 SUMSS J163317-642157 Rad 16 33 17.96 -64 21 57.7           ~ 1 0
5 [SOD2015] 2 Rad 16 33 27.43 -64 28 32.8           ~ 1 0
6 [SOD2015] 3 Rad 16 33 31.14 -64 08 05.7           ~ 1 0
7 [SOD2015] 4 Rad 16 34 34.98 -64 40 40.1           ~ 1 0
8 [SOD2015] 5 Rad 16 34 53.88 -64 14 20.0           ~ 1 0
9 PMN J1634-6358 Rad 16 34 58.0 -63 58 38           ~ 2 1
10 [SOD2015] 6 Rad 16 35 01.1 -63 58 44           ~ 1 0
11 SUMSS J163523-640040 Rad 16 35 23.71 -64 00 40.5           ~ 1 0
12 [SOD2015] 7 Rad 16 36 29.64 -64 35 15.9           ~ 1 0
13 PMN J1636-6508 Rad 16 36 52.4 -65 08 09           ~ 2 1
14 SUMSS J163751-650414 Rad 16 37 51.39 -65 04 14.4           ~ 1 0
15 SUMSS J163808-650409 Rad 16 38 08.20 -65 04 09.3           ~ 1 0
16 [SOD2015] 9 Rad 16 38 10.5 -65 04 29           ~ 1 0
17 BAX 249.5848-64.5165 ClG 16 38 13.2 -64 21 21           ~ 123 0
18 [SOD2015] 10 Rad 16 38 16.57 -63 55 36.8           ~ 1 0
19 [SOD2015] 11 Rad 16 38 30.35 -64 40 43.4           ~ 1 0
20 SUMSS J163903-650513 Rad 16 39 03.26 -65 05 13.1           ~ 1 0
21 [SOD2015] 12 Rad 16 39 07.5 -65 07 20           ~ 1 0
22 SUMSS J163913-650804 Rad 16 39 13.18 -65 08 04.3           ~ 1 0
23 [SOD2015] 13 Rad 16 39 24.10 -64 05 20.1           ~ 1 0
24 SUMSS J164000-642639 Rad 16 40 00.51 -64 26 39.2           ~ 1 0
25 [SOD2015] 14 Rad 16 40 05.5 -64 26 42           ~ 1 0
26 [SOD2015] 15 Rad 16 40 33.63 -65 05 29.8           ~ 1 0
27 PMN J1641-6433 Rad 16 41 44.77 -64 34 06.8           ~ 4 1
28 [SOD2015] 17 Rad 16 42 39.25 -64 20 50.2           ~ 1 0
29 PMN J1643-6440 Rad 16 43 54.7 -64 40 19           ~ 2 1
30 NGC 6328 QSO 17 23 41.02933859 -65 00 36.6106377   13.17 13.2 11.45 12.2 ~ 270 1
31 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2

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