2015MNRAS.453.3483D

Query : 2015MNRAS.453.3483D

2015MNRAS.453.3483D - Mon. Not. R. Astron. Soc., 453, 3483-3498 (2015/November-2)

A powerful double radio relic system discovered in PSZ1 G108.18-11.53: evidence for a shock with non-uniform Mach number?

DE GASPERIN F., INTEMA H.T., VAN WEEREN R.J., DAWSON W.A., GOLOVICH N., WITTMAN D., BONAFEDE A. and BRUGGEN M.

Abstract (from CDS):

Diffuse radio emission in the form of radio haloes and relics has been found in a number of merging galaxy clusters. These structures indicate that shock and turbulence associated with the merger accelerate electrons to relativistic energies. We report the discovery of a radio relic + radio halo system in PSZ1 G108.18-11.53 (z = 0.335). This cluster hosts the second most powerful double radio relic system ever discovered. We observed PSZ1 G108.18-11.53 with the Giant Meterwave Radio Telescope and the Westerbork Synthesis Radio Telescope. We obtained radio maps at 147, 323, 607 and 1380 MHz. We also observed the cluster with the Keck telescope, obtaining the spectroscopic redshift for 42 cluster members. From the injection index, we obtained the Mach number of the shocks generating the two radio relics. For the southern shock, we found M= 2.33^+0.19_-0.26, while the northern shock Mach number goes from M= 2.20^+0.07_-0.14 in the north part down to M= 2.00^+0.03_-0.08 in the southern region. If the relation between the injection index and the Mach number predicted by diffusive shock acceleration theory holds, this is the first observational evidence for a gradient in the Mach number along a galaxy cluster merger shock.

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

Journal keyword(s): galaxies: clusters: individual: PSZ1 G108.18-11.53 - large-scale structure of Universe - radio continuum: general

Nomenclature: Table 3: [DIV2015] Relic W (Nos N and S). Table 4: [DIV2015] RGN (Nos RG1-RG5, RG7), [DIV2015] RG6 core N=1, [DIV2015] RG6 lobe W (Nos N and S).

Simbad objects: 25

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Number of rows : 25
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 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
2 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 279 0
3 NVSS J051932+505432 Rad 05 19 32.52342480 +50 54 31.2300360           ~ 44 1
4 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1573 1
5 ClG J0603.3+4214 ClG 06 03.3 +42 14           ~ 141 0
6 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
7 MCS J1149.5+2223 ClG 11 49 35.8 +22 23 55           ~ 546 0
8 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
9 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
10 MCS J1752.0+4440 ClG 17 52 02.2 +44 40 38           ~ 68 0
11 CIZA J2242.8+5301 ClG 22 42 53.0 +53 01 05           ~ 228 0
12 NVSS J232121+482744 Rad 23 21 21.6026215032 +48 27 43.749931536           ~ 3 1
13 [DIV2015] RG7 rG 23 21 22.0 +48 27 43           ~ 1 0
14 [DIV2015] RG3 rG 23 21 24.0 +48 51 16           ~ 1 0
15 [DIV2015] RG6 lobe S rG 23 21 36.0 +48 28 32           ~ 1 0
16 [DIV2015] RG6 core rG 23 21 46.0 +48 29 48           ~ 1 0
17 [DIV2015] RG6 lobe N rG 23 21 48.0 +48 31 11           ~ 1 0
18 [DIV2015] RG2 rG 23 21 51.0 +48 50 23           ~ 1 0
19 [DIV2015] Relic N Rad 23 22 10.0 +48 40 30           ~ 2 0
20 [DIV2015] RG4 rG 23 22 27.0 +48 43 22           ~ 1 0
21 [DIV2015] RG5 rG 23 22 28.0 +48 41 25           ~ 1 0
22 PSZ1 G108.18-11.53 ClG 23 22 28.2499 +48 44 29.172           ~ 36 0
23 [DIV2015] Relic S Rad 23 22 50.0 +48 49 30           ~ 2 0
24 NVSS J232307+490540 Rad 23 23 07.4898879168 +49 05 39.051134448           ~ 3 1
25 [DIV2015] RG1 rG 23 23 08.0 +49 05 39           ~ 1 0

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