2017ApJ...843L..29E

Query : 2017ApJ...843L..29E

2017ApJ...843L..29E - Astrophys. J., 843, L29-L29 (2017/July-2)

On the connection between turbulent motions and particle acceleration in galaxy clusters.

ECKERT D., GASPARI M., VAZZA F., GASTALDELLO F., TRAMACERE A., ZIMMER S., ETTORI S. and PALTANI S.

Abstract (from CDS):

Giant radio halos are megaparsec-scale diffuse radio sources associated with the central regions of galaxy clusters. The most promising scenario to explain the origin of these sources is that of turbulent re-acceleration, in which MeV electrons injected throughout the formation history of galaxy clusters are accelerated to higher energies by turbulent motions mostly induced by cluster mergers. In this Letter, we use the amplitude of density fluctuations in the intracluster medium as a proxy for the turbulent velocity and apply this technique to a sample of 51 clusters with available radio data. Our results indicate a segregation in the turbulent velocity of radio halo and radio quiet clusters, with the turbulent velocity of the former being on average higher by about a factor of two. The velocity dispersion recovered with this technique correlates with the measured radio power through the relation Pradio∝σv^3.3±0.7^, which implies that the radio power is nearly proportional to the turbulent energy rate. In case turbulence cascades without being dissipated down to the particle acceleration scales, our results provide an observational confirmation of a key prediction of the turbulent re-acceleration model and possibly shed light on the origin of radio halos.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): acceleration of particles - galaxies: clusters: general - radiation mechanisms: non-thermal - radio continuum: general - turbulence - turbulence

Simbad objects: 52

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Number of rows : 52
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 2697 ClG 00 03 11.5 -06 05 30           ~ 53 0
2 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
3 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 517 0
4 BAX 006.9575+26.2739 ClG 00 27 45.90 +26 16 25.0           ~ 44 0
5 ACO 141 ClG 01 05 37.183 -24 40 49.95           ~ 87 0
6 ZwCl 0104+0048 ClG 01 06 50.5 +01 04 10           ~ 67 0
7 ACO 209 ClG 01 31 52.9 -13 36 53           ~ 326 0
8 ClG J0142+2131 ClG 01 42 03.1 +21 30 39           ~ 60 1
9 ACO 267 ClG 01 52 43.016 +00 59 58.90           ~ 241 0
10 ACO 3088 ClG 03 07 02.12 -28 39 57.3           ~ 78 0
11 PLCKESZ G171.9-40.7 ClG 03 12 55 +08 22.8           ~ 58 0
12 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
13 ACT-CL J0437.1+0043 ClG 04 37 12.0820 +00 43 37.737           ~ 47 0
14 ACT-CL J0438.9+0716 ClG 04 39 00.7 +07 15 45           ~ 62 0
15 BAX 069.7593+05.3453 ClG 04 39 02.2 +05 20 43           ~ 82 0
16 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 279 0
17 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 465 0
18 ACO 545 ClG 05 32 24.4152 -11 32 35.080           ~ 102 0
19 ClG 0657-56 ClG 06 58 26.9 -55 58 21           ~ 1077 1
20 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 511 0
21 ACO 611 ClG 08 00 58.7 +36 02 49           ~ 275 0
22 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 457 0
23 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 277 0
24 ZwCl 0857+2107 ClG 09 00 36.90 +20 53 40.3           ~ 103 0
25 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
26 ACO 773 ClG 09 17 51.3 +51 43 20           ~ 308 0
27 ACO 781 ClG 09 20 25.4 +30 30 07           ~ 167 0
28 ZwCl 0949+5207 ClG 09 52 49.1 +51 53 05           ~ 141 0
29 ZwCl 1113+0144 ClG 11 15 54.0 +01 29 44           ~ 42 0
30 ACO 1300 ClG 11 32 00.7 -19 53 34           ~ 168 0
31 MCS J1149.5+2223 ClG 11 49 35.8 +22 23 55           ~ 546 0
32 ACO 1423 ClG 11 57 17.3206 +33 36 39.364           ~ 181 0
33 ACO 1576 ClG 12 36 59.5 +63 11 18           ~ 116 0
34 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
35 ZwCl 1309+2216 ClG 13 11.5 +22 00           ~ 26 0
36 MCXC J1332.7+5032 ClG 13 32 44.8 +50 32 24           ~ 134 0
37 ACO 1914 ClG 14 25 57.4 +37 49 54           ~ 338 0
38 ACO 1995 ClG 14 52 55.0 +58 02 59           ~ 140 0
39 ACO S 780 ClG 14 59 29.1 -18 10 45           ~ 93 0
40 LEDA 1900245 Bla 15 32 53.780 +30 20 59.41   19.1   15.7 17.819 ~ 155 1
41 ACO 2146 ClG 15 56 04.7 +66 20 24           ~ 192 0
42 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 586 0
43 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 381 0
44 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
45 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
46 ACO 2261 ClG 17 22 26.9 +32 07 58           ~ 370 0
47 ACO 2319 ClG 19 21 14.0 +43 56 57           ~ 495 1
48 ACT-CL J2003.5-2323 ClG 20 03 32.3 -23 23 30           ~ 63 0
49 ACO 2537 ClG 23 08 22.3 -02 11 29           ~ 152 0
50 ACO 2631 ClG 23 37 40.7 +00 16 35           ~ 183 0
51 ACO 2645 ClG 23 41 17.0 -09 01 11           ~ 98 0
52 ACO 2667 ClG 23 51 39.37 -26 05 02.7           ~ 190 0

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